Check Point Advisories

Microsoft Edge Call_RegEx_Symbol_Function Return Type

Vulnerability
Protection

Check Point Reference:	CPAI-2018-0145
Date Published:	27 Feb 2018
Severity:	Medium
Last Updated:	Tuesday 27 February, 2018
Source:	Project Zero
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Edge 41.16299.15.0.
Vulnerability Description	A Type Confusion vulnerability exists in Microsoft Edge. The vulnerability is that JavaScript regex function doesn't check the return type. Successful exploitation of this vulnerability can achieve Remote Code Execution.

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 Call_RegEx_Symbol_Function Return Type 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 Call_RegEx_Symbol_Function Return Type