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                                    CERT-Renater

                         Note d'Information No. 2006/VULN345
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DATE                      : 16/06/2006

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Unix running Cisco Secure ACS.

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Cisco Security Response: Cisco Secure ACS for UNIX Cross Site
Scripting Vulnerability

Document ID: 70471

http://www.cisco.com/warp/public/707/cisco-sr-20060615-acs.shtml

Revision 1.0

For Public Release 2006 June 15 1700 UTC (GMT)

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Contents
========

     Cisco Response
     Additional Information
     Revision History
     Cisco Security Procedures

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Cisco Response
==============

This is Cisco PSIRT response to the statements made by Fujitsu
Services Limited in their advisory, posted on June 15, 2006 to
several external mailing lists.

This vulnerability is addressed by Cisco Bug ID:

   * CSCsd50560 ACS LogonProxy.cgi vulnerable to Cross Site
                Scripting attacks.

We would like to thank Thomas Liam Romanis and Fujitsu Services
Limited for reporting this vulnerability to us.

We greatly appreciate the opportunity to work with researchers on
security vulnerabilities, and welcome the opportunity to review and
assist in product reports.

Additional Information
======================

Cisco Secure Access Control Server (ACS) is a centralized user access
control framework. Cisco Secure ACS offers centralized command and
control for all user authentication, authorization, and accounting
(AAA pronounced "triple A") services to network devices that function
as AAA clients.

Cisco Secure ACS for UNIX LogonProxy.cgi is vulnerable to Cross Site
Scripting (XSS) attacks via both HTML GET and POST requests.

This vulnerability affects only Cisco Secure ACS for Unix.

Cisco Secure ACS for Windows and Cisco Secure ACS Solution Engine are
not affected.

This vulnerability could be used to redirect the ACS administrative
users to another host which could be used to proxy login requests
back to the bona fide ACS server while harvesting administrative user
credentials.

Solution
+-------

Download and apply patch for CSCsd50560, which is located on
Cisco.com at:

http://www.cisco.com/pcgi-bin/tablebuild.pl/cspatchunix-3des.

Instructions for applying the patch are found at the same location.

The following best practices will help mitigate the risks of this
vulnerability:

   * Ensure that only IP addresses of trusted administrator hosts can
     access the Cisco Secure ACS server.
   * Prevent access to the web component of the ACS server over the
     Internet.

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.

Revision History
================

+---------------------------------------+
| Revision |              | Initial     |
| 1.0      | 2006-June-15 | public      |
|          |              | release.    |
+---------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
This includes instructions for press inquiries regarding Cisco
security notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.

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