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Cisco Products TACACS+ Authentication Bypass
Secunia Advisory:	SA18904	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2006-02-16
Last Update:	2006-02-23
Popularity:	5,947 views

Critical:	Less critical
Impact:	Security Bypass
Where:	From remote
Solution Status:	Vendor Patch

OS:	Cisco Guard 5.x Cisco Traffic Anomaly Detector 5.x

Software:	Cisco Catalyst 6500/Cisco 7600 Router Anomaly Guard Module Cisco Catalyst 6500/Cisco 7600 Router Traffic Anomaly Detector Module

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2006-0764

Description: A security issue has been reported in various Cisco products, which can be exploited by malicious people to bypass certain security restrictions. The security issue is caused due to an error in TACACS+ (Terminal Access Controller Access Control System Plus) and can be exploited to bypass the user authentication and gain unauthorized access to the devices. Successful exploitation requires that TACACS+ authentication is incompletely configured (i.e. the AAA command specifies TACACS+ authentication, but the configuration lacks the "tacacs-server host" command). The security issue affects the following products: * Cisco Guard versions 5.0(1) and 5.0(3) * Cisco Traffic Anomaly Detector versions 5.0(1) and 5.0(3) * Anomaly Guard Module for the Cisco Catalyst 6500 switches/Cisco 7600 routers * Traffic Anomaly Detector Module for the Cisco Catalyst 6500 switches/Cisco 7600 routers NOTE: Versions prior to 5.0 and versions later than 5.0(3) are unaffected. Solution: Update to version 5.1(4) or later. Software for the Cisco Guard appliance: http://www.cisco.com/pcgi-bin/tablebuild.pl/cisco-ga-crypto. Software for the Cisco Traffic Anomaly Detector appliance: http://www.cisco.com/pcgi-bin/tablebuild.pl/cisco-ad-crypto. Software for the Cisco Anomaly Guard Module: http://www.cisco.com/pcgi-bin/tablebuild.pl/cisco-agm-crypto. Software for the Cisco Anomaly Traffic Detector Module: http://www.cisco.com/pcgi-bin/tablebuild.pl/cisco-adm-crypto Configure TACACS+ authentication properly. Provided and/or discovered by: The vendor credits Gerrit Wenig. Changelog: 2006-02-23: Added CVE reference. Original Advisory: http://www.cisco.com/warp/public/707/cisco-sa-20060215-guard.shtml

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