Cisco Secure Access Control System security bypass

cisco-acs-sec-bypass (79860) The risk level is classified as MediumMedium Risk

Description:

Cisco Secure Access Control System (ACS) could allow a remote attacker to bypass security restrictions, caused by improper validation of the user-supplied password when TACACS+ is the authentication protocol. If the application is configured with a Lightweight Directory Access Protocol (LDAP) external identity store, an attacker could exploit this vulnerability to impersonate a user to bypass TACACS+ based authentication service.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Refer to cisco-sa-20121107-acs for patch, upgrade or suggested workaround information. See References.

References:

  • cisco-sa-20121107-acs: Cisco Secure Access Control System TACACS+ Authentication Bypass Vulnerability .
  • BID-56433: Cisco Secure Access Control System (ACS) CVE-2012-5424 Authentication Bypass Vulnerability
  • CVE-2012-5424: Cisco Secure Access Control System (ACS) 5.x before 5.2 Patch 11 and 5.3 before 5.3 Patch 7, when a certain configuration involving TACACS+ and LDAP is used, does not properly validate passwords, which allows remote attackers to bypass authentication by sending a valid username and a crafted password string, aka Bug ID CSCuc65634.
  • OSVDB ID: 87251: Cisco Secure ACS TACACS+ Authentication Protocol Password Validation Bypass
  • SA51194: Cisco Secure Access Control System Security Bypass Vulnerability

Platforms Affected:

  • Cisco Secure ACS 5.0
  • Cisco Secure ACS 5.1
  • Cisco Secure ACS 5.2
  • Cisco Secure ACS 5.3

Reported:

Nov 07, 2012

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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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