__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Cisco Secure ACS for UNIX Cross Site Scripting Vulnerability [Document ID: 70471] June 15, 2006 22:00 GMT Number Q-231 ______________________________________________________________________________ PROBLEM: Cisco Secure ACS for UNIX is vulnerable to Cross Site Scripting attacks via both HTML GET and POST requests. PLATFORM: Cisco Secure Access Control Server (ACS) for Unix DAMAGE: 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: Apply current patches. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. A remote attacker could gain administrative ASSESSMENT: privileges. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-231.shtml ORIGINAL BULLETIN: http://www.cisco.com/en/US/products/sw/secursw/ps4911/tsd_products_security_response09186a00806b8bdb.html ______________________________________________________________________________ [***** Start Document ID: 70471 *****] Cisco Secure Access Control Server for Unix Cisco Security Response to: Cisco Secure ACS for UNIX Cross Site Scripting Vulnerability Downloads Cisco Security Response to: 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) Contents Cisco Response Additional Information Revision History Cisco Security Procedures 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 (registered customers only) 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 1.0 2006-June-15 Initial 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. Updated: Jun 15, 2006 Document ID: 70471 [***** End Document ID: 70471 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Cisco for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) Q-221: Vulnerability in Microsoft JScript Q-222: Vulnerability in Windows Media Player Q-223: Vulnerability in Routing and Remote Access Q-224: Vulnerability in Microsoft PowerPoint Q-225: Vulnerability in Microsoft Exchange Server Running Outlook Web Access Q-226: Vulnerability in Server Message Block Q-227: Vulnerability in RPC Mutual Authentication Q-228: Vulnerability in TCP/IP Q-229: horde3 -- Missing Input Sanitising Q-230: kernel-source-2.4.27 -- Several Vulnerabilities