Cumulative Security Update for Microsoft Edge (MS15-107)

ITS Advisory Number: 
2015-124
Date(s) Issued: 
Tuesday, October 13, 2015
Subject: 
Cumulative Security Update for Microsoft Edge (MS15-107)
Overview: 

This security update resolves vulnerabilities in Microsoft Edge.  Microsoft Edge is a web browser included with Windows 10. The most severe of the vulnerabilities could allow information disclosure if a user views a specially crafted webpage using Microsoft Edge. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

Systems Affected: 
  • Microsoft Windows 10
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
High
Description: 

Vulnerabilities exist in Microsoft Edge due to the way objects in memory are accessed and the cross-site scripting bypass existence. The vulnerabilities are as follows:

  • Microsoft Edge Information Disclosure Vulnerability - CVE-2015-6057
  • Microsoft Edge XSS Filter Bypass - CVE-2015-6058

These vulnerabilities could provide an attacker with information to further compromise the device or allow disabled scripts to run with the wrong security context. Successful exploitation of these vulnerabilities could result in an attacker gaining the same rights as the current user. If the current user is logged on with administrative user rights an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Actions: 
  • After appropriate testing, apply appropriate patches provided by Microsoft to vulnerable systems.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit untrusted websites or follow links provided by unknown or untrusted sources.