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Vulnerability Alert

Cisco IOS Software Internet Key Exchange IPsec Remote Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:18887
Version:1
First Published:2009 September 23 16:18 GMT
Last Published:2009 September 23 16:18 GMT
Port: 4500, 4848, 500, 848
CVE:CVE-2009-2868
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Security Advisory
 
 
Version Summary:

Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.? Updates are available.

 
 
Description

Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.?

The vulnerability is due to a error in the implementation of the Internet Key Exchange (IKE) protocol during certificate-based authentication.? An unauthenticated, remote attacker could exploit this vulnerability by making crafted requests to the system.? These requests could cause the system to expend resources that are required for the creation of IPsec sessions.? An exploit could cause a DoS condition on IPsec services, which could prevent the creation of new IPsec sessions.

Cisco has confirmed this vulnerability and released updated software.

 
Warning Indicators

Cisco has published a list of affected Cisco IOS Software releases in the security advisory.? The Vendor Announcements section of this alert contains a link to the advisory.

 
IntelliShield Analysis

The vulnerability only exists on systems that are configured to use the IKE protocol and certificate-based authentication, which are enabled by default if IPsec has been enabled.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.

 
Vendor Announcements

Cisco has released a security advisory to address Cisco bug IDs CSCsy07555 and CSCee72997 at the following link: cisco-sa-20090923-ipsec

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition on IPsec services.

 
Technical Information

The vulnerability is due to an error that may occur when the IKE protocol is configured for certificate-based authentication.? An unauthenticated, remote attacker could exploit this vulnerability by making crafted requests to the system.? The requests could cause the system to expend all available Phase 1 security associations (SAs) that are used to create new IPsec sessions.? An exploit could result in a DoS condition on IPsec.? No new IPsec sessions can be created until Phase 1 SAs have been de-allocated.?

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to monitor affected systems for signs of exploitation.? The Cisco Security Advisory provides additional details on system monitoring.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20090923-ipsec

 
Patches/Software

Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.

 
Alert History
 

Initial Release



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco IOS XE Software 2.1 .0, .1, .2 | 2.2 .1, .2, .3

Associated Products:
CiscoIOS 12.2IRA 12.2(33)IRA | 12.2IRB 12.2(33)IRB | 12.2IRC 12.2(33)IRC | 12.2SB 12.2(33)SB, 12.2(33)SB1, 12.2(33)SB2, 12.2(33)SB3, 12.2(33)SB4 | 12.2SCA 12.2(33)SCA, 12.2(33)SCA1, 12.2(33)SCA2 | 12.2SCB 12.2(33)SCB, 12.2(33)SCB1, 12.2(33)SCB2, 12.2(33)SCB3 | 12.2SE 12.2(40)SE, 12.2(44)SE, 12.2(44)SE1, 12.2(44)SE2, 12.2(44)SE3, 12.2(44)SE5, 12.2(44)SE6, 12.2(46)SE, 12.2(50)SE, 12.2(50)SE1 | 12.2SRA 12.2(33)SRA, 12.2(33)SRA1, 12.2(33)SRA2, 12.2(33)SRA3, 12.2(33)SRA4, 12.2(33)SRA5, 12.2(33)SRA6, 12.2(33)SRA7 | 12.2SRB 12.2(33)SRB, 12.2(33)SRB1, 12.2(33)SRB2, 12.2(33)SRB3, 12.2(33)SRB4, 12.2(33)SRB5, 12.2(33)SRB5a | 12.2SRC 12.2(33)SRC, 12.2(33)SRC1, 12.2(33)SRC2, 12.2(33)SRC3, 12.2(33)SRC4 | 12.2SRD 12.2(33)SRD, 12.2(33)SRD1, 12.2(33)SRD2 | 12.2SXH 12.2(33)SXH, 12.2(33)SXH0a, 12.2(33)SXH1, 12.2(33)SXH2, 12.2(33)SXH2a, 12.2(33)SXH3, 12.2(33)SXH3a, 12.2(33)SXH4, 12.2(33)SXH5 | 12.2SXI 12.2(33)SXI, 12.2(33)SXI1 | 12.2XN 12.2(33)XN, 12.2(33)XN1 | 12.2XS 12.2(1)XS1 | 12.2ZW 12.2(33)ZW | 12.2ZZ 12.2(33)ZZ | 12.3T 12.3(11)T, 12.3(11)T1, 12.3(11)T10, 12.3(11)T11, 12.3(11)T12, 12.3(11)T2, 12.3(11)T2a, 12.3(11)T3, 12.3(11)T4, 12.3(11)T5, 12.3(11)T6, 12.3(11)T7, 12.3(11)T8, 12.3(11)T9, 12.3(14)T, 12.3(14)T1, 12.3(14)T2, 12.3(14)T3, 12.3(14)T4, 12.3(14)T5, 12.3(14)T6, 12.3(14)T7 | 12.3TO 12.3(11)TO3 | 12.3XL 12.3(11)XL, 12.3(11)XL1, 12.3(11)XL2, 12.3(11)XL3 | 12.3XR 12.3(7)XR, 12.3(7)XR1, 12.3(7)XR2, 12.3(7)XR3, 12.3(7)XR4, 12.3(7)XR5, 12.3(7)XR6, 12.3(7)XR7 | 12.3XS 12.3(7)XS, 12.3(7)XS1, 12.3(7)XS2 | 12.3XX 12.3(8)XX, 12.3(8)XX1, 12.3(8)XX2, 12.3(8)XX2a, 12.3(8)XX2b, 12.3(8)XX2c, 12.3(8)XX2d, 12.3(8)XX2e | 12.3YA 12.3(8)YA, 12.3(8)YA1 | 12.3YC 12.3(8)YC, 12.3(8)YC1, 12.3(8)YC2, 12.3(8)YC3 | 12.3YD 12.3(8)YD, 12.3(8)YD1 | 12.3YF 12.3(11)YF, 12.3(11)YF1, 12.3(11)YF2, 12.3(11)YF3, 12.3(11)YF4 | 12.3YG 12.3(8)YG, 12.3(8)YG1, 12.3(8)YG2, 12.3(8)YG3, 12.3(8)YG4, 12.3(8)YG5, 12.3(8)YG6, 12.3(8)YG7 | 12.3YH 12.3(8)YH | 12.3YI 12.3(8)YI, 12.3(8)YI1, 12.3(8)YI2, 12.3(8)YI3 | 12.3YK 12.3(11)YK, 12.3(11)YK1, 12.3(11)YK2, 12.3(11)YK3 | 12.3YL 12.3(11)YL, 12.3(11)YL1, 12.3(11)YL2 | 12.3YN 12.3(11)YN | 12.3YQ 12.3(14)YQ, 12.3(14)YQ1, 12.3(14)YQ2, 12.3(14)YQ3, 12.3(14)YQ4, 12.3(14)YQ5, 12.3(14)YQ6, 12.3(14)YQ7, 12.3(14)YQ8 | 12.3YR 12.3(11)YR, 12.3(11)YR1 | 12.3YS 12.3(11)YS, 12.3(11)YS1, 12.3(11)YS2 | 12.3YT 12.3(14)YT, 12.3(14)YT1 | 12.3YU 12.3(14)YU, 12.3(14)YU1 | 12.3YX 12.3(14)YX, 12.3(14)YX1, 12.3(14)YX10, 12.3(14)YX11, 12.3(14)YX12, 12.3(14)YX13, 12.3(14)YX14, 12.3(14)YX15, 12.3(14)YX2, 12.3(14)YX3, 12.3(14)YX4, 12.3(14)YX7, 12.3(14)YX8, 12.3(14)YX9 | 12.3YZ 12.3(11)YZ, 12.3(11)YZ1, 12.3(11)YZ2 | 12.3ZB 12.3(11)ZB, 12.3(11)ZB1, 12.3(11)ZB2 | 12.4 12.4(1), 12.4(1a), 12.4(1b), 12.4(1c), 12.4(3), 12.4(3a), 12.4(3b), 12.4(3c), 12.4(3d), 12.4(3e), 12.4(3f), 12.4(5), 12.4(5a), 12.4(7) | 12.4M 12.4(5a)M0 | 12.4T 12.4(2)T, 12.4(2)T1, 12.4(2)T2, 12.4(2)T3, 12.4(2)T4, 12.4(2)T5, 12.4(2)T6, 12.4(4)T, 12.4(4)T1, 12.4(4)T2, 12.4(4)T3, 12.4(4)T4, 12.4(4)T5, 12.4(4)T6, 12.4(4)T7, 12.4(6)T | 12.4XA 12.4(2)XA, 12.4(2)XA1, 12.4(2)XA2 | 12.4XB 12.4(2)XB, 12.4(2)XB1, 12.4(2)XB10, 12.4(2)XB2, 12.4(2)XB3, 12.4(2)XB4, 12.4(2)XB5, 12.4(2)XB6, 12.4(2)XB7, 12.4(2)XB8, 12.4(2)XB9 | 12.4XC 12.4(4)XC, 12.4(4)XC1, 12.4(4)XC2, 12.4(4)XC3, 12.4(4)XC4, 12.4(4)XC5, 12.4(4)XC6, 12.4(4)XC7 | 12.4XD 12.4(4)XD, 12.4(4)XD1, 12.4(4)XD10, 12.4(4)XD11, 12.4(4)XD12, 12.4(4)XD2, 12.4(4)XD3, 12.4(4)XD4, 12.4(4)XD5, 12.4(4)XD6, 12.4(4)XD7, 12.4(4)XD8, 12.4(4)XD9




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The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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