Check Point Advisories

Citrix Provisioning Services Opcode 40020010 Stack Buffer Overflow

Vulnerability
Protection

Check Point Reference:	CPAI-2011-373
Date Published:	30 Aug 2011
Severity:	Critical
Last Updated:	Tuesday 30 August, 2011
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A stack buffer overflow vulnerability has been reported in Citrix Provisioning Service. Citrix Provisioning Service facilitates image management for virtual and physical workloads services, by allowing computers to obtain applications from the network in real-time. The vulnerability is due to insufficient validation of incoming data while handling specially crafted packets with Opcode 0x40020010. A remote attacker could trigger this vulnerability by sending malicious messages containing specially crafted data to the Citrix Provisioning Services. Successful exploitation of this vulnerability may allow remote attackers to execute arbitrary code on the target machine within the security context of the service, and may cause the vulnerable server to terminate abnormally

Protection Overview

This protection will detect and block attempts to send such malicious messages 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 Provisioning Services Opcode 40020010 Stack Buffer Overflow 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: Citrix ICA Protection Violation.
Attack Information: Citrix Provisioning Services opcode 40020010 stack buffer overflow