Check Point Advisories

Microsoft Edge Scripting Engine Memory Corruption (CVE-2017-8656)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0710
Date Published:	28 Aug 2017
Severity:	High
Last Updated:	Sunday 24 September, 2017
Source:	Microsoft CVE-2017-8656
Industry Reference:	CVE-2017-8656
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Edge on Windows Server 2016 Microsoft Edge on Windows 10 Version 1607 for 32-bit Systems Microsoft Edge on Windows 10 Version 1607 for x64-based Systems Microsoft Edge on Windows 10 Version 1703 for 32-bit Systems Microsoft Edge on Windows 10 Version 1703 for x64-based Systems
Vulnerability Description	An improper initialization of memory vulnerability exists in Chakra, Microsoft Edge's scripting engine. This vulnerability is due to the incorrect initialization of a variable within the DefineUserVars() function due to an error in PreVisitCatch().A remote attacker could exploit this vulnerability by enticing the target user to open a specially crafted web page.

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 Edge Scripting Engine Memory Corruption (CVE-2017-8656) 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 Edge Scripting Engine Memory Corruption (CVE-2017-8656)