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TITLE:
Cisco IOS RADIUS Authentication Security Bypass

SECUNIA ADVISORY ID:
SA15850

VERIFY ADVISORY:
http://secunia.com/advisories/15850/

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:
A vulnerability has been reported in Cisco IOS, which can be
exploited by malicious people to bypass RADIUS authentication.

The vulnerability is caused due to an error in the AAA
(Authentication, Authorization, and Accounting) RADIUS authentication
method making it possible to bypass it by supplying an overly long
username.

Successful exploitation bypasses the RADIUS authentication.

The vulnerability only affects devices running the following version
of Cisco IOS and configured with a RADIUS authentication and a
fallback method to "none" with "local" or no other method in
between:
* 12.2T based trains
* 12.3 based trains
* 12.3T based trains
* 12.4 based trains

SOLUTION:
Fixes are available (see patch matrix in vendor advisory).
http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml#software

Use an additional authentication method other than "local" between
RADIUS authentication and the "none" fallback method.

Remove the "none" fallback method (this may cause problems if the
RADIUS server becomes unavailable).

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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