Advisory ID: cisco-sa-20070808-nhrp
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-nhrp
Revision 1.2
For Public Release 2007 August 8 16:00 UTC (GMT)
Contents
Summary
Affected Products
Details
Vulnerability Scoring Details
Impact
Software Versions and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of This Notice: Final
Distribution
Revision History
Cisco Security Procedures
Summary
The Cisco Next Hop Resolution Protocol (NHRP) feature in Cisco IOS contains a vulnerability that can result in a restart of the device or possible remote code execution.
NHRP is a primary component of the Dynamic Multipoint Virtual Private Network (DMVPN) feature.
NHRP can operate in three ways: at the link layer (Layer 2), over Generic Routing Encapsulation (GRE) and multipoint GRE (mGRE) tunnels and directly on IP (IP protocol number 54). This vulnerability affects all three methods of operation.
NHRP is not enabled by default for Cisco IOS.
This vulnerability is addressed by Cisco bug IDs CSCin95836 ( registered customers only) for non-12.2 mainline releases and CSCsi23231 ( registered customers only) for 12.2 mainline releases.
This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-nhrp.
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-IOS-IPv6-leak
-
Cisco IOS Next Hop Resolution Protocol Vulnerability
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-nhrp
-
Cisco IOS Secure Copy Authorization Bypass Vulnerability
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-scp
-
Voice Vulnerabilities in Cisco IOS and Cisco Unified Communications
Manager
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-IOS-voice
-
Cisco Unified MeetingPlace XSS Vulnerability
http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20070808-mp
Affected Products
Vulnerable Products
Cisco devices running IOS that are configured for NHRP functionality are affected. NHRP is also used in conjunction with the DMVPN feature.
Affected devices may have the following command in the running configuration:
ip nhrp network-id <ID>
After the above command is configured, simply removing the command from the running configuration is not sufficient to disable the NHRP service. Customers can check the output of the following command to see if the NHRP process is enabled:
router#show processes | include NHRP 42 Mwe F8B8CC 24 76 315 7836/12000 0 NHRP
If the preceding command displays the NHRP process, NHRP is running on the IOS device.
Customers who do not have NHRP configured but see the process in the process table can take the following action to eliminate their exposure:
Ensure that NHRP is not configured in the device's startup configuration and reload the device. After the device is restarted with NHRP removed from the configuration, the NHRP process will not be running.
Products Confirmed Not Vulnerable
-
Cisco devices that do not run Cisco IOS are not affected.
-
Cisco devices that are running Cisco IOS XR are not affected.
No other Cisco devices are known to be affected.
Details
NHRP is a standards-based protocol that is aimed at providing Layer 2 to Layer 3 resolution for Nonbroadcast Multiaccess networks (NBMA).
Network devices and hosts can use NHRP to discover the addresses of other devices connected to an NBMA network.
For more information on NHRP, see http://www.cisco.com/en/US/docs/ios/ipaddr/configuration/guide/iad_cfg_nhrp_ps6441_TSD_Products_Configuration_Guide_Chapter.html
NHRP is an open standard and the public RFC is on the web at:
http://www.rfc-editor.org/rfc/rfc2332.txt
NHRP has extended uses in DMVPNs, can be carried in GRE and mGRE tunnels or can be transported directly within IP datagrams as IP protocol number 54.
Workarounds are available for protecting routers from NHRP packets sent over GRE or mGRE tunnels or sent as NHRP directly in IP datagrams.
No workarounds exist for blocking Layer 2 NHRP packets. However, Layer 2 NHRP packets are not routable and must be sent by a Layer 2-adjacent device.
This vulnerability was addressed by two different bug IDs. A Cisco IOS release only needs to contain one of these bug fixes to be repaired for this vulnerablility. The bug IDs are CSCin95836 ( registered customers only) (for non-12.2 mainline releases) and CSCsi23231 ( registered customers only) (for 12.2 mainline releases).
Vulnerability Scoring Details
Cisco is providing scores for the vulnerability 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 a 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.
|
CSCin95836 - Buffer overflow in NHRP protocol ( registered customers only)
Calculate the environmental score of
CSCin95836
|
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|---|---|---|---|---|---|---|
|
CVSS Base Score - 8 |
||||||
|
Access Vector |
Access Complexity |
Authentication |
Confidentiality Impact |
Integrity Impact |
Availability Impact |
Impact Bias |
|
Remote |
High |
Not Required |
Complete |
Complete |
Complete |
Normal |
|
CVSS Temporal Score - 6.3 |
||||||
|
Exploitability |
Remediation Level |
Report Confidence |
||||
|
Proof-of-Concept |
Official-Fix |
Confirmed |
||||
|
CSCsi23231 - Buffer overflow in NHRP protocol ( registered customers only)
Calculate the environmental score of
CSCin23231
|
||||||
|---|---|---|---|---|---|---|
|
CVSS Base Score - 8 |
||||||
|
Access Vector |
Access Complexity |
Authentication |
Confidentiality Impact |
Integrity Impact |
Availability Impact |
Impact Bias |
|
Remote |
High |
Not Required |
Complete |
Complete |
Complete |
Normal |
|
CVSS Temporal Score - 6.3 |
||||||
|
Exploitability |
Remediation Level |
Report Confidence |
||||
|
Proof-of-Concept |
Official-Fix |
Confirmed |
||||
Impact
Successful exploitation of the vulnerability may result in a restart of the device or remote code execution. Repeated exploitation may result in an extended denial of service (DoS) condition.
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 Release |
Availability of Repaired Releases |
|
|---|---|---|
|
Affected 12.0-Based Release |
First Fixed Release |
Recommended Release |
|
12.0 |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0DA |
Not Vulnerable |
|
|
12.0DB |
Not Vulnerable |
|
|
12.0DC |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.0S |
12.0(32)S8; available 21-Aug-07 |
12.0(32)S8; available 21-Aug-07 |
|
12.0SC |
Vulnerable; first fixed in 12.3(17a)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.0SL |
Vulnerable; first fixed in 12.0(32)S8; available 21-Aug-07 |
12.0(32)S8; available 21-Aug-07 |
|
12.0SP |
Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07 |
12.0(32)S8; available 21-Aug-07 |
|
12.0ST |
Vulnerable; first fixed in 12.0(32)S8; available 21-Aug-07 |
12.0(32)S8; available 21-Aug-07 |
|
12.0SX |
Vulnerable; first fixed in 12.0(32)S8; available 21-Aug-07 |
12.0(32)S8; available 21-Aug-07 |
|
12.0SY |
12.0(32)SY4; available 21-Aug-07 |
12.0(32)SY4; available 21-Aug-07 |
|
12.0SZ |
Vulnerable; first fixed in 12.0(32)S8; available 21-Aug-07 |
|
|
12.0T |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0W |
Not Vulnerable |
|
|
12.0WC |
Not Vulnerable |
|
|
12.0WT |
Not Vulnerable |
|
|
12.0XA |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XB |
Not Vulnerable |
|
|
12.0XC |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XD |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XE |
Vulnerable; first fixed in 12.1(27b)E3; available 10-Aug-07 |
|
|
12.0XF |
Not Vulnerable |
|
|
12.0XG |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XH |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XI |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XJ |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XK |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XL |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XM |
Not Vulnerable |
|
|
12.0XN |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XQ |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XR |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.0XS |
Not Vulnerable |
|
|
12.0XV |
Not Vulnerable |
|
|
12.0XW |
Not Vulnerable |
|
|
Affected 12.1-Based Release |
First Fixed Release |
Recommended Release |
|
12.1 |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1AA |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1AX |
Not Vulnerable |
|
|
12.1AY |
Not Vulnerable |
|
|
12.1AZ |
Not Vulnerable |
|
|
12.1CX |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1DA |
12.2(10)DA8 12.2(12)DA12 |
12.2(10)DA8 12.2(12)DA12 |
|
12.1DB |
Not Vulnerable |
|
|
12.1DC |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.1E |
12.1(27b)E3; available 5-Mar-08 |
|
|
12.1EA |
Not Vulnerable |
|
|
12.1EB |
Not Vulnerable |
|
|
12.1EC |
Vulnerable; first fixed in 12.3(17a)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.1EO |
Not Vulnerable |
|
|
12.1EU |
Vulnerable; first fixed in 12.2(25)EWA10 |
12.2(25)EWA10 |
|
12.1EV |
Not Vulnerable |
|
|
12.1EW |
Vulnerable; first fixed in 12.2(25)EWA10 |
All Cat4K platforms: 12.2(25)EWA10 12.2(31)SGA3 12.2(37)SG1 12.2(40)SG; available Oct-07 |
|
12.1EX |
Vulnerable; first fixed in 12.1(27b)E3; available 5-Mar-08 |
|
|
12.1EY |
Not Vulnerable |
|
|
12.1EZ |
Vulnerable; first fixed in 12.1(27b)E3; available 5-Mar-08 |
|
|
12.1GA |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1GB |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1T |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XA |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XB |
Not Vulnerable |
|
|
12.1XC |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XD |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XE |
Not Vulnerable |
|
|
12.1XF |
Not Vulnerable |
|
|
12.1XG |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XH |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XI |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XJ |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XK |
Not Vulnerable |
|
|
12.1XL |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XM |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XN |
Not Vulnerable |
|
|
12.1XO |
Not Vulnerable |
|
|
12.1XP |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XQ |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XR |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XS |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XT |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XU |
Not Vulnerable |
|
|
12.1XV |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1XW |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XX |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XY |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1XZ |
Vulnerable; first fixed in 12.2(46) |
12.2(46a) |
|
12.1YA |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1YB |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1YC |
Not Vulnerable |
|
|
12.1YD |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1YE |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1YF |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1YG |
Not Vulnerable |
|
|
12.1YH |
Not Vulnerable |
|
|
12.1YI |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.1YJ |
Not Vulnerable |
|
|
Affected 12.2-Based Release |
First Fixed Release |
Recommended Release |
|
12.2 |
12.2(26c); available 14-Aug-07 12.2(27c); available 14-Aug-07 12.2(28d); available 14-Aug-07 12.2(29b); available 14-Aug-07 12.2(46) |
12.2(46a) |
|
12.2B |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2BC |
Vulnerable; first fixed in 12.3(17a)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.2BW |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2BY |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2BZ |
Vulnerable; first fixed in 12.3(7)XI10a available 21-Aug-07 |
12.3(7)XI10a; available 21-Aug-07 |
|
12.2CX |
Vulnerable; first fixed in 12.3(17a)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.2CY |
Vulnerable; first fixed in 12.3(17a)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.2CZ |
Not Vulnerable |
|
|
12.2DA |
12.2(10)DA8 12.2(12)DA12 |
12.2(10)DA8 12.2(12)DA12 |
|
12.2DD |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2DX |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2EU |
Vulnerable; first fixed in 12.2(25)EWA10 |
All Cat4K platforms: 12.2(25)EWA10 12.2(31)SGA3 12.2(37)SG1 12.2(40)SG; available Oct-07 |
|
12.2EW |
Vulnerable; first fixed in 12.2(25)EWA10 |
All Cat4K platforms: 12.2(25)EWA10 12.2(31)SGA3 12.2(37)SG1 12.2(40)SG; available Oct-07 |
|
12.2EWA |
12.2(25)EWA10 |
All Cat4K platforms: 12.2(25)EWA10 12.2(31)SGA3 12.2(37)SG1 12.2(40)SG; available Oct-07 |
|
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 |
Vulnerable; first fixed in 12.2(25)SW11 |
12.2(25)SW11 |
|
12.2MC |
12.2(15)MC2h 12.2(15)MC2j |
12.2(15)MC2j |
|
12.2S |
12.2(14)S19 12.2(18)S13 12.2(20)S14 12.2(25)S13 |
12.2(25)S13 12.2(14)S19 |
|
12.2SB |
12.2(28)SB9 12.2(31)SB6 |
12.2(28)SB9; available 15-Aug-07 12.2(31)SB6 |
|
12.2SBC |
Vulnerable; first fixed in 12.2(31)SB6 |
12.2(28)SB9; available 15-Aug-07 12.2(31)SB6 |
|
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 |
12.2(25)SG2; available 13-Aug-07 12.2(31)SG2; available 13-Aug-07 12.2(37)SG1; available 13-Aug-07 12.2(40)SG; available 24-Oct-07 |
All Cat4K platforms: 12.2(25)SG2 12.2(37)SG1 12.2(31)SG2 12.2(40)SG; available Oct-07 |
|
12.2SGA |
12.2(31)SGA3 12.2(31)SGA4; available 15-Oct-07 |
All Cat4K platforms: 12.2(31)SGA3 12.2(37)SG1 12.2(40)SG; available Oct-07 |
|
12.2SL |
Not Vulnerable |
|
|
12.2SM |
12.2(29)SM2; available 22-Aug-07 |
12.2(29)SM2; available 10-Aug-07 |
|
12.2SO |
Not Vulnerable |
|
|
12.2SRA |
Not Vulnerable |
|
|
12.2SRB |
Not Vulnerable |
|
|
12.2SU |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2SV |
12.2(29)SV4; available 14-Oct-07 |
12.2(29)SV4; available 14-Oct-07 |
|
12.2SVA |
Not Vulnerable |
|
|
12.2SVC |
Not Vulnerable |
|
|
12.2SW |
12.2(25)SW11 |
12.2(25)SW11 |
|
12.2SX |
Vulnerable; first fixed in 12.2(18)SXE4 |
|
|
12.2SXA |
Vulnerable; first fixed in 12.2(18)SXE4 |
|
|
12.2SXB |
Vulnerable; first fixed in 12.2(18)SXE4 |
12.2(18)SXF10 |
|
12.2SXD |
Vulnerable; contact TAC |
|
|
12.2SXE |
12.2(18)SXE4 |
12.2(18)SXF10 |
|
12.2SXF |
Not Vulnerable |
|
|
12.2SXH |
Not Vulnerable |
|
|
12.2SY |
Vulnerable; first fixed in 12.2(18)SXE4 |
|
|
12.2SZ |
Vulnerable; first fixed in 12.2(25)S13 |
12.2(25)S13 12.2(14)S19 |
|
12.2T |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2TPC |
12.2(8)TPC10c; available 17-Aug-07 |
12.2(8)TPC10c |
|
12.2UZ |
Vulnerable; first fixed in 12.2(31)SB6 |
12.2(28)SB9; available 15-Aug-07 12.2(31)SB6 |
|
12.2VZ |
Vulnerable; first fixed in 12.2(31)SB6 |
12.2(28)SB9; available 15-Aug-07 12.2(31)SB6 |
|
12.2XA |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XB |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XC |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2XD |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XE |
Not Vulnerable |
|
|
12.2XF |
Vulnerable; first fixed in 12.3(17a)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.2XG |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XH |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XI |
Not Vulnerable |
|
|
12.2XJ |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XK |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XL |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XM |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XN |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XQ |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XR |
12.3(2)JA3 |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XS |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XT |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XU |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XV |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2XW |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YA |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YB |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YC |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YD |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YE |
Vulnerable; first fixed in 12.2(25)S13 |
12.2(25)S13 12.2(14)S19 |
|
12.2YF |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YG |
Not Vulnerable |
|
|
12.2YH |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YJ |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YK |
Not Vulnerable |
|
|
12.2YL |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YM |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YN |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YO |
Not Vulnerable |
|
|
12.2YP |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YQ |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YR |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YS |
Not Vulnerable |
|
|
12.2YT |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2YU |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YV |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YW |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YX |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YY |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2YZ |
Vulnerable; first fixed in 12.2(25)S13 |
12.2(25)S13 12.2(14)S19 |
|
12.2ZA |
Vulnerable; first fixed in 12.2(18)SXE4 |
|
|
12.2ZB |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2ZC |
Not Vulnerable |
|
|
12.2ZD |
Vulnerable; contact TAC |
|
|
12.2ZE |
Vulnerable; first fixed in 12.3(17a) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.2ZF |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2ZG |
Vulnerable; contact TAC |
12.3(2)XA6 12.3(8)YG6; available 16-Aug-07 |
|
12.2ZH |
Vulnerable; contact TAC |
12.2(13)ZH9 |
|
12.2ZJ |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.2ZL |
Vulnerable, first fixed in 12.3(14)T5 for the Cisco 17xx; first fixed in 12.4(1c) for the Cisco 3200; first fixed in 12.3(7)XR7, available 13-Aug-07 for the ICS7750 |
|
|
12.2ZP |
Not Vulnerable |
|
|
12.2ZR |
Vulnerable; contact TAC |
|
|
12.2ZU |
Not Vulnerable |
|
|
12.2ZW |
Not Vulnerable |
|
|
12.2ZY |
Not Vulnerable |
|
|
Affected 12.3-Based Release |
First Fixed Release |
Recommended Release |
|
12.3 |
12.3(17a) 12.3(18) 12.3(19) 12.3(20) 12.3(21) 12.3(22) 12.3(23) |
12.3(23) 12.3(20a) 12.3(21b) 12.3(22a) 12.3(18a) 12.3(19a); available 16-Aug-07 12.3(17c); available 16-Aug-07 |
|
12.3B |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3BC |
12.3(17a)BC 12.3(21)BC |
12.3(17b)BC8 12.3(21a)BC3 |
|
12.3BW |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3EU |
Not Vulnerable |
|
|
12.3JA |
Not Vulnerable |
|
|
12.3JEA |
Not Vulnerable |
|
|
12.3JEB |
Not Vulnerable |
|
|
12.3JK |
Not Vulnerable |
|
|
12.3JL |
Not Vulnerable |
|
|
12.3JX |
Not Vulnerable |
|
|
12.3T |
Limited platform support is available 12.3(11)T12; available 16-Aug-07 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3TPC |
12.3(4)TPC11b; available 17-Aug-07 |
12.3(4)TPC11b; available 17-Aug-07 |
|
12.3VA |
Not Vulnerable |
|
|
12.3XA |
12.3(2)XA6 |
12.3(2)XA6 |
|
12.3XB |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XC |
12.3(2)XC5 |
12.3(2)XC5 |
|
12.3XD |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XE |
12.3(2)XE5; available 17-Aug-07 |
12.3(2)XE5 |
|
12.3XF |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XG |
Vulnerable; contact TAC |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XH |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XI |
12.3(7)XI10a; available 21-Aug-07 |
12.3(7)XI10a; available 21-Aug-07 |
|
12.3XJ |
Vulnerable; first fixed in 12.3(14)YX8 |
12.3(14)YX9; available 13-Aug-07 |
|
12.3XK |
Vulnerable; first fixed in 12.3(14)T5 |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XQ |
Vulnerable; first fixed in 12.4(1c) |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XR |
12.3(7)XR7; available 17-Aug-07 |
12.3(7)XR7; available 17-Aug-07 |
|
12.3XS |
Vulnerable; first fixed in 12.4(1c) |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.3XU |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3XW |
Vulnerable; first fixed in 12.3(14)YX8 |
12.3(14)YX9; available 13-Aug-07 |
|
12.3XY |
Not Vulnerable |
|
|
12.3YA |
Vulnerable; first fixed in 12.4(1c) |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) 12.3(8)YG6; available 16-Aug-07 |
|
12.3YD |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3YF |
Vulnerable; first fixed in 12.3(14)YX8 |
12.3(14)YX9; available 13-Aug-07 |
|
12.3YG |
12.3(8)YG6; available 16-Aug-07 |
12.3(8)YG6; available 16-Aug-07 |
|
12.3YH |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3YI |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3YJ |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3YK |
12.3(11)YK3; available 20-Aug-07 |
12.3(11)YK3; available 20-Aug-07 |
|
12.3YM |
12.3(14)YM5 |
12.3(14)YM11; available 23-Aug-07 |
|
12.3YQ |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3YS |
12.3(11)YS2; available 17-Aug-07 |
12.3(11)YS2 |
|
12.3YT |
Vulnerable; first fixed in 12.4(4)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.3YU |
Vulnerable; first fixed in 12.4(2)XB6 available 16-Aug-07 |
12.4(2)XB6; available 16-Aug-07 |
|
12.3YX |
12.3(14)YX8 |
12.3(14)YX9; available 13-Aug-07 |
|
12.3YZ |
12.3(11)YZ2; available 17-Aug-07 |
12.3(11)YZ2; available 17-Aug-07 |
|
Affected 12.4-Based Release |
First Fixed Release |
Recommended Release |
|
12.4 |
12.4(1c) 12.4(10) 12.4(12) 12.4(13) 12.4(16) 12.4(3b) 12.4(5) 12.4(7) 12.4(8) |
12.4(12c) 12.4(3h) 12.4(5c) 12.4(8d); available 03-Sep-07 12.4(7f) 12.4(16) 12.4(10c) 12.4(13d) |
|
12.4JA |
Not Vulnerable |
|
|
12.4JX |
Not Vulnerable |
|
|
12.4MD |
Not Vulnerable |
|
|
12.4MR |
12.4(12)MR1 12.4(11)MR 12.4(12)MR 12.4(12)MR2; available 14-Aug-07 12.4(4)MR 12.4(6)MR 12.4(9)MR |
12.4(12)MR2 |
|
12.4SW |
Not Vulnerable |
|
|
12.4T |
12.4(11)T 12.4(15)T 12.4(2)T3 12.4(4)T 12.4(6)T 12.4(9)T |
12.4(11)T3 12.4(9)T5; available 24-Aug-07 12.4(2)T6; available 20-Aug-07 12.4(4)T8; available 28-Aug-07 12.4(6)T8 12.4(15)T1 |
|
12.4XA |
Not Vulnerable |
|
|
12.4XB |
12.4(2)XB6; available 16-Aug-07 |
12.4(2)XB6; available 16-Aug-07 |
|
12.4XC |
Not Vulnerable |
|
|
12.4XD |
Not Vulnerable |
|
|
12.4XE |
Not Vulnerable |
|
|
12.4XF |
Not Vulnerable |
|
|
12.4XG |
Not Vulnerable |
|
|
12.4XJ |
Not Vulnerable |
|
|
12.4XK |
Not Vulnerable |
|
|
12.4XT |
Not Vulnerable |
|
|
12.4XV |
Not Vulnerable |
|
|
12.4XW |
Not Vulnerable |
|
Workarounds
Customers who do not need NHRP functionality may disable the NHRP service and eliminate the exposure to this vulnerability.
For customers who require NHRP functionality, this section provides some workarounds to help reduce exposure.
If NHRP is required, the only complete resolution to this issue is to upgrade to a fixed version of software.
Additional mitigations that can be deployed on Cisco devices within the network are discussed in the Cisco Applied Mitigation Bulletin companion document for this advisory, which is available at the following link:
Because this attack can be sent from spoofed source addresses, anti-spoofing techniques are required for the workarounds in this section to be most effective.
Infrastructure ACLs
Although it is often difficult to block traffic transiting the network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of the network. Infrastructure ACLs are considered a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for this specific vulnerability. The following ACL example should be included as part of the deployed infrastructure access list that will protect all devices with IP addresses in the infrastructure IP address range.
!--- Permit NHRP/GRE services from trusted hosts destined !--- to infrastructure addresses. access-list 150 permit 47 TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK access-list 150 permit 54 TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK !--- Deny NHRP/GRE packets from all other sources destined !--- to infrastructure addresses. access-list 150 deny 47 any INFRASTRUCTURE_ADDRESSES MASK access-list 150 deny 54 any INFRASTRUCTURE_ADDRESSES MASK !--- Permit all other traffic to transit the device. access-list 150 permit IP any any interface serial 2/0 ip access-group 150 in
The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper is on the web at
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
Control Plane Policing
Control Plane Policing (CoPP) can be used to block untrusted NHRP (IP protocol number 54) and GRE (IP protocol number 47) access to the affected device. Cisco IOS Software releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. Administrators can configure CoPP on a device to help protect the management and control planes. Configuring CoPP can minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic sent to infrastructure devices in accordance with existing security policies and configurations. Administrators can adapt the following example to their networks.
!--- Deny NHRP (IP protocol number 54) and GRE (IP protocol number 47)
!--- traffic from trusted hosts to all IP addresses configured
!--- on all interfaces of the affected device so that it will
!--- be allowed by the CoPP feature.
!
access-list 111 deny 54 TRUSTED_ADDRESSES MASK any
access-list 111 deny 47 TRUSTED_ADDRESSES MASK any
!
!--- Permit all other NHRP (IP protocol number 54) and GRE (IP protocol
!--- number 47) traffic sent to all IP addresses configured on
!--- all interfaces of the affected device so that it will be
!--- policed and dropped by the CoPP feature.
!
access-list 111 permit 54 any any
access-list 111 permit 47 any any
!
!--- Permit (Police or Drop)/Deny (Allow) all other Layer3
!--- and Layer4 traffic in accordance with existing security
!--- policies and configurations for traffic that is authorized
!--- to be sent to infrastructure devices.
!
!--- Create a class map for traffic to be policed by the CoPP
!--- feature.
!
class-map match-all drop-NHRP-class
match access-group 111
!
!--- Create a policy map that will be applied to the control plane
!--- of the affected device.
!
policy-map drop-NHRP-traffic
class drop-NHRP-class
drop
!
!--- Apply the policy map to the control plane of the device
!--- device.
!
control-plane
service-policy input drop-NHRP-traffic
!
In the preceding CoPP example, the access control list entries (ACEs) that match the potential exploit packets with the "permit" action result in the discarding of these packets by the policy-map "drop" function, whereas packets that match the "deny" action (not shown) are not affected by the policy-map drop function. Please note that in the 12.2S and 12.0S Cisco IOS Software trains, the policy-map syntax is different:
policy-map drop-NHRP-traffic class drop-NHRP-class police 32000 1500 1500 conform-action drop exceed-action drop
Additional information on the configuration and use of the CoPP feature is on the web at
and
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html
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@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 with Service Contracts
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@cisco.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
No known exploitation has occurred, exploit code has been made available on a public mailing list by the researcher.
This vulnerability was reported to Cisco by Martin Kluge.
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-nhrp
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-teams@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 1.2 |
2008-April-25 |
Updated links to CVSS scores for
CSCin95836
|
|
Revision 1.1 |
2007-August-09 |
Updated Exploitation and Public Announcements section with public exploit code information. |
|
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.
