Cumulative Security Update for Microsoft Edge (MS16-085)

ITS Advisory Number: 
2016-114
Date(s) Issued: 
Tuesday, July 12, 2016
Subject: 
Cumulative Security Update for Microsoft Edge (MS16-085)
Overview: 

Multiple vulnerabilities have been discovered in Microsoft Edge that could allow for remote code execution. Microsoft Edge replaced Internet Explorer as the default browser on Windows 10. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Systems Affected: 
  • Windows 10

  • Windows 10 (Version 1511)

RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

Multiple vulnerabilities have been discovered in Microsoft Edge that could allow for remote code execution. Details of these vulnerabilities are as follows:

  • A Security Feature Bypass exists when Microsoft Edge does not properly implement Address Space Layout Randomization (ASLR).  (CVE-2016-3244)

  • Two Memory Corruption Vulnerabilities exists when Microsoft Edge improperly accesses objects in memory. (CVE-2016-3246, CVE-2016-3264)

  • Five Scripting Engine Memory Corruption Vulnerabilities exist in the way that the Chakra JavaScript engine renders when handling objects in memory in Microsoft Edge.  (CVE-2016-3248, CVE-2016-3259, CVE-2016-3260, CVE-2016-3265, CVE-2016-3269)

  • A Scripting Engine Information Disclosure Vulnerability exists when VBScript improperly discloses the contents of its memory, which could provide an attacker with information to further compromise the user's computer or data. (CVE-2016-3271)

  • A Microsoft Browser Information Disclosure Vulnerability exists when the Microsoft Browser XSS Filter does not properly validate content under specific conditions. (CVE-2016-3273)

  • A Microsoft Browser Spoofing Vulnerability exists when a Microsoft browser does not properly parse HTTP content. (CVE-2016-3274)

  • A Microsoft Browser Spoofing Vulnerability exists when the Microsoft Browser in reader mode does not properly parse HTML content. (CVE-2016-3276)

  • A Microsoft Browser Information Disclosure Vulnerability exists when the Microsoft Browser improperly handles objects in memory. (CVE-2016-3277)

 

Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. 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.

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.

  • Apply the principle of Least Privilege to all systems and services.

  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.

Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments, especially those from un-trusted sources.