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TITLE:
Cisco IOS Authentication Proxy for FTP/Telnet Buffer Overflow

SECUNIA ADVISORY ID:
SA16719

VERIFY ADVISORY:
http://secunia.com/advisories/16719/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

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

DESCRIPTION:
A vulnerability has been reported in Cisco IOS, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
potentially compromise a vulnerable system.

The vulnerability is caused due to a boundary error when the
Authentication Proxy FTP/Telnet is processing user authentication
credentials. This can be exploited to cause a buffer overflow.

Successful exploitation causes a reload of the device and may allow
arbitrary code execution, but requires that Authentication Proxy for
FTP and/or Telnet Sessions is configured and applied to an active
interface.

The vulnerability is reported in the following versions:
* 12.2ZH and 12.2ZL based trains
* 12.3 based trains
* 12.3T based trains
* 12.4 based trains
* 12.4T based trains

SOLUTION:
Fixes are available (see patch matrix in vendor advisory).
http://www.cisco.com/warp/public/707/cisco-sa-20050907-auth_proxy.shtml#software

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20050907-auth_proxy.shtml

OTHER REFERENCES:
US-CERT VU#236045:
http://www.kb.cert.org/vuls/id/236045

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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.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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