Security Update for Internet Explorer (MS16-063)

ITS Advisory Number: 
2016-106
Date(s) Issued: 
Tuesday, June 14, 2016
Subject: 
Security Update for Internet Explorer (MS16-063)
Overview: 

This security update resolves vulnerabilities in Internet Explorer. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. 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: 
  • Internet Explorer 11
  • Internet Explorer 10
  • Internet Explorer 9
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: 

The security update addresses the following vulnerabilities:

  • Five Scripting Engine Memory Corruption vulnerabilities exist in the way Jscript engines render when handling objects (CVE-2016-3202, CVE-2016-3205, CVE-3206, CVE-2016-3207, CVE-2016-3210)
  • Three Microsoft Internet Explorer Memory Corruption vulnerabilities exist when Internet Explorer improperly access objects in memory (CVE-2016-0199, CVE-2016-0200, CVE-2016-3211)
  • One Internet Explorer XSS Filter vulnerability exists when XSS Filter does not properly validate JavaScript (CVE-2016-3212)
  • One WPAD Elevation of Privilege vulnerability (CVE-2016-3213)

The most severe of these vulnerabilities could allow an attacker to execute remote code by luring a victim to visit a specially crafted malicious website. When the website is visited, the attacker's script will run within the context of the affected browser or with the same permissions as the affected user account. 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.

Actions: 
  • After appropriate testing, apply appropriate patches provided by Microsoft to vulnerable systems immediately.
  • 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 websites or follow links provided by unknown or untrusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from untrusted sources.