__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Citrix Advanced Access Control [CTX111614] November 16, 2006 18:00 GMT Number R-047 ______________________________________________________________________________ PROBLEM: A vulnerability was reported in Citrix Advanced Access Control. A remote authenticated user can bypass security policy. PLATFORM: Version(s): 4.0, 4.2 DAMAGE: When the Browser-Only access feature is used, the Advanced Access Control implementation may not properly enforce the correct policies on some resources. A remote authenticated user may be able to gain access to resources in violation of configured policies. Also, when a user login occurs in a specific way, the remote authenticated user may be able to gain access to resources in violation of configured policies. SOLUTION: Apply current patches. ______________________________________________________________________________ VULNERABILITY The risk is LOW. A remote authenticated user may be able to ASSESSMENT: gain access to resources in violation of configured policies. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-047.shtml ORIGINAL BULLETIN: http://support.citrix.com/article/CTX111614 ADDITIONAL LINKS: SecurityTracker Alert ID: 1017227 http://securitytracker.com/alerts/2006/Nov/1017227.html ______________________________________________________________________________ [***** Start CTX111614 *****] Vulnerability in Advanced Access Control could result in policy bypass Document ID: CTX111614 Created: Nov 14, 2006 Updated: Nov 14, 2006 Products: Advanced Access Control 4.0, Advanced Access Control 4.2 Login now to access: - Developer and Learning Centers - Tools and Community uploads - Hotfix and Security Alerts - and more! Sign up, it's free! Click for a printer friendly version of this document Printer Friendly Rate this Document Rate this Document Rating: Not Rated Severity: Medium Description of Problem When using Advanced Access Control, users that login in a specific way may be able to gain access to resources in violation of configured policies. This vulnerability is present in: • Access Gateway 4.2 with Advanced Access Control 4.2 (currently known as Access Gateway 4.2 Advanced Edition) • Advanced Access Control Option 4.0 (previously Access Gateway Enterprise 4.0) Access Gateway Standard Edition and Access Gateway Enterprise Edition are not vulnerable to this issue. What Customers Should Do A hotfix has been released to address this issue. Citrix recommends that affected customers install the hotfix which can be downloaded from the following locations: Advanced Access Control Option 4.0: EN - http://support.citrix.com/article/CTX110293 FR - http://support.citrix.com/article/CTX111605 GE - http://support.citrix.com/article/CTX111603 JA - http://support.citrix.com/article/CTX111606 ES - http://support.citrix.com/article/CTX111604 Access Gateway 4.2 Advanced Edition: EN - http://support.citrix.com/article/CTX110439 FR - http://support.citrix.com/article/CTX111609 GE - http://support.citrix.com/article/CTX111607 JA - http://support.citrix.com/article/CTX111610 ES - http://support.citrix.com/article/CTX111608 What Citrix Is Doing Citrix is proactively notifying customers and channel partners about this potential security issue. An article containing the information in this bulletin is available from the Citrix Knowledge Base at http://support.citrix.com/. Obtaining Support on this Issue If you require technical assistance with this issue, please contact Citrix Technical Support. Information for contacting Citrix Technical Support is available at http://support.citrix.com/. Reporting Security Vulnerabilities to Citrix Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities very seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com containing the exact version of the product in which the vulnerability was found and steps to reproduce the vulnerability. [***** End CTX111614 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Security Tracker 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. 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