[apops] Cisco Security Advisory: Cisco IOS Secure Copy Authorization Byp

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Secure Copy Authorization Bypass Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 8 Aug 2007 12:37:21 -0400
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      Cisco Security Advisory: 
      Cisco IOS Secure Copy Authorization Bypass Vulnerability
      
      Advisory ID: cisco-sa-20070808-scp
      
      http://www.cisco.com/warp/public/707/cisco-sa-20070808-scp.shtml
      
      Revision 1.0
      
      For Public Release 2007 August 08 1600 UTC (GMT)
      
      - -----------------------------------------------------------------------
      
      Summary
      =======
      
      The server side of the Secure Copy (SCP) implementation in Cisco
      Internetwork Operating System (IOS) contains a vulnerability that
      allows any valid user, regardless of privilege level, to transfer files
      to and from an IOS device that is configured to be a Secure Copy
      server. This vulnerability could allow valid users to retrieve or write
      to any file on the device's filesystem, including the device's saved
      configuration. This configuration file may include passwords or other
      sensitive information.
      
      The IOS Secure Copy Server is an optional service that is disabled by
      default. Devices that are not specifically configured to enable the IOS
      Secure Copy Server service are not affected by this vulnerability.
      
      This vulnerability does not apply to the IOS Secure Copy Client
      feature.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20070808-scp.shtml.
      
      Note: The August 08, 2007 publication includes four Security Advisories
      and one Security Response. The advisories all affect IOS, one
      additionally affects Cisco Unified Communications Manager as well. Each
      advisory lists the releases that correct the vulnerability described in
      the advisory, and the advisories also detail the releases that correct
      the vulnerabilities in all four advisories. Individual publication
      links are listed below:
      
        * Cisco IOS Information Leakage Using IPv6 Routing Header
          http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-IPv6-leak.shtml
        * Cisco IOS Next Hop Resolution Protocol Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20070808-nhrp.shtml
        * Cisco IOS Secure Copy Authorization Bypass Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20070808-scp.shtml
        * Voice Vulnerabilities in Cisco IOS and Cisco Unified Communications Manager
          http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
        * Cisco Unified MeetingPlace XSS Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sr-20070808-mp.shtml
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Cisco devices running certain 12.2-based IOS releases and configured to
      offer Secure Copy server functionality are affected by this issue.
      
      A device running a vulnerable Cisco IOS 12.2-based is affected if the
      following command is present in the device configuration:
      
                      ip scp server enable
      
      The IOS Secure Copy server is disabled by default.
      
      The Secure Copy server functionality is only available on
      encryption-capable images. Devices that do not run an
      encryption-capable images, which contain either k8 or k9 in the image
      name, are not vulnerable. If a device is running an encryption-capable
      image, the existence of the "ip scp server enable" command in the
      configuration will determine whether the device is affected.
      
      Please consult the table of fixed software in the Software Version and
      Fixes section for the specific 12.2-based IOS releases that are
      affected.
      
      To determine the software 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". The image name will be displayed
      between parentheses on the next line of output followed by "Version"
      and 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 running IOS release
      12.2(18)SXF10:
      
          Cisco Internetwork Operating System Software
          IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9-M), Version 12.2(18)SXF10, RELEASE SOFTWARE (fc1)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2007 by cisco Systems, Inc.
          Compiled Fri 13-Jul-07 08:32 by kellythw
      
      
      Additional information about Cisco IOS release naming is available at
      http://www.cisco.com/warp/public/620/1.html.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco devices that do not run IOS are not affected.
      
      Cisco IOS devices that do not have the Secure Copy server feature
      enabled are not affected.
      
      The following IOS release trains are not affected:
      
        * 12.0-based releases
        * 12.1-based releases
        * 12.3-based releases
        * 12.4-based releases
      
      Cisco IOS XR is not affected.
      
      No other Cisco devices are known to be affected.
      
      Details
      =======
      
      Secure Copy (SCP) is a protocol similar to the Remote Copy (RCP)
      protocol, which allows for the transfer of files between systems. The
      main difference between SCP and RCP is that in SCP, all aspects of the
      file transfer session, including authentication, occur in encrypted
      form, which makes SCP a more secure alternative than RCP. SCP relies on
      the Secure Shell (SSH) protocol, which uses TCP port 22 by default.
      
      The server side of the Secure Copy implementation in Cisco IOS contains
      a vulnerability that allows any valid user, regardless of privilege
      level, to transfer files to and from an IOS device that is configured
      to be a Secure Copy server. This vulnerability could allow valid users
      to retrieve or write to any file on the device's filesystem, including
      the device's saved configuration. This configuration file may include
      passwords or other sensitive information.
      
      This vulnerability does not allow for authentication bypass; login
      credentials are verified and access is only granted if a valid username
      and password is provided. This vulnerability may cause authorization to
      be bypassed.
      
      A device with the Secure Copy server enabled is vulnerable regardless
      of whether Authentication, Authorization, and Accounting (AAA) is
      enabled. If access control is enabled on the Virtual Terminal (vty) via
      the "login" command, which allows logins via Virtual Terminals, then the
      device is affected.
      
      This vulnerability is documented in Cisco Bug ID CSCsc19259.
      
      
      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 1.0.
      
      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.
      
      Cisco PSIRT will set the bias in all cases to normal. Customers are
      encouraged to apply the bias parameter when determining the
      environmental impact of a particular vulnerability.
      
      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.
      
      CSCsc19259 - "All privilege level users can SCP running config"
      
      CVSS Base Score - 6.0
          Access Vector -            Remote
          Access Complexity -        Low
          Authentication -           Required
          Confidentiality Impact -   Complete
          Integrity Impact -         Complete
          Availability Impact -      Complete
          Impact Bias -              Normal
      
      CVSS Temporal Score - 5.0
          Exploitability -           Functional
          Remediation Level -        Official-Fix
          Report Confidence -        Confirmed
      
      
      
      Impact
      ======
      
      Successful exploitation of the vulnerability described in this advisory
      may allow valid but unauthorized users to retrieve or write to any file
      on the device's filesystem, including the device's saved configuration.
      This configuration file may include passwords or other sensitive
      information.
      
      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.
      
      For further information about how Cisco IOS is built, numbered and
      maintained, please see the following URL: 
      http://www.cisco.com/warp/public/620/1.html
      
      +-------------------------------------------------------------+
      |    Major     |      Availability of Repaired Releases       |
      |   Release    |                                              |
      |--------------+----------------------------------------------|
      | Affected     |                            | Recommended     |
      | 12.0-Based   | First Fixed Release        | Release         |
      | Release      |                            |                 |
      |-------------------------------------------------------------|
      | There are no affected 12.0 based releases                   |
      |-------------------------------------------------------------|
      | Affected     |                            | Recommended     |
      | 12.1-Based   | First Fixed Release        | Release         |
      | Release      |                            |                 |
      |-------------------------------------------------------------|
      | There are no affected 12.1 based releases                   |
      |-------------------------------------------------------------|
      | Affected     |                            | Recommended     |
      | 12.2-Based   | First Fixed Release        | Release         |
      | Release      |                            |                 |
      |--------------+----------------------------+-----------------|
      | 12.2         | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2B        | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2BC       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2BW       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2BY       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2BZ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2CX       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2CY       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2CZ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2DA       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2DD       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2DX       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 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      | Vulnerable; first fixed in | 12.2(18)IXD1    |
      |              | 12.2(18)IXD1               |                 |
      |--------------+----------------------------+-----------------|
      | 12.2IXB      | Vulnerable; first fixed in | 12.2(18)IXD1    |
      |              | 12.2(18)IXD1               |                 |
      |--------------+----------------------------+-----------------|
      | 12.2IXC      | Vulnerable; first fixed in | 12.2(18)IXD1    |
      |              | 12.2(18)IXD1               |                 |
      |--------------+----------------------------+-----------------|
      | 12.2IXD      | 12.2(18)IXD1               | 12.2(18)IXD1    |
      |--------------+----------------------------+-----------------|
      | 12.2JA       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2JK       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2MB       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2MC       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2S        | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SB       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SBC      | 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             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SU       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SV       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SVA      | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SVC      | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SW       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SX       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SXA      | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SXB      | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SXD      | Vulnerable; contact TAC    |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SXE      | Vulnerable; first fixed in | 12.2(18)SXF10   |
      |              | 12.2(18)SXF9               |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SXF      | 12.2(18)SXF9               | 12.2(18)SXF10   |
      |--------------+----------------------------+-----------------|
      | 12.2SXH      | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SY       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2SZ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2T        | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2TPC      | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2UZ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2VZ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XA       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XB       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XC       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XD       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XE       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XF       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XG       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XH       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XI       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XJ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XK       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XL       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XM       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XN       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XQ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XR       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XS       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XT       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XU       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XV       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2XW       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YA       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YB       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YC       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YD       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YE       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 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             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YO       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 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             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YX       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YY       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2YZ       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2ZA       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 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             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2ZR       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      |              | Vulnerable; first fixed in | 12.2(33)SXH;    |
      | 12.2ZU       | 12.2(33)SXH available      | available       |
      |              | 31-Aug-07                  | 31-Aug-07       |
      |--------------+----------------------------+-----------------|
      | 12.2ZW       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | 12.2ZY       | Not Vulnerable             |                 |
      |--------------+----------------------------+-----------------|
      | Affected     |                            | Recommended     |
      | 12.3-Based   | First Fixed Release        | Release         |
      | Release      |                            |                 |
      |-------------------------------------------------------------|
      | There are no affected 12.3 based releases                   |
      |-------------------------------------------------------------|
      | Affected     |                            | Recommended     |
      | 12.4-Based   | First Fixed Release        | Release         |
      | Release      |                            |                 |
      |-------------------------------------------------------------|
      | There are no affected 12.4 based releases                   |
      +-------------------------------------------------------------+
      
      Workarounds
      ===========
      
      If the IOS Secure Copy Server functionality is not needed then the
      vulnerability described in this document can be mitigated by disabling
      the Secure Copy server. The Secure Copy server can be disabled by
      executing the following command in global configuration mode:
      
                      no ip scp server enable
      
      
      If the Secure Copy server cannot be disabled due to operational
      concerns, then no workarounds exist. The risk posed by this
      vulnerability can be mitigated by following the best practices detailed
      in "Improving Security on Cisco Routers" at 
      http://www.cisco.com/warp/public/707/21.html. Please refer to the 
      Obtaining Fixed Software section for appropriate solutions to resolve 
      this vulnerability.
      
      Due to the nature of this vulnerability, networking best practices like
      access control lists (ACLs) and Control Plane Policing (CoPP) that
      restrict access to a device to certain IP addresses or subnetworks may
      not be effective. If access is already granted to a specific IP address
      or subnetwork, a user with low privileges will be able to establish a
      Secure Copy session with the device, which would allow the user to
      exploit this vulnerability.
      
      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.
      
      This vulnerability was reported to Cisco by Vijay Sarvepalli from
      University of North Carolina at Greensboro.
      
      Status of this Notice: FINAL
      ============================
      
      THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
      KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
      MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
      INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT
      YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
      DOCUMENT AT ANY TIME.
      
      A stand-alone copy or Paraphrase of the text of this document that
      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-20070808-scp.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 1.0  | 2007-August-08   | Initial 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.
      
      - -----------------------------------------------------------------------
      All contents are Copyright 2006-2007 Cisco Systems, Inc. All rights
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