Guest

Products & Services

Cisco IOS Software Internet Key Exchange Resource Exhaustion Vulnerability

Hierarchical Navigation

Advisory ID: cisco-sa-20090923-ipsec

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090923-ipsec

Revision 1.2

For Public Release 2009 September 23 16:00  UTC (GMT)

Summary

Cisco IOS® devices that are configured for Internet Key Exchange (IKE) protocol and certificate based authentication are vulnerable to a resource exhaustion attack. Successful exploitation of this vulnerability may result in the allocation of all available Phase 1 security associations (SA) and prevent the establishment of new IPsec sessions.

Cisco has released free software updates that address this vulnerability.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090923-ipsec.

Note: The September 23, 2009, Cisco IOS Security Advisory bundled publication includes eleven Security Advisories. Ten of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory.

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep09.html

Affected Products

Cisco IOS devices that are configured for IKE and certificate based authentication are affected, if there are RSA keys present on the device.

Vulnerable Products

IKE is enabled by default if IPsec is used. Cisco IOS devices that are configured for IKE will listen on UDP port 500, UDP port 4500 if the device is configured for NAT Traversal (NAT-T), or UDP ports 848 or 4848 if the device is configured for Group Domain of Interpretation (GDOI). The following outputs show a router that is listening on UDP port 500:

Router#show ip sockets 
Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
....
 17   --listen--          192.168.66.129    500   0   0   11   0 
....

Or

Router-#show udp
Proto        Remote      Port      Local       Port  In Out  Stat TTY OutputIF
 17       --listen--          192.0.2.1         500   0   0  1011   0 
 17(v6)   --listen--          --any--           500   0   0 20011   0 
Router#

IKE configurations that are performing certificate based authentication will display Rivest-Shamir-Adleman Signature as the authentication method in the output of the show crypto isakmp policy command. This output is shown in the following example:

Router#show crypto isakmp policy                               

Global IKE policy
Default protection suite
        encryption algorithm:   DES - Data Encryption Standard (56 bit keys).
        hash algorithm:         Secure Hash Standard
        authentication method:  Rivest-Shamir-Adleman Signature
        Diffie-Hellman group:   #1 (768 bit)
        lifetime:               86400 seconds, no volume limit

The show crypto key mypubkey rsa command can be used to check whether there are RSA keys present on the system. This output is shown in the following example:

Router#show crypto key mypubkey rsa
% Key pair was generated at: 06:07:49 UTC Jan 13 1996
Key name: myrouter.example.com
  Usage: Signature Key
  Key Data:
   005C300D 06092A86 4886F70D 01010105 00034B00 30480241 00C5E23B
   55D6AB22
   04AEF1BA A54028A6 9ACC01C5 129D99E4 64CAB820 847EDAD9 DF0B4E4C
   73A05DD2
   BD62A8A9 FA603DD2 E2A8A6F8 98F76E28 D58AD221 B583D7A4 71020301 0001
 
% Key pair was generated at: 06:07:50 UTC Jan 13 1996 
Key name: myrouter.example.com
  Usage: Encryption Key
  Key Data:
   00302017 4A7D385B 1234EF29 335FC973 2DD50A37 C4F4B0FD 9DADE748
   429618D5
   18242BA3 2EDFBDD3 4296142A DDF7D3D8 08407685 2F2190A0 0B43F1BD 
   9A8A26DB
   07953829 791FCDE9 A98420F0 6A82045B 90288A26 DBC64468 7789F76E EE21

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 6500 Series device that is running Cisco IOS Software release 12.2(18)SXF7 with an installed image name of s72033_rp-IPSERVICESK9_WAN-M:

Router#show version 
Cisco Internetwork Operating System Software 
IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright ©) 1986-2006 by cisco Systems, Inc.
Compiled Thu 23-Nov-06 06:42 by kellythw
<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.

Products Confirmed Not Vulnerable

Cisco IOS XR Software is not affected by this vulnerability.

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

Details

IPsec is an IP security feature that provides robust authentication and encryption of IP packets. IKE is a key management protocol standard that is used in conjunction with the IPsec standard.

IKE is a hybrid protocol that implements the Oakley and SKEME key exchanges inside the Internet Security Association and Key Management Protocol (ISAKMP) framework. (ISAKMP, Oakley, and SKEME are security protocols that are implemented by IKE.). More information on IKE is available at the following link:

http://www.cisco.com/en/US/docs/ios/12_1/security/configuration/guide/scdike.html

A vulnerability exists in the IKE implementation of Cisco IOS Software, if the certificate based authentication method is used. Successful exploitation of this vulnerability may result in the allocation of all available Phase 1 SAs, which may prevent new IPSec sessions from being established.

Administrators can view Phase 1 SAs that are allocated as a result of exploitation by issuing the show crypto isakmp sa command. The following example displays sample output for this command:

Router#show crypto isakmp sa
IPv4 Crypto ISAKMP SA
dst             src             state          conn-id slot status
10.48.66.77     10.48.66.6      MM_KEY_EXCH       1004 ACTIVE
10.48.66.77     10.48.66.6      MM_KEY_EXCH       1003 ACTIVE
10.48.66.77     10.48.66.6      MM_KEY_EXCH       1002 ACTIVE
....

Any allocated SA can be de-allocated up manually by using the clear crypto isakmp <conn-ID> command.

This vulnerability is addressed by the Cisco Bug IDs CSCsy07555 (registered customers only) and CSCee72997 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2009-2868.

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 .

CSCsy07555 - P1 SA stuck in KEY_EXCH forever

Calculate the environmental score of CSCsy07555

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCee72997 - P1 SA stuck in KEY_EXCH forever

Calculate the environmental score of CSCee72997

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of this vulnerability may result in the allocation of all available Phase 1 SAs, which may prevent new IPsec sessions from being established.

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 Release

Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release

Recommended Release

There are no affected 12.0 based releases

Affected 12.1-Based Releases

First Fixed Release

Recommended Release

There are no affected 12.1 based releases

Affected 12.2-Based Releases

First Fixed Release

Recommended Release

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

Releases prior to 12.2(44)EX are vulnerable, release 12.2(44)EX and later are not vulnerable; migrate to any release in 12.2SEG

12.2(50)SE3

12.2(52)SE; Available on 13-OCT-2009

12.2EY

Not Vulnerable

  

12.2EZ

Not Vulnerable

  

12.2FX

Not Vulnerable

  

12.2FY

Not Vulnerable

  

12.2FZ

Not Vulnerable

  

12.2IRA

Vulnerable; first fixed in 12.2SRD

12.2(33)SRD3

12.2IRB

Vulnerable; first fixed in 12.2SRD

12.2(33)SRD3

12.2IRC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

  

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

  

12.2IXH

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)SB6

12.2(31)SB16

12.2(33)SB7

12.2SBC

Not Vulnerable

  

12.2SCA

Vulnerable; first fixed in 12.2SCB

12.2(33)SCB4

12.2SCB

12.2(33)SCB4

12.2(33)SCB4

12.2SE

12.2(50)SE3

12.2(52)SE; Available on 13-OCT-2009

12.2(50)SE3

12.2(52)SE; Available on 13-OCT-2009

12.2SEA

Not Vulnerable

  

12.2SEB

Not Vulnerable

  

12.2SEC

Not Vulnerable

  

12.2SED

Not Vulnerable

  

12.2SEE

Not Vulnerable

  

12.2SEF

Not Vulnerable

  

12.2SEG

Not Vulnerable

  

12.2SG

Not Vulnerable

  

12.2SGA

Not Vulnerable

  

12.2SL

Not Vulnerable

  

12.2SM

Not Vulnerable

  

12.2SO

Not Vulnerable

  

12.2SQ

Not Vulnerable

  

12.2SRA

Vulnerable; first fixed in 12.2SRD

12.2(33)SRD3

12.2SRB

Vulnerable; first fixed in 12.2SRD

12.2(33)SRD3

12.2SRC

12.2(33)SRC5; Available on 29-OCT-2009

12.2(33)SRD3

12.2SRD

12.2(33)SRD3

12.2(33)SRD2a

12.2(33)SRD3

12.2STE

Not Vulnerable

  

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

12.2(33)SXH6; Available on 30-OCT-2009

Please see IOS Software Modularity Patch

12.2(33)SXH6; Available on 30-OCT-2009

12.2SXI

12.2(33)SXI2a

12.2(33)SXI2a

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

  

12.2XNA

Please see Cisco IOS-XE Software Availability

  

12.2XNB

Please see Cisco IOS-XE Software Availability

  

12.2XNC

Please see Cisco IOS-XE Software Availability

  

12.2XND

Please see Cisco IOS-XE Software Availability

  

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 12.3-Based Releases

First Fixed Release

Recommended Release

12.3

Not Vulnerable

  

12.3B

Not Vulnerable

  

12.3BC

Not Vulnerable

  

12.3BW

Not Vulnerable

  

12.3EU

Not Vulnerable

  

12.3JA

Not Vulnerable

  

12.3JEA

Not Vulnerable

  

12.3JEB

Not Vulnerable

  

12.3JEC

Not Vulnerable

  

12.3JK

Not Vulnerable

  

12.3JL

Not Vulnerable

  

12.3JX

Not Vulnerable

  

12.3T

Vulnerable; first fixed in 12.4

Releases up to and including 12.3(8)T11 are not vulnerable.

12.4(25b)

12.4(23b)

12.3TPC

Not Vulnerable

  

12.3VA

Not Vulnerable

  

12.3XA

Not Vulnerable

  

12.3XB

Not Vulnerable

  

12.3XC

Not Vulnerable

  

12.3XD

Not Vulnerable

  

12.3XE

Not Vulnerable

  

12.3XF

Not Vulnerable

  

12.3XG

Not Vulnerable

  

12.3XI

Not Vulnerable

  

12.3XJ

Not Vulnerable

  

12.3XK

Not Vulnerable

  

12.3XL

Vulnerable; first fixed in 12.4T

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3XQ

Not Vulnerable

  

12.3XR

Vulnerable; first fixed in 12.4

12.4(25b)

12.4(23b)

12.3XS

Vulnerable; first fixed in 12.4

12.4(25b)

12.4(23b)

12.3XU

Not Vulnerable

  

12.3XW

Not Vulnerable

  

12.3XX

Vulnerable; first fixed in 12.4

12.4(25b)

12.4(23b)

12.3XY

Not Vulnerable

  

12.3XZ

Not Vulnerable

  

12.3YA

Vulnerable; first fixed in 12.4

12.4(25b)

12.4(23b)

12.3YD

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YF

Vulnerable; migrate to any release in 12.4XN

12.4(15)XR7

12.4(22)XR

12.3YG

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YH

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YI

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YJ

Not Vulnerable

  

12.3YK

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YM

Not Vulnerable

  

12.3YQ

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YS

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YT

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YU

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.3YX

Vulnerable; migrate to any release in 12.4XN

12.4(15)XR7

12.4(22)XR

12.3YZ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

  

12.3ZA

Not Vulnerable

  

Affected 12.4-Based Releases

First Fixed Release

Recommended Release

12.4

Releases prior to 12.4(7) are vulnerable; Releases 12.4(7a) and later are not vulnerable.

12.4(25b)

12.4(23b)

12.4GC

Not Vulnerable

  

12.4JA

Not Vulnerable

  

12.4JDA

Not Vulnerable

  

12.4JDC

Not Vulnerable

  

12.4JDD

Not Vulnerable

  

12.4JK

Not Vulnerable

  

12.4JL

Not Vulnerable

  

12.4JMA

Not Vulnerable

  

12.4JMB

Not Vulnerable

  

12.4JX

Not Vulnerable

  

12.4MD

Not Vulnerable

  

12.4MDA

Not Vulnerable

  

12.4MR

Not Vulnerable

  

12.4SW

Not Vulnerable

  

12.4T

12.4(4)T8

12.4(9)T

12.4(6)T1

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.4XA

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.4XB

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.4XC

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.4XD

Vulnerable; first fixed in 12.4T

12.4(15)T10

12.4(20)T4

12.4(22)T3

12.4(24)T2; Available on 23-OCT-2009

12.4XE

Not Vulnerable

  

12.4XF

Not Vulnerable

  

12.4XG

Not Vulnerable

  

12.4XJ

Not Vulnerable

  

12.4XK

Not Vulnerable

  

12.4XL

Not Vulnerable

  

12.4XM

Not Vulnerable

  

12.4XN

Not Vulnerable

  

12.4XP

Not Vulnerable

  

12.4XQ

Not Vulnerable

  

12.4XR

Not Vulnerable

  

12.4XT

Not Vulnerable

  

12.4XV

Not Vulnerable

  

12.4XW

Not Vulnerable

  

12.4XY

Not Vulnerable

  

12.4XZ

Not Vulnerable

  

12.4YA

Not Vulnerable

  

12.4YB

Not Vulnerable

  

12.4YD

Not Vulnerable

  

12.4YE

Not Vulnerable

  

Cisco IOS XE Software

Cisco IOS XE Software Release

First Fixed Release

2.1.x

2.3.0t

2.2.x

2.3.0t

2.3.x

Not Vulnerable

2.4.x

Not Vulnerable

Cisco IOS Software Modularity - Maintenance Packs

Customers who are using Cisco IOS Software Modularity can apply the respective maintenance packs. More information on Cisco IOS Software Modularity can be found at the following link: http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_bulletin0900aecd80313e15.html

The Maintenance Packs listed below can be downloaded at http://www.cisco.com/go/pn

Cisco IOS Software Modularity Maintenance Pack for 12.2SXH

Cisco IOS Software Release

Solution Maintenance Pack(MP)

12.2(33)SXH5

MP001

Workarounds

If RSA keys are not needed on the system, the crypto key zeroize rsa command can be used to delete all RSA keys from your system. Note that this will break all features that are using RSA keys, including the Secure Shell (SSH).

Additional mitigations that can be deployed on Cisco devices in the network are available 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-20090923-ipsec

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 with Service Contracts

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 a customer.

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-20090923-ipsec

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 1.2

2009-October-19

Updated ION software table.

Revision 1.1

2009-October-02

Added crypto key zeroize rsa command as a workaround.

Revision 1.0

2009-September-23

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.