Check Point Advisories

Citrix Provisioning Services streamprocess.exe Stack Buffer Overflow

Vulnerability
Protection

Check Point Reference:	CPAI-2011-250
Date Published:	15 May 2011
Severity:	High
Last Updated:	Sunday 15 May, 2011
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Citrix Provisioning Service allows computers to obtain application from the network in real-time. Administrators can prepare a master device for imaging purposes by creating a vDisk image that would be stored on a Provisioning Server. Then, this vDisk would be used by devices to boot directly from the network. A stack buffer overflow vulnerability has been reported in Citrix Provisioning Service. The vulnerability is due to a boundary error when handling a specially crafted packet to the Provisioning Services server. A remote attacker could exploit this issue by sending a malicious packets to the target service. 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 specially crafted packets sent to the Provisioning Services 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 streamprocess.exe 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: Application Servers Protection Violation.
Attack Information: Citrix Provisioning Services streamprocess.exe stack buffer overflow