Archive: Vulnerabilities in Access Gateway Advanced Edition could result in information disclosure and session hijacking

  • CTX113814
  • Created onJul 19, 2007
  • Updated onOct 08, 2014
Security Bulletin Severity Medium

This article is no longer maintained, its content refers to a discontinued product and may be out of date. Refer to the Discontinued Product Lifecycle or Active Citrix Product pages for more information on support schedules

Description of Problem

When using Access Gateway Advanced Edition, residual information left on the client device could allow an attacker to gain unauthorized access to a user’s active session.

This vulnerability is present in all versions of Access Gateway Advanced Edition up to and including version 4.5.

What Customers Should Do

This vulnerability has been addressed in Access Gateway Advanced Edition 4.5 HF1.

Due to this and other issues (listed below), Citrix strongly recommends that customers upgrade their Access Gateway appliance to firmware version 4.5.5 and upgrade to Access Gateway Advanced Edition 4.5 HF1. These upgrades can be obtained from the following locations:

Access Gateway Appliance firmware 4.5.5:


Advanced Access Control HF1:


Related Bulletins

For information on bulletins related to this issue, please see the Citrix Support website:


Citrix thanks Martin O’Neal of Corsaire and Cyrill Brunschwiler of Compass Security Network Computing AG for working with us to protect Citrix customers.

What Citrix Is Doing

Citrix is proactively notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Base at

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

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

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