Technical Description

A vulnerability has been identified in Cisco Secure Access Control Server (ACS), which could be exploited by malicious users to obtain sensitive information. This flaw is due to a design error where the application encrypts (using the Crypto API MS Base Cryptographic Provider v1.0) and stores (in the Windows registry) the passwords of ACS administrators and the locally generated master key designed to encrypt/decrypt these passwords, which could be exploited by local or remote attackers with administrative access to the Windows registry to decrypt to obtain the clear-text passwords for all ACS administrators and gain access to network devices configured to use Cisco Secure ACS for authentication.

Affected Products

Cisco Secure Access Control Server (ACS) versions 3.x for Windows

Solution

Restrict access to the registry key "HLM\SOFTWARE\Cisco\CiscoAAAv3.3\CSAdmin\Administrators" :
http://support.microsoft.com/kb/q153183

References

http://www.vupen.com/english/advisories/2006/1741
http://www.frsirt.com/english/reference/11473
http://www.cisco.com/warp/public/707/cisco-sr-20060508-acs.shtml

Credits

Vulnerability reported by Andreas Junestam

ChangeLog

2006-05-09 : Initial release

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