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Cisco Security Advisory: Cisco IOS Software Secure Copy Privilege Escalation Vulnerability

Advisory ID: cisco-sa-20090325-scp

http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml

Revision 1.0

For Public Release 2009 March 25 1600 UTC (GMT)

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Summary =======

The server side of the Secure Copy (SCP) implementation in Cisco IOS software contains a vulnerability that could allow authenticated users with an attached command-line interface (CLI) view to transfer files to and from a Cisco IOS device that is configured to be an SCP server, regardless of what users are authorized to do, per the CLI view configuration. This vulnerability could allow valid users to retrieve or write to any file on the device's file system, including the device's saved configuration and Cisco IOS image files, even if the CLI view attached to the user does not allow it. This configuration file may include passwords or other sensitive information.

The Cisco IOS SCP server is an optional service that is disabled by default. CLI views are a fundamental component of the Cisco IOS Role-Based CLI Access feature, which is also disabled by default. Devices that are not specifically configured to enable the Cisco IOS SCP server, or that are configured to use it but do not use role-based CLI access, are not affected by this vulnerability.

This vulnerability does not apply to the Cisco IOS SCP client feature.

Cisco has released free software updates that address this vulnerability.

There are no workarounds available for this vulnerability apart from disabling either the SCP server or the CLI view feature if these services are not required by administrators.

This advisory is posted at the following link: http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml

Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. All of the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, 2009, or earlier.

http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml

Individual publication links are listed below:

* Cisco IOS cTCP Denial of Service Vulnerability http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml

* Cisco IOS Software Multiple Features IP Sockets Vulnerability http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml

* Cisco IOS Software Mobile IP and Mobile IPv6 Vulnerabilities http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml

* Cisco IOS Software Secure Copy Privilege Escalation Vulnerability http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml

* Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml

* Cisco IOS Software Multiple Features Crafted TCP Sequence Vulnerability http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml

* Cisco IOS Software Multiple Features Crafted UDP Packet Vulnerability http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml

* Cisco IOS Software WebVPN and SSLVPN Vulnerabilities http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml

Affected Products =================

Vulnerable Products +------------------

Cisco devices running an affected Cisco IOS software release, configured to offer SCP server functionality, and configured to use role-based ACL access are affected by this issue.

A device running a vulnerable Cisco IOS software release is affected if its configuration is similar to the following:

parser view <view name> <Definition of the CLI view> ! username <user ID> view <view name> secret <some secret> ! ip scp server enable

In the above configuration snippet, the parser view command defines a view that specifies what commands users in that view can execute. The username command defines a local user and attaches, via the view keyword, the previously defined view to the user. And finally, the ip scp server enable command enables the Cisco IOS SCP server.

The absence of the username command does not guarantee that the device's configuration is not affected by this vulnerability because the name of a CLI view can be supplied by means of an Authentication, Authorization, and Accounting (AAA) server by using the cli-view-name attribute.

Note: The CLI view attached to a user can be supplied by a AAA server. When inspecting a device's configuration to determine if it is affected by this vulnerability it is better to check if the SCP service is enabled (ip scp server enabled command) and whether there are any CLI views defined (parser view command).

The Cisco IOS SCP server and role-based CLI access features are disabled by default.

The SCP server functionality is only available on encryption-capable images. Encryption-capable images are those that contain either a "k8" or "k9" in the image name, for example, "C7200-ADVSECURITYK9-M". Devices that do not run encryption-capable images are not vulnerable. If a device is running an encryption-capable image, the presence in the configuration of the ip scp server enable command, the existence of CLI views (parser view command), and whether there are users (local or remote) attached to these views will determine if the device is affected.

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:

Router#show version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by cisco Systems, Inc. Compiled Mon 17-Mar-08 14:39 by dchih

!--- output truncated

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C1841-ADVENTERPRISEK9-M:

Router#show version Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by Cisco Systems, Inc. Compiled Thu 10-Jul-08 20:25 by prod_rel_team

!--- output truncated

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html

Cisco IOS XE Software is also affected by this vulnerability.

Products Confirmed Not Vulnerable +--------------------------------

Cisco devices that do not run Cisco IOS software are not affected.

Cisco IOS devices that do not have the SCP server feature enabled, or that make use of the feature but do not have the role-based CLI feature enabled, are not affected.

Cisco IOS XR Software is not affected.

No other Cisco products are currently known to be affected by this vulnerability.

Details =======

SCP is a protocol similar to the Remote Copy (RCP) protocol, which allows 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 Role-Based CLI Access feature allows the network administrator to define "views". Views are sets of operational commands and configuration capabilities that provide selective or partial access to Cisco IOS software EXEC and configuration (Config) mode commands. Views restrict user access to Cisco IOS command-line interface (CLI) and configuration information; that is, a view can define what commands are accepted and what configuration information is visible. For more information about the Role-Based CLI Access feature, reference http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/gtclivws.html

The server side of the SCP implementation in Cisco IOS software contains a vulnerability that allows authenticated users with an attached command-line interface (CLI) view to transfer files to and from a Cisco IOS device that is configured to be a SCP server, regardless of what users are authorized to do, per the CLI view configuration. This vulnerability could allow authenticated users to retrieve or write to any file on the device's file system, including the device's saved configuration and Cisco IOS image files. This configuration file may include passwords or other sensitive information.

In the affected configuration presented in the Affected Products section, users confined to a CLI view can elevate their privileges by using SCP to write to the device's configuration. Note that a view can be attached to a user when defining the user in the local database (via the username <user name> view ... command), or by passing the attribute cli-view-name from an AAA server.

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.

This vulnerability is documented in the Cisco Bug ID CSCsv38166 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2009-0637.

Vulnerability Scoring Details ==============================

Cisco has provided 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.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

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

CSCsv38166 - SCP + views (role-based CLI) allows privilege escalation

CVSS Base Score - 9.0

Access Vector - Network Access Complexity - Low Authentication - Single Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 7.4

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 file system, including the device's saved configuration and Cisco IOS image files. 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.

+-------------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |------------+------------------------------------------------------| | Affected | | Recommended | | 12.0-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.1-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.2-Based | First Fixed Release | Release | | Releases | | | |------------+------------------------------------+-----------------| | 12.2 | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2B | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2BC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2BW | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2BX | 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 | | |------------+------------------------------------+-----------------| | 12.2EW | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2EWA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2EX | Vulnerable; migrate to any release | 12.2(44)SE6 | | | in 12.2SEG | | |------------+------------------------------------+-----------------| | 12.2EY | Vulnerable; first fixed in 12.2SE | 12.2(44)SE6 | |------------+------------------------------------+-----------------| | 12.2EZ | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2FX | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2FY | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2FZ | Not Vulnerable | | |------------+------------------------------------+-----------------| | | | 12.2(33)SRC4; | | 12.2IRA | Vulnerable; first fixed in 12.2SRC | Available on | | | | 18-MAY-2009 | |------------+------------------------------------+-----------------| | | | 12.2(33)SRC4; | | 12.2IRB | Vulnerable; first fixed in 12.2SRC | Available on | | | | 18-MAY-2009 | |------------+------------------------------------+-----------------| | 12.2IXA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2IXB | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2IXC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2IXD | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2IXE | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2IXF | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2IXG | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2JA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2JK | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2MB | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2MC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2S | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SB | 12.2(33)SB4 | 12.2(33)SB4 | |------------+------------------------------------+-----------------| | 12.2SBC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SCA | Vulnerable; first fixed in 12.2SCB | 12.2(33)SCB1 | |------------+------------------------------------+-----------------| | 12.2SCB | 12.2(33)SCB1 | 12.2(33)SCB1 | |------------+------------------------------------+-----------------| | | 12.2(50)SE | | | 12.2SE | | 12.2(44)SE6 | | | 12.2(44)SE6 | | |------------+------------------------------------+-----------------| | 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 | | |------------+------------------------------------+-----------------| | | 12.2(52)SG; Available on | 12.2(52)SG; | | 12.2SG | 15-MAY-2009 | Available on | | | | 15-MAY-2009 | |------------+------------------------------------+-----------------| | 12.2SGA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SL | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SM | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SO | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SQ | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.2SRA | Not Vulnerable | | |------------+------------------------------------+-----------------| | | | 12.2(33)SRC4; | | | | Available on | | | | 18-MAY-2009 | | 12.2SRB | Vulnerable; first fixed in 12.2SRC | | | | | 12.2(33)SRB5a; | | | | Available on | | | | 3-April-2009 | |------------+------------------------------------+-----------------| | | 12.2(33)SRC4; Available on | 12.2(33)SRC4; | | 12.2SRC | 18-MAY-2009 | Available on | | | | 18-MAY-2009 | |------------+------------------------------------+-----------------| | 12.2SRD | 12.2(33)SRD1 | 12.2(33)SRD1 | |------------+------------------------------------+-----------------| | 12.2STE | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.2SU | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SV | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SVA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SVC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SVD | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SVE | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SW | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SX | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXB | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXD | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXE | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXF | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXH | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SXI | 12.2(33)SXI1 | 12.2(33)SXI1 | |------------+------------------------------------+-----------------| | 12.2SY | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2SZ | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2T | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2TPC | 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 | | |------------+------------------------------------+-----------------| | | | 12.2(33)SB4 | | | | | | | | 12.2(33)SRD1 | | 12.2XN | Vulnerable; first fixed in 12.2SRC | | | | | 12.2(33)SRC4; | | | | Available on | | | | 18-MAY-2009 | |------------+------------------------------------+-----------------| | | | 12.2(33)SRD1 | | | | | | 12.2XNA | Vulnerable; first fixed in 12.2SRD | 12.2(33)SRC4; | | | | Available on | | | | 18-MAY-2009 | |------------+------------------------------------+-----------------| | 12.2XNB | 12.2(33)XNB3 | 12.2(33)XNB3 | |------------+------------------------------------+-----------------| | 12.2XNC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2XO | 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 | | |------------+------------------------------------+-----------------| | 12.2ZU | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2ZX | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2ZY | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.2ZYA | Not Vulnerable | | |------------+------------------------------------+-----------------| | Affected | | Recommended | | 12.3-Based | First Fixed Release | Release | | Releases | | | |------------+------------------------------------+-----------------| | 12.3 | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3B | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3BC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3BW | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3EU | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3JA | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.3JEA | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.3JEB | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.3JEC | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3JK | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3JL | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3JX | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3T | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3TPC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3VA | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.3XA | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3XB | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3XC | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3XD | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3XE | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.3XF | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XG | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3XI | Vulnerable; first fixed in 12.2SB | 12.2(33)SB4 | |------------+------------------------------------+-----------------| | 12.3XJ | Vulnerable; first fixed in 12.3YX | 12.3(14)YX14 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XK | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XL | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XQ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(18e) | | | | | | 12.3XR | Vulnerable; first fixed in 12.4 | 12.4(23a); | | | | Available on | | | | 30-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XS | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XU | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3XW | Vulnerable; first fixed in 12.3YX | 12.3(14)YX14 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XX | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3XY | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3XZ | Not Vulnerable | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YA | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YD | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3YF | Vulnerable; first fixed in 12.3YX | 12.3(14)YX14 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YG | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YH | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YI | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YJ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YK | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3YM | 12.3(14)YM13 | 12.3(14)YM13 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YQ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YS | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3YU | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.3YX | 12.3(14)YX14 | 12.3(14)YX14 | |------------+------------------------------------+-----------------| | 12.3YZ | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.3ZA | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | Affected | | Recommended | | 12.4-Based | First Fixed Release | Release | | Releases | | | |------------+------------------------------------+-----------------| | | 12.4(18e) | 12.4(18e) | | | | | | 12.4 | 12.4(23a); Available on | 12.4(23a); | | | 30-APR-2009 | Available on | | | | 30-APR-2009 | |------------+------------------------------------+-----------------| | 12.4JA | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4JDA | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4JK | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4JL | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4JMA | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4JMB | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4JX | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4MD | 12.4(11)MD7 | 12.4(11)MD7 | |------------+------------------------------------+-----------------| | 12.4MR | 12.4(19)MR2 | 12.4(19)MR2 | |------------+------------------------------------+-----------------| | 12.4SW | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | | 12.4(24)T | | | | | 12.4(22)T1 | | | 12.4(20)T2 | | | 12.4T | | 12.4(15)T9; | | | 12.4(22)T1 | Available on | | | | 29-APR-2009 | | | 12.4(15)T9; Available on | | | | 29-APR-2009 | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XA | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XB | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XC | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | 12.4(4)XD12; Available on | 12.4(4)XD12; | | 12.4XD | 27-MAR-2009 | Available on | | | | 27-MAR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XF | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | 12.4(20)T2 | | | 12.4XG | | 12.4(15)T9; | | | 12.4(22)T1 | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XK | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | Releases prior to 12.4(15)XL4 are | | | 12.4XL | vulnerable, release 12.4(15)XL4 | 12.4(15)XL4 | | | and later are not vulnerable; | | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XM | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.4XN | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4XP | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4XQ | 12.4(15)XQ2 | 12.4(15)XQ2 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XR | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.4XV | Vulnerable; contact TAC | | |------------+------------------------------------+-----------------| | 12.4XW | 12.4(11)XW10 | 12.4(11)XW10 | |------------+------------------------------------+-----------------| | | | 12.4(22)T1 | | | | | | 12.4XY | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+------------------------------------+-----------------| | 12.4XZ | 12.4(15)XZ2 | 12.4(15)XZ2 | |------------+------------------------------------+-----------------| | 12.4YA | 12.4(20)YA2 | 12.4(20)YA3 | |------------+------------------------------------+-----------------| | 12.4YB | Not Vulnerable | | |------------+------------------------------------+-----------------| | 12.4YD | Not Vulnerable | | +-------------------------------------------------------------------+

Workarounds ===========

If the Cisco IOS SCP server functionality is not needed then the vulnerability described in this document can be mitigated by disabling the SCP server or the CLI view feature. The SCP server can be disabled by executing the following command in global configuration mode:

no ip scp server enable

If the SCP 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 "Cisco Guide to Harden Cisco IOS Devices" at http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080... Please refer to the Obtaining Fixed Software section of this advisory 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 an SCP session with the device, which would allow the user to exploit this vulnerability.

Obtaining Fixed Software ========================

Cisco has released free software updates that address these vulnerabilities. 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/en/US/docs/general/warranty/English/EU1KEN_.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml

Do not contact psirt@cisco.com or security-alert@cisco.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 agreements 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 do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire 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@cisco.com

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including 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 Kevin Graham. Cisco would like to thank Mr. Graham for reporting this vulnerability and working with us towards coordinated disclosure of the vulnerability.

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-20090325-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@cisco.com * first-bulletins@lists.first.org * bugtraq@securityfocus.com * vulnwatch@vulnwatch.org * cisco@spot.colorado.edu * cisco-nsp@puck.nether.net * full-disclosure@lists.grok.org.uk * comp.dcom.sys.cisco@newsgate.cisco.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 | 2009-March-25 | 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.h... This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt