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Vulnerability of Cisco Secure Access Control System: bypassing TACACS+ authentication

Synthesis of the vulnerability 

When Cisco Secure Access Control System is configured with a TACACS+ authentication based on data stored in a LDAP directory, an attacker can bypass the authentication, in order to log in as a valid user.
Impacted systems: Secure ACS.
Severity of this alert: 3/4.
Creation date: 07/11/2012.
Références of this alert: BID-56433, CERTA-2012-AVI-634, cisco-sa-20121107-acs, CSCuc65634, CVE-2012-5424, VIGILANCE-VUL-12119.

Description of the vulnerability 

The Cisco Secure Access Control System product supports RADIUS and TACACS+ authentications. User's credentials can be stored in an external server, such as a LDAP server, an Active Directory, etc.

In the TACACS+ with LDAP configuration, passwords are not correctly filtered. An attacker, who knows a valid user name, can then enter a special password, in order to successfully authenticate.

When Cisco Secure Access Control System is configured with a TACACS+ authentication based on data stored in a LDAP directory, an attacker can therefore bypass the authentication, in order to log in as a valid user.
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This vulnerability announce impacts software or systems such as Secure ACS.

Our Vigil@nce team determined that the severity of this cybersecurity threat is important.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer threat bulletin.

Solutions for this threat 

Cisco Secure Access Control System: corrected versions.
The following versions are corrected:
  5.2 Patch 11
  5.3 Patch 7
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