Cumulative Security Update for Internet Explorer (MS16-095)

ITS Advisory Number: 
2016-129
Date(s) Issued: 
Tuesday, August 9, 2016
Subject: 
Cumulative Security Update for Internet Explorer (MS16-095)
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. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full 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:

  • Five memory corruption vulnerabilities exist when Internet Explorer improperly accesses objects in memory (CVE-2016-3288,  CVE-2016-3289, CVE-2016-3290, CVE-2016-3293, CVE-2016-3322)
  • Two information disclosure vulnerabilities exist when Internet Explorer improperly handles page content (CVE-2016-3321, CVE-2016-3329)
  • Two information disclosure vulnerabilities exist when Internet Explorer improperly handles objects in memory (CVE-2016-3326, CVE-2016-3327)

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, apply appropriate patches provided by Microsoft to 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.
  • Remind users not to visit websites or follow links provided by unknown or untrusted sources.