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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0047
       Vulnerability in Citrix Access Gateway legacy authentication
                 support could result in command injection
                              17 January 2011

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Citrix Access Gateway 4.5 Advanced Edition
                   Citrix Access Gateway 4.5 Standard Edition
                   Citrix Access Gateway 4.6 Advanced Edition
                   Citrix Access Gateway 4.6 Standard Edition
                   Citrix Access Gateway 8.0 Enterprise Edition
                   Citrix Access Gateway 8.1 Enterprise Edition
                   Citrix Access Gateway 9.0 Enterprise Edition
                   Citrix Access Gateway 9.1 Enterprise Edition
                   Citrix Access Gateway 9.2 Enterprise Edition
                   Citrix Access Gateway VPX 4.6
Publisher:         Citrix
Operating System:  Network Appliance
Impact/Access:     Root Compromise -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2010-4566  

Original Bulletin: 
   http://support.citrix.com/article/CTX127613

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Vulnerability in Citrix Access Gateway legacy authentication support could 
result in command injection

Document ID: CTX127613   /   Created On: 14-Dec-2010   /   Updated On: 
13-Jan-2011

Average Rating: 3 (2 ratings)

Severity: High

Description of Problem

A vulnerability has been identified in the NT4 authentication component of 
Access Gateway Enterprise, and the NTLM authentication component of Access 
Gateway Standard Edition that, when exploited, could allow an attacker to 
subvert the authentication process. In some cases, this could result in the 
attacker being able to execute commands on the appliance in the context of
the root user.

This vulnerability only affects Access Gateway customers that are using the 
authentication methods specified above.

The vulnerable components are present in all versions of Access Gateway 
Enterprise Edition prior to version 9.2-49.8, and all versions of the Access 
Gateway Standard and Advanced Editions prior to Access Gateway 5.0.

What Customers Should Do

The use of the vulnerable authentication methods has been deprecated in the 
Access Gateway product line, and support for these methods has also been 
removed from the latest versions of these products.

Citrix recommends that affected customers review their use of the deprecated 
components, and migrate to another authentication method.

Acknowledgements

Citrix thanks George Gal of VSR (http://www.vsecurity.com/) for working with 
us to protect Citrix customers

What Citrix Is Doing

Citrix is notifying customers and channel partners about this potential 
security issue. This article is also available from the Citrix Knowledge 
Center at http://support.citrix.com/.

Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix 
Technical Support. Contact details for Citrix Technical Support are available 
at http://www.citrix.com/site/ss/supportContacts.asp.

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any 
and all potential vulnerabilities seriously. If you would like to report a 
security issue to Citrix, please compose an e-mail to secure@citrix.com stating 
the exact version of the product in which the vulnerability was found and the 
steps needed to reproduce the vulnerability

This document applies to:

    * Access Gateway 4.5 Advanced Edition
    * Access Gateway 4.5 Standard Edition
    * Access Gateway 4.6 Advanced Edition
    * Access Gateway 4.6 Standard Edition
    * Access Gateway 8.0 Enterprise Edition
    * Access Gateway 8.1 Enterprise Edition
    * Access Gateway 9.0 Enterprise Edition
    * Access Gateway 9.1 Enterprise Edition
    * Access Gateway 9.2 Enterprise Edition
    * Access Gateway VPX 4.6

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