Cisco Security Advisory-
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 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20020207-acs-nds-auth.
-
This section provides details on affected products.
Vulnerable Products
Only Cisco Secure ACS version 3.0.1, configured for NDS, is affected.
Products Confirmed Not Vulnerable
The following are NOT affected by this vulnerability:
-
Systems with Cisco Secure ACS for Windows NT version 2.6 and 2.5 and
earlier
-
Cisco Secure ACS version 3.0.1 that is NOT configured for use with
NDS
-
Cisco Secure ACS for UNIX
No other Cisco products are currently known to be affected by these vulnerabilities.
-
Systems with Cisco Secure ACS for Windows NT version 2.6 and 2.5 and
earlier
-
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.
-
CSCdw46931 -- DEL/ACS authenticates NDS
expired/disabled users.
-
CSCdw46931 -- DEL/ACS authenticates NDS
expired/disabled users.
-
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:
-
Stop both "CSAUTH" and "CSAdmin" services by entering the following
at the command prompt:
net stop CSAuth net stop CSAdmin
-
Locate the <CSNTinstall>/Authenticators directory. For a
default installation on the C:\ drive, the location will be the following:
C:\Program Files\CiscoSecure ACS v3.0\Authenticators\NDSAuth.dll.
-
Rename the original NDSAuth.dll to something else (NDSAuth_old.dll,
for example) to save it.
-
Replace the original NDSAuth.dll file with the patch file in its
place.
-
Restart the services by entering the following at the command
prompt:
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.
-
Stop both "CSAUTH" and "CSAdmin" services by entering the following
at the command prompt:
-
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.
-
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.