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TITLE:
Cisco IOS IKE XAUTH Implementation Security Bypass Vulnerabilities

SECUNIA ADVISORY ID:
SA14853

VERIFY ADVISORY:
http://secunia.com/advisories/14853/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

OPERATING SYSTEM:
Cisco IOS R12.x
http://secunia.com/product/50/
Cisco IOS 12.x
http://secunia.com/product/182/

DESCRIPTION:
Two vulnerabilities have been reported in Cisco IOS, which can be
exploited by malicious people to bypass certain security
restrictions.

1) An error in the processing of IKE (Internet Key Exchange) XAUTH
messages can be be exploited via specially crafted packets to
complete authentication and gain access to network resources.

Successful exploitation requires knowledge of the shared group key to
complete the IKE Phase 1 negotiation.

2) An error within the handling of ISAKMP profile attributes may
cause the attributes to not be processed and result in a deadlock
condition, which can be exploited to establish an unauthorised IPsec
SA (Security Association).

This vulnerability only affects ISAKMP profiles matched by
certificate maps.

The vulnerabilities affect network devices running the Cisco IOS
12.2T, 12.3, and 12.3T release trains and are configured for Cisco
Easy VPN Server XAUTH version 6 authentication.

SOLUTION:
See patch matrix in the vendor advisory for information about fixes.
http://www.cisco.com/warp/public/707/cisco-sa-20050406-xauth.shtml#software

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20050406-xauth.shtml

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About:
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