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Cisco IOS Firewall Authentication Proxy Buffer Overflow Vulnerability


Date Discovered

Cisco IOS Firewall Authentication Proxy is prone to a buffer overflow condition. Successful exploitation of this issue could cause a denial of service or potential execution of arbitrary code.

Symantec Enterprise Security Manager Network Assessment Module

Symantec Enterprise Security Manager Network Assessment Module detects and reports this vulnerability. Click here for the advisory released December 22, 2005.

Block external access at the network boundary, unless service is required by external parties.
To exploit this vulnerability, an attacker must be able to establish a TCP connection to the affected device. Block external access to the device if possible. Only allow connections from trusted hosts and networks.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Intrusion detection systems may detect attempts to exploit this and other latent vulnerabilities across the network. Examine IDS logs regularly for signs of attempted exploitation.

Cisco has released a security advisory and fixes to address this issue. Please see the referenced advisory for information on obtaining firmware updates from Cisco.

Source: Cisco IOS Software
URL: http://www.cisco.com/public/sw-center/sw-ios.shtml

Source: Cisco Security Advisory: Cisco IOS Firewall Authentication Proxy for FTP and Tel
URL: http://www.cisco.com/warp/public/707/cisco-sa-20050907-auth_proxy.shtml

Announced by the vendor.

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