Cumulative Security Update for Internet Explorer (MS16-144)

ITS Advisory Number: 
2016-207
Date(s) Issued: 
Tuesday, December 13, 2016
Subject: 
Cumulative Security Update for Internet Explorer (MS16-144)
Overview: 

Multiple vulnerabilities have been discovered in Microsoft Internet Explorer, the most severe of which could allow remote code execution if a user views a specially crafted web page. 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: 
  • Internet Explorer 9

  • Internet Explorer 10

  • Internet Explorer 11

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: 

Microsoft Internet Explorer is prone to multiple vulnerabilities that could allow remote code execution. The vulnerabilities are as follows:

  • Two remote code execution vulnerabilities exist when Microsoft Browsers improperly access objects in memory. (CVE-2016-7279, CVE-2016-7283)

  • Three information disclosure vulnerabilities exist in the way Internet Explorer handle objects in memory. (CVE-2016-7278, CVE-2016-7282, CVE-2016-7284)

  • A security feature bypass vulnerability exists when the Microsoft Browsers fails to correctly apply Same Origin Policy for scripts running inside Web Workers. (CVE-2016-7281)

  • Two remote code execution vulnerabilities exist in the way affected Microsoft scripting engines render when handling objects in memory in Microsoft browsers. (CVE-2016-7202, CVE-2016-7287)

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. If the current user is logged on with administrative user rights, an attacker could take control of an affected system. 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, install updates provided by Microsoft to the vulnerable systems.
  • 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.
  • Apply the principle of Least Privilege to all systems and services.