Severity: High
Description of Problem
The Citrix Presentation Server Client for Windows includes support for making ICA connections through proxy servers. An implementation flaw in this functionality may allow an attacker to execute arbitrary code in the context of the client process.
This vulnerability could potentially be exploited by any malicious Web site visited by the user. This vulnerability is likely to be exploitable in most client deployments.
This vulnerability is present in versions 9.230 and earlier of the Citrix Presentation Server Client for Windows.
What Customers Should Do
This vulnerability has been addressed in the Citrix Presentation Server Client for Windows version 10.0 and later. Citrix strongly recommends that customers upgrade their Citrix Presentation Server Client for Windows to version 10.0 and later. These upgrades can be obtained from the following location:
http://www.citrix.com/English/SS/downloads/downloads.asp?dID=2755
To accommodate customers who are unable to immediately move to Citrix Presentation Server Client for Windows version 10.0, a limited release version of the older client containing a fix for this issue is also available. This version of the client (9.237) will provide a temporary work-around until version 10.0 can be deployed. Please refer to the following Knowledge Base article for further information:
http://support.citrix.com/article/CTX112669
Acknowledgements
Citrix thanks Karl Lynn of
Juniper Networks for reporting this issue and working with us to protect 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
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 the steps needed to reproduce the vulnerability.
Source
Linear Mode
