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

  • CTX127613
  • Created On  Dec 14, 2010
  • Updated On  Mar 10, 2012
  • 3 found this helpful
  • Security Bulletin

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.


Citrix thanks George Gal of VSR ( 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

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

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 stating the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability

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