Specific versions of Cisco Secure Authentication Control Server (ACS) allows authentication of users that have been explicitly disabled or expired in the Novell Directory Services (NDS). There is a software patch that may be applied, and software upgrades will also address this problem. The complete notice will be available at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20020207-acs-nds-auth.
Specific versions of Cisco Secure Authentication Control Server (ACS) allows authentication of users that have been explicitly disabled or expired in the Novell Directory Services (NDS). There is a software patch that may be applied, and software upgrades will also address this problem.
The complete notice will be available at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20020207-acs-nds-auth.
This section provides details on affected products.
Only Cisco Secure ACS version 3.0.1, configured for NDS, is affected.
The following are NOT affected by this vulnerability:
No other Cisco products are currently known to be affected by these vulnerabilities.
To determine if your Cisco Secure ACS for Windows NT server is configured for NDS, please review the "External User Databases/Unknown User Policy" on the Administration interface. If the name of your NDS configuration appears in the "Selected Databases" list, then you are using NDS for authentication and are affected by this vulnerability if you are running version 3.0.1.
Users who are marked as "expired" or "disabled" on the NDS database will still authenticate if their credentials are otherwise correct. The file "NDSAuth.DLL" is a module which allows ACS authentication to be handled by an external NDS server. Versions of this file with the date 2001-Dec-15 ignore the "Disabled" or "Expired" state of these users on NDS. Authentication attempts by users with a Disabled or Expired status on the NDS server should be refused, but are permitted due to this vulnerability.
This vulnerability is documented in Cisco Bug ID CSCdw46931.
If you are unable to install the patch, user records that are "disabled" or "expired" in your NDS database should be temporarily removed until they are either valid again or the patch has been installed.
Install the patch according to the following directions:
net stop CSAuth net stop CSAdmin
net start CSAuth net start CSAdmin
The patch is a single file and can be downloaded at the following location if you are logged in with a valid CCO user account: http://www.cisco.com/pcgi-bin/tablebuild.pl/cs-acs-win.
CiscoSecure ACS for Windows NT Server version 3.0.1 is vulnerable and can be patched. Future versions of the software will include this patch. Please review the Workarounds section of this notice for detailed patch installation instructions.
The patch for this vulnerability can be downloaded from the following location if you are logged in with a valid CCO user account: http://www.cisco.com/pcgi-bin/tablebuild.pl/cs-acs-win
This vulnerability was discovered by internal Quality Assurance.
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Revision 1.0 |
2002-February-07 |
Initial public release. |
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