Check Point Advisories

Google Chrome blink buildShadowAndInstanceTree Use After Free (CVE-2015-1256)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0850
Date Published:	15 Jul 2015
Severity:	High
Last Updated:	Thursday 16 July, 2015
Source:	Google 478549
Industry Reference:	CVE-2015-1256
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Google Chrome prior to 43.0.2357.65
Vulnerability Description	A use-after-free vulnerability exists in Google Chrome, blink component. The vulnerability is due to error when building a shadow tree for a element with a direct reference to a disallowed element. A remote attacker could exploit this vulnerability by enticing a user to open a malicious webpage. Successful exploitation could result in code execution in the context of the currently logged in user.

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 Google Chrome blink buildShadowAndInstanceTree Use After Free 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: Google Chrome blink buildShadowAndInstanceTree Use After Free