[apops] Cisco Security Advisory: Cisco IOS Virtual Private Dial-up Netwo

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Virtual Private Dial-up Network Denial of Service Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 26 Mar 2008 17:00:00 +0100
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      Cisco Security Advisory: Cisco IOS Virtual Private Dial-up Network
                               Denial of Service Vulnerability
      
      Advisory ID: cisco-sa-20080326-pptp
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
      
      Revision 1.0
      
      For Public Release 2008 March 26 1600 UTC (GMT)
      
      Summary
      =======
      
      Two vulnerabilities exist in the virtual private dial-up network
      (VPDN) solution when Point-to-Point Tunneling Protocol (PPTP) is used
      in certain Cisco IOS releases prior to 12.3. PPTP is only one of the
      supported tunneling protocols used to tunnel PPP frames within the
      VPDN solution.
      
      The first vulnerability is a memory leak that occurs as a result of
      PPTP session termination. The second vulnerability may consume all
      interface descriptor blocks on the affected device because those
      devices will not reuse virtual access interfaces. If these
      vulnerabilities are repeatedly exploited, the memory and/or interface
      resources of the attacked device may be depleted.
      
      Cisco has made free software available to address these vulnerabilities
      for affected customers.
      
      There are no workarounds available to mitigate the effects of these
      vulnerabilities.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
      
      Note: The March 26, 2008 publication includes five security
      advisories. The advisories all address vulnerabilities in Cisco's
      Internetwork Operating System (IOS) software. Each advisory lists the
      releases that correct the vulnerability described in the advisory,
      and also lists the releases that correct the vulnerabilities in the
      other five advisories. Please reference the following software table
      to find a release that fixes all published software advisories as of
      March 26th, 2008:
      
        * March 26th Bundled IOS Advisory Table
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-bundle.shtml
      
      Individual publication links are listed below:
      
        * Cisco IOS Virtual Private Dial-up Network Denial of Service
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
         
        * Multiple DLSw Denial of Service Vulnerabilities in Cisco IOS
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
         
        * Cisco IOS User Datagram Protocol Delivery Issue For IPv4/IPv6
          Dual-stack Routers
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
         
        * Vulnerability in Cisco IOS with OSPF, MPLS VPN, and Supervisor
          32, Supervisor 720, or Route Switch Processor 720
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-queue.shtml
         
        * Cisco IOS Multicast Virtual Private Network (MVPN) Data Leak
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
         
      
      Affected Products
      =================
      
      Devices that are running certain Cisco IOS versions prior to 12.3
      with VPDN enabled may be affected by these vulnerabilities.
      
      Vulnerable Products
      +------------------
      
      Devices that are running affected versions of Cisco IOS with VPDN
      enabled and are configured to accept termination of PPTP sessions are
      vulnerable.
      
      To determine whether VPDN is enabled on your device, log in to the
      device and issue the command-line interface (CLI) command "show
      running-config". If the output contains "vpdn enable" along with a 
      "vpdn-group <name>" command, VPDN is enabled on the device. The device
      will accept termination of PPTP sessions if the command "protocol any"
      or "protocol pptp" is defined under the "vpdn-group <name>" command. 
      The following example shows a device that is running VPDN and will 
      accept termination of PPTP sessions:
      
          Router#show running-config 
          Building configuration...
          
          !
          !--- Output truncated.
          !
          
          vpdn enable
          
          !
          
          vpdn-group test_only
          ! Default PPTP VPDN group
           accept-dialin
            protocol pptp
            virtual-template 1
          
          !
          !---Remaining output truncated.
          
      
      To determine the software version running on a Cisco product, log in
      to the device and issue the "show version" command to display the
      system banner. Cisco IOS software will identify itself as
      "Internetwork Operating System Software" or simply "IOS." On the next
      line of output, the image name will be displayed between parentheses,
      followed by "Version" and the IOS release name. Other Cisco devices
      will not have the "show version" command or will give different output.
      
      The following example identifies a Cisco product that is running
      Cisco IOS release 12.2(7):
      
          Cisco Internetwork Operating System Software 
          IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(7), RELEASE SOFTWARE (fc1)
          Copyright (c) 1986-2002 by cisco Systems, Inc.
          Compiled Tue 15-Jan-02 18:31 by pwade
          Image text-base: 0x600089C0, data-base: 0x613A6000
      
      Additional information about Cisco IOS release naming can be found at
      http://www.cisco.com/warp/public/620/1.html.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Devices that are running Cisco IOS versions 12.3 and later are not
      affected by these vulnerabilities. Devices that are explicitly
      configured for VPDN protocols other than PPTP are not affected.
      
      Devices that are running Cisco IOS versions prior to 12.3 and do not
      have VPDN enabled are not affected by these vulnerabilities.
      
      Cisco IOS XR is not affected by these vulnerabilities.
      
      Details
      =======
      
      VPDNs securely carry private data over a public network, allowing
      remote users to access a private network over a shared infrastructure
      such as the Internet. VPDNs maintain the same security and management
      policies as a private network, while providing a cost-effective
      method for point-to-point connections between remote users and a
      central network.
      
      PPTP is a network protocol that enables the secure transfer of data
      from a remote client to a private enterprise server by creating a
      VPDN across TCP/IP-based data networks. PPTP supports on-demand,
      multiprotocol, virtual private networking over public networks, such
      as the Internet.
      
      Details regarding the two known vulnerabilities in Cisco IOS devices
      that are running affected versions of system software follow:
      
        * Memory Leak due to PPTP Session Termination
      
          Upon completion of a PPTP session, memory is leaked from the
          processor memory on the terminating device. This is shown in the
          output of "show process memory" under the *Dead* process. The 
          *Dead* process is not a real process. Its function is to account 
          for the memory that is allocated under the context of another 
          process which has terminated, in this case PPTP. When the 
          administrator is logged into the device, if the device is under 
          exploitation, the Holding entry of the *Dead* process under the 
          "show process memory" command will be increasing. Following is 
          an example showing a device that is holding *Dead* memory:
         
              Router#show process memory 
              Total: 199718560, Used: 11147828, Free: 188570732
               PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
                 0   0      99812       1848    8415816          0          0 *Init*          
                 0   0        444     778840        444          0          0 *Sched*         
                 0   0   17481700    4930848     819672     180908          0 *Dead*          
                 1   0        284        284       3828          0          0 Load Meter 
              
              !--- Output truncated.
              
          The CLI command "show memory dead" allows administrators to examine
          the contents of *Dead*. The output will display many occurrences
          of PPTP in the output if the PPTP process is causing the leak.
          The following example shows the dead memory for a device that has
          been exploited by the vulnerability
         
              Router#show memory dead
                              Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
              Processor   6225FF40   224002240    11906736   212095504   212082872   212084464
                    I/O   20000000    33554440      994136    32560304    32560304    32560252
                  I/O-2    F800000     8388616     1020632     7367984     7367984     7367932
              
      
                        Processor memory
              
               Address      Bytes     Prev     Next Ref    PrevF   NextF Alloc PC  what
              62275DC8 0000000048 62275D68 62275E24 001  ------- ------- 60654230  PPTP create idb
              62275E24 0000000052 62275DC8 62275E84 001  ------- ------- 60654230  PPTP create idb
              62275E84 0000000052 62275E24 62275EE4 001  ------- ------- 60654230  PPTP create idb
              ....
              
              !--- remaining output truncated.
              
          This vulnerability is documented in Cisco bug ID CSCsj58566 
          and Common Vulnerabilities and Exposures (CVE) identifier 
          CVE-2008-1151 has been assigned to this vulnerability.
      
        * Virtual Access Interfaces Are Not Re-used
      
          Upon completion of a PPTP session, affected devices do not remove
          the virtual access interface that is associated with the PPTP
          session and do not reuse the interfaces in any future
          connections.
      
          This situation can result in an exhaustion of the interface
          descriptor block (IDB) limit, which will prevent any new
          interfaces being created within Cisco IOS, effectively blocking
          all new VPDN connections, even though the router may still have
          enough processor memory to remain up and running. A reload of the
          device is required to remove the interfaces.
      
          An IDB is a Cisco IOS internal data structure that contains
          information such as the IP address, interface state, and packet
          statistics. Cisco IOS software maintains one IDB for each
          interface present on a platform and one IDB for each
          subinterface.
      
          Further documentation on Cisco IOS IDBs can be found at: 
          http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_tech_note09186a0080094322.shtml
          This vulnerability is documented in Cisco bug ID CSCdv59309 
          and Common Vulnerabilities and Exposures (CVE) identifier 
          CVE-2008-1150 has been assigned to this vulnerability.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco is providing scores for the vulnerabilities in this advisory
      based on the Common Vulnerability Scoring System (CVSS). The CVSS
      scoring in this Security Advisory is done in accordance with CVSS
      version 2.0.
      
      Cisco will provide a base and temporal score. Customers can then
      compute environmental scores to assist in determining the impact of
      the vulnerability in individual networks.
      
      CVSS is a standards based scoring method that conveys vulnerability
      severity and helps determine urgency and priority of response.
      
      Cisco has provided an FAQ to answer additional questions regarding
      CVSS at 
      http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
      
      Cisco has also provided a CVSS calculator to help compute the
      environmental impact for individual networks at 
      http://intellishield.cisco.com/security/alertmanager/cvss
      
      CSCsj58566 - Memory Leak due to PPTP Session Termination
      
        CVSS Base Score - 7.1
      
        Access Vector:          Network
        Access Complexity:      Medium
        Authentication:         None
      
        Confidentiality Impact: None
        Integrity Impact:       None
        Availability Impact:    Complete
      
        CVSS Temporal Score - 5.9
      
        Exploitability:         Functional
        Remediation Level:      Official-Fix
        Report Confidence:      Confirmed
      
      CSCdv59309 - Virtual Access Interfaces Are Not Re-used
      
        CVSS Base Score - 4.3
      
        Access Vector:          Network
        Access Complexity:      Medium
        Authentication:         None
      
        Confidentiality Impact: None
        Integrity Impact:       None
        Availability Impact:    Partial
      
        CVSS Temporal Score - 3.6
      
        Exploitability:         Functional
        Remediation Level:      Official-Fix
        Report Confidence:      Confirmed
      
      Impact
      ======
      
      Successful exploitation of the vulnerability may result in a memory
      leak of processor memory or consumption of all available IDBs on the
      device. With continued exploitation, the device will deplete its
      processor memory or reach an IDB limit. Both impacts would result in
      a denial of service condition for the device.
      
      Software Versions and Fixes
      ===========================
      
      When considering software upgrades, also consult 
      http://www.cisco.com/go/psirt and any subsequent advisories to 
      determine exposure and a complete upgrade solution.
      
      In all cases, customers should exercise caution to be certain the
      devices to be upgraded contain sufficient memory and that current
      hardware and software configurations will continue to be supported
      properly by the new release. If the information is not clear, contact
      the Cisco Technical Assistance Center ("TAC") or your contracted
      maintenance provider for assistance.
      
      Each row of the Cisco IOS software table (below) names a Cisco IOS
      release train. If a given release train is vulnerable, then the
      earliest possible releases that contain the fix (along with the
      anticipated date of availability for each, if applicable) are listed
      in the "First Fixed Release" column of the table. The "Recommended
      Release" column indicates the releases which have fixes for all the
      published vulnerabilities at the time of this Advisory. A device
      running a release in the given train that is earlier than the release
      in a specific column (less than the First Fixed Release) is known to
      be vulnerable. Cisco recommends upgrading to a release equal to or
      later than the release in the "Recommended Releases" column of the
      table.
      
      +----------------------------------------+
      |   Major    | Availability of Repaired  |
      |  Release   |         Releases          |
      |------------+---------------------------|
      |  Affected  | First Fixed | Recommended |
      | 12.0-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.0       | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0DB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0DC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0S      | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0ST     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0T      | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0W      | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0WC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0WT     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(7)XE2  |             |
      |            | are         |             |
      | 12.0XE     | vulnerable, |             |
      |            | release     |             |
      |            | 12.0(7)XE2  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.0XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XI     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XJ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XQ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.1-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.1       | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1AA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1AX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(22)AY1 |             |
      |            | are         |             |
      | 12.1AY     | vulnerable, | 12.1(22)    |
      |            | release     | EA11        |
      |            | 12.1(22)AY1 |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.1AZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1CX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1DB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1DC     | first fixed | 12.4(18a)   |
      |            | in 12.2B    |             |
      |------------+-------------+-------------|
      | 12.1E      | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(11)EA1 |             |
      |            | are         |             |
      | 12.1EA     | vulnerable, | 12.1(22)    |
      |            | release     | EA11        |
      |            | 12.1(11)EA1 |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.1EB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1EC     | first fixed | 12.3(23)BC1 |
      |            | in 12.2BC   |             |
      |------------+-------------+-------------|
      | 12.1EO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EX     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.1EY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EZ     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.1GA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1GB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1T      | migrate to  | 12.3(26)    |
      |            | any release |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XI     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XJ     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.1XK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XL     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XM     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.1XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XP     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XQ     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XR     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XS     | migrate to  | 12.3(26)    |
      |            | any release |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XT     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.1XU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XV     | first fixed | 12.3(26)    |
      |            | in 12.2XB   |             |
      |------------+-------------+-------------|
      | 12.1XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XY     | migrate to  | 12.3(26)    |
      |            | any release |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YA     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YB     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YC     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YD     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(5)YE6  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1YE     | release     | 12.3(26)    |
      |            | 12.1(5)YE6  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YF     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.1YG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1YH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YI     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.1YJ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.2-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2       | migrate to  | 12.3(26)    |
      |            | any release |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2B      | 12.2(4)B5   | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | 12.2(15)    |             |
      |            | BC1e        |             |
      |            |             |             |
      | 12.2BC     | 12.2(15)    | 12.3(23)BC1 |
      |            | BC2d        |             |
      |            |             |             |
      |            | 12.2(8)BC1  |             |
      |------------+-------------+-------------|
      |            | 12.2(4)BW1  |             |
      | 12.2BW     |             | 12.3(26)    |
      |            | 12.2(4)BW1a |             |
      |------------+-------------+-------------|
      | 12.2BY     | 12.2(8)BY   | 12.4(18a)   |
      |------------+-------------+-------------|
      | 12.2BZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2DA     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2DD     | first fixed | 12.4(18a)   |
      |            | in 12.2B    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2DX     | first fixed | 12.4(18a)   |
      |            | in 12.2B    |             |
      |------------+-------------+-------------|
      | 12.2EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EWA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2IXA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2IXB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2IXC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2IXD    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2IXE    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2JK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2MB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2MC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(18)S   |             |
      |            | are         |             |
      |            | vulnerable, |             |
      |            | release     |             |
      | 12.2S      | 12.2(18)S   | 12.2(25)S15 |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | migrate to  |             |
      |            | any release |             |
      |            | in 12.2SRC  |             |
      |------------+-------------+-------------|
      | 12.2SB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SBC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SCA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SED    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEE    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEF    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEG    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SGA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SRA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SRB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SRC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SU     | migrate to  | 12.4(18a)   |
      |            | any release |             |
      |            | in 12.3T    |             |
      |------------+-------------+-------------|
      | 12.2SV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVD    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(17a)SX |             |
      |            | are         |             |
      |            | vulnerable, |             |
      |            | release     | 12.2(18)    |
      | 12.2SX     | 12.2(17a)SX | SXF13       |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | migrate to  |             |
      |            | any release |             |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      | 12.2SXA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SXB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SXD    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SXE    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SXF    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SXH    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SY     | migrate to  | 12.2(18)    |
      |            | any release | SXF13       |
      |            | in 12.2SXB  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2SZ     | migrate to  | 12.2(28)    |
      |            | any release | SB12        |
      |            | in 12.2SRC  |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | 12.2(15)T4e |             |
      | 12.2T      |             | 12.3(26)    |
      |            | 12.2(8)T    |             |
      |------------+-------------+-------------|
      | 12.2TPC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2UZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XA     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.2XB     | 12.2(2)XB5  | 12.3(26)    |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XC     | migrate to  | 12.4(18a)   |
      |            | any release |             |
      |            | in 12.3T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XD     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XE     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XF     | first fixed | 12.3(23)BC1 |
      |            | in 12.2BC   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XG     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XH     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XI     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XJ     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XK     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.2XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2XO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XQ     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.2XR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XS     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XT     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XU     | migrate to  | 12.3(26)    |
      |            | any release |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XV     | migrate to  | 12.3(26)    |
      |            | any release |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YC     | first fixed | 12.3(26)    |
      |            | in 12.2T    |             |
      |------------+-------------+-------------|
      | 12.2YD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2YE     | migrate to  | 12.2(28)    |
      |            | any release | SB12        |
      |            | in 12.2SRC  |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      | 12.2YF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YJ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YO     | migrate to  | 12.2(18)    |
      |            | any release | SXF13       |
      |            | in 12.2SXB  |             |
      |------------+-------------+-------------|
      | 12.2YP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YQ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YT     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YX     | migrate to  | 12.4(18a)   |
      |            | any release |             |
      |            | in 12.3T    |             |
      |------------+-------------+-------------|
      | 12.2YY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2YZ     | migrate to  | 12.2(28)    |
      |            | any release | SB12        |
      |            | in 12.2SRC  |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZA     | migrate to  | 12.2(18)    |
      |            | any release | SXF13       |
      |            | in 12.2SXB  |             |
      |------------+-------------+-------------|
      | 12.2ZB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZJ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2ZY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.3-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |----------------------------------------|
      |    There are no affected 12.3 based    |
      |                releases                |
      |----------------------------------------|
      |  Affected  | First Fixed | Recommended |
      | 12.4-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |----------------------------------------|
      |    There are no affected 12.4 based    |
      |                releases                |
      +----------------------------------------+
      
      Workarounds
      ===========
      
      There are no workarounds for this vulnerability. Cisco recommends
      upgrading to the fixed version of Cisco IOS.
      
      Obtaining Fixed Software
      ========================
      
      Cisco will make free software available to address this vulnerability
      for affected customers. This advisory will be updated as fixed
      software becomes available. Prior to deploying software, customers
      should consult their maintenance provider or check the software for
      feature set compatibility and known issues specific to their
      environment.
      
      Customers may only install and expect support for the feature sets
      they have purchased. By installing, downloading, accessing or
      otherwise using such software upgrades, customers agree to be bound
      by the terms of Cisco's software license terms found at 
      http://www.cisco.com/public/sw-license-agreement.html 
      or as otherwise set forth at Cisco.com Downloads at 
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
      
      Do not contact either "psirt at cisco dot com" or "security-alert at cisco dot com"
      for software upgrades.
      
      Customers with Service Contracts
      +-------------------------------
      
      Customers with contracts should obtain upgraded software through
      their regular update channels. For most customers, this means that
      upgrades should be obtained through the Software Center on Cisco's
      worldwide website at http://www.cisco.com.
      
      Customers using Third Party Support Organizations
      +------------------------------------------------
      
      Customers whose Cisco products are provided or maintained through
      prior or existing agreement with third-party support organizations
      such as Cisco Partners, authorized resellers, or service providers
      should contact that support organization for guidance and assistance
      with the appropriate course of action in regards to this advisory.
      
      The effectiveness of any workaround or fix is dependent on specific
      customer situations such as product mix, network topology, traffic
      behavior, and organizational mission. Due to the variety of affected
      products and releases, customers should consult with their service
      provider or support organization to ensure any applied workaround or
      fix is the most appropriate for use in the intended network before it
      is deployed.
      
      Customers without Service Contracts
      +----------------------------------
      
      Customers who purchase direct from Cisco but who do not hold a Cisco
      service contract and customers who purchase through third-party
      vendors but are unsuccessful at obtaining fixed software through
      their point of sale should get their upgrades by contacting the Cisco
      Technical Assistance Center (TAC). TAC contacts are as follows.
      
        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: tac at cisco dot com
      
      Have your product serial number available and give the URL of this
      notice as evidence of your entitlement to a free upgrade. Free
      upgrades for non-contract customers must be requested through the
      TAC.
      
      Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
      for additional TAC contact information, including special localized
      telephone numbers and instructions and e-mail addresses for use in
      various languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerability described in this advisory.
      
      We would like to thank Martin Kluge of Elxsi Security for reporting
      these vulnerabilities to us. We greatly appreciate the opportunity to
      work with researchers on security vulnerabilities, and welcome the
      opportunity to review and assist with security vulnerability reports
      against Cisco products.
      
      Status of this Notice: FINAL
      ============================
      
      THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
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      omits the distribution URL in the following section is an
      uncontrolled copy, and may lack important information or contain
      factual errors.
      
      Distribution
      ============
      
      This advisory is posted on Cisco's worldwide website at :
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080206-pptp.shtml
      
      In addition to worldwide web posting, a text version of this notice
      is clear-signed with the Cisco PSIRT PGP key and is posted to the
      following e-mail and Usenet news recipients.
      
        * cust-security-announce at cisco dot com
        * first-teams at first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot com
      
      Future updates of this advisory, if any, will be placed on Cisco's
      worldwide website, but may or may not be actively announced on
      mailing lists or newsgroups. Users concerned about this problem are
      encouraged to check the above URL for any updates.
      
      Revision History
      ================
      
      +---------------------------------------+
      | Revision |               | Initial    |
      | 1.0      | 2008-March-26 | public     |
      |          |               | release    |
      +---------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities in Cisco
      products, obtaining assistance with security incidents, and
      registering to receive security information from Cisco, is available
      on Cisco's worldwide website at 
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
      This includes instructions for press inquiries regarding Cisco 
      security notices. All Cisco security advisories are available at 
      http://www.cisco.com/go/psirt.
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