Check Point Advisories

Microsoft Internet Explorer JsErrorToString Use-after-free

Vulnerability
Protection

Check Point Reference:	CPAI-2018-0774
Date Published:	30 Jul 2018
Severity:	High
Last Updated:	Monday 30 July, 2018
Source:	Project zero
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft IE
Vulnerability Description	A use-after-free vulnerability exists in Microsoft IE. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system.

Protection Overview

This protection detects 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 Internet Explorer JsErrorToString 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: Microsoft Internet Explorer JsErrorToString Use-after-free