Description of Problem
A vulnerability has been identified in Citrix Secure Gateway that could result in a denial of service.
When a specific request is made to the Secure Gateway service from a remote attacker, the Secure Gateway service can be made to consume 100% of the available CPU and may refuse further connections.
This vulnerability is present in all versions of Citrix Secure Gateway up to and including version 3.1.
Please note that the Citrix Access Gateway appliance is not affected by this vulnerability when configured to act as a Citrix Secure Gateway.
What Customers Should Do
A hotfix has been released to address this issue. Citrix recommends that customers using Secure Gateway install this hotfix, which can be downloaded from the following locations:
Citrix Secure Gateway 3.1:
Citrix Secure Gateway 3.0:
Citrix would like to thank the Qualys Vulnerability Research team (http://www.qualys.com/research/) 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 firstname.lastname@example.org stating the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability