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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
Citrix Advanced Access Control
[CTX111614]
November 16, 2006 18:00 GMT Number R-047
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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.
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VULNERABILITY The risk is LOW. A remote authenticated user may be able to
ASSESSMENT: gain access to resources in violation of configured policies.
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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
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[***** 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
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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
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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
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