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Cisco Security Advisory

Cisco IOS Next Hop Resolution Protocol Vulnerability

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)

Related Resources:

View related Applied Mitigation BulletinView related Alert

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:

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 leavingcisco.com

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 leavingcisco.com

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 leavingcisco.com

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:

http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20070808-nhrp

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

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd804fa16a.html

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 leavingcisco.com and CSCin23231 leavingcisco.com.

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/web/about/security/psirt/security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.


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