Check Point Advisories

Microsoft Windows Large Image Resize DoS

Vulnerability
Protection

Check Point Reference:	CPAI-2004-167
Date Published:	14 Feb 2010
Severity:	High
Last Updated:	Sunday 14 February, 2010
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	While rendering a normal image with excessively large resizing parameters in an HTML page, numerous applications could cause a infinite loop in the FrameBuffer display driver of Windows and eventually crash the system, leading to a Denial of Service condition. When a malicious document is received and rendered, the target system will stop responding to user input (e.g. mouse movement, keyboard input, etc.) for a period of time. Windows systems might crash and reboot or hang when the system watchdog detects an infinite loop in the framebuf system driver.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

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 Microsoft Windows Large Image Resize DoS 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: Web Client Enforcement Violation.
Attack Information: Microsoft Windows large image resize DoS