Check Point Advisories

Citrix XenApp and XenDesktop XML Service Interface Code Execution

Vulnerability
Protection

Check Point Reference:	CPAI-2011-558
Date Published:	6 Dec 2011
Severity:	Critical
Last Updated:	Tuesday 24 January, 2012
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A remote code execution vulnerability has been reported in Citrix XenApp and XenDesktop server. The vulnerability is due to an error in the way the application processes invalid URIs. A remote attacker could exploit this vulnerability by sending a malicious packet to the target service. Successful exploitation could result in arbitrary code execution, in the security context of the affected service account.

Protection Overview

This protection will detect and block the transferring of specially crafted HTTP POST requests to the server.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Citrix XenApp and XenDesktop XML Service Interface Code Execution protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Application Servers Protection Violation.
Attack Information: Citrix XenApp and XenDesktop XML service interface uninitialized pointer