-
Cisco Secure ACS for Windows is vulnerable to a buffer overflow on the administration service which runs on TCP port 2002. Exploitation of this vulnerability results in a Denial of Service, and can potentially result in system administrator access. Cisco is providing repaired software, and customers are recommended to install patches or upgrade at their earliest opportunity. Workarounds can be implemented, and consist of blocking external access to port 2002 on the ACS.
This issue is documented in Cisco Bug ID CSCea51366. This issue is also being referenced in the Mitre CVE as CAN-2003-0210.
This advisory is available at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20030423-ACS.
-
Vulnerable Products
Cisco Secure ACS versions up to and including version 2.6.4 , 3.0.3, and 3.1.1 are affected by this vulnerability.
Products Confirmed Not Vulnerable
No other Cisco products are affected by this vulnerability. Specifically, Cisco Secure ACS for UNIX is NOT affected by this vulnerability.
-
Cisco Secure ACS for Windows provides a Web-based management interface, termed CSAdmin, which listens on TCP port 2002. A buffer overflow vulnerability occurs during CSAdmin process servicing login requests. Once a sufficiently long user parameter is received by the server, this can cause the buffer overflow, which would typically result in the service hanging until it can be restarted. It is possible that a buffer overflow could be performed that would result in the compromise of the system and permit remote control of the system.
This issue is resolved by applying the patch files to repair the CSAdmin program, and will be repaired in future versions of CSAdmin.
- Bug ID
- CSCea51366
-
It is recommended that customers patch systems, or upgrade to repaired versions of Cisco Secure ACS. Alternatively, the vulnerability can be mitigated by blocking access to the ACS on port 2002, as well as strictly limiting the access to internal hosts that have reason to connect to the ACS. This can be accomplished with access control lists on routers or firewalls.
-
Fixes to the CSAdmin will be included in ACS for Windows versions 3.0.4, 3.1.2, and later, which will become available on the Cisco website. Patch files for 2.6.4, 3.0.3, and 3.1.1 are currently available on the Cisco website. Customers running versions earlier than 2.6.4, 3.0.3, or 3.1.1 will need to upgrade to those versions to apply the patch files.
The patch files that resolve this problem for specific versions are as follows:
- ACS 3.1(1) - CSAdmin-Patch-3.1-1-27.zip (Please follow the "Note" link on the top of the page regarding strong encryption known as 3DES to download this patch)
- ACS 3.0(3) - CSAdmin-Patch-3.0-3-6.zip
- ACS 2.6 - CSAdmin-patch-2.6-4-4.zip
Customers can download these files at: http://www.cisco.com/pcgi-bin/tablebuild.pl/cs-acs-win.
For customers needing the patch for ACS 3.1(1), please select the link titled "Download Access Control Server for Windows Patches (Strong Cryptographic 3DES Software)".
-
The Cisco PSIRT was made aware of this vulnerability by the NSFOCUS Security Team.
Cisco is unaware of malicious use of the vulnerabilities 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.
-
Revision 1.0 2003-April-23 Initial public release. Revision 1.1 2003-April-23 Clarified location of 3.1(1) patch files in "Software Versions and Fixes" section Revision 1.2 2003-May-07 Additional clarification to 3.1.1 patch location
-
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.