Cumulative Security Update for Microsoft Edge (MS16-068)

ITS Advisory Number: 
2016-102
Date(s) Issued: 
Tuesday, June 14, 2016
Subject: 
Cumulative Security Update for Microsoft Edge (MS16-068)
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. Users 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: 
  • 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: 

Multiple vulnerabilities have been discovered in Microsoft Edge that could allow for remote code execution. These include:

  • Four Scripting Engine Memory Corruption vulnerabilities exist in the way Chakra JavaScript engine renders when handling objects in memory (CVE-2016-3199, CVE-2016-3202, CVE-2016-3214, CVE-2016-3222)
  • Two Windows PDF Information Disclosure Vulnerabilities exist when a user opens a specially-crafted .pdf file (CVE-2016-3201, CVE-2016-3215)
  • One Windows PDF Remote Code Execution Vulnerability exists when a user opens a specially-crafted .pdf file (CVE-2016-3203)
  • One Security Feature Bypass vulnerability exists when the Edge Content Security Policy fails to properly validate specially crafted documents (CVE-2016-3198)

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. Users 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.
  • Remind users not to visit untrusted websites or follow links provided by unknown or untrusted sources.
  • Do not open email attachments from unknown or untrusted sources or suspicious emails from trusted sources.