Operating System:

[Win]

Published:

13 January 2016

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0073
         MS16-001 Cumulative Security Update for Internet Explorer
                              13 January 2016

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Internet Explorer
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Increased Privileges            -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-0005 CVE-2016-0002 

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-001

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MS16-001 Cumulative Security Update for Internet Explorer (3124903)

Document Metadata

Bulletin Number: MS16-001

Bulletin Title: Cumulative Security Update for Internet Explorer

Severity: Critical

KB Article: 3124903

Version: 1.0

Published Date: January 12, 2016

Executive Summary

This security update resolves vulnerabilities in Internet Explorer. The more 
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 this vulnerability could gain the same user rights as 
the current user. If the current user is logged on with administrative user 
rights, an attacker who successfully exploited this vulnerability 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.

Affected Software

Internet Explorer 7

Internet Explorer 8

Internet Explorer 9

Internet Explorer 10

Internet Explorer 11

Vulnerability Information

Scripting Engine Memory Corruption Vulnerability CVE-2016-0002

A remote code execution vulnerability exists in the way that the VBScript 
engine renders when handling objects in memory in Internet Explorer. The 
vulnerability could corrupt memory in such a way that an attacker could 
execute arbitrary code in the context of the current user.

In a web-based attack scenario, an attacker could host a specially crafted 
website that is designed to exploit the vulnerability through Internet 
Explorer and then convince a user to view the website. An attacker could also
embed an ActiveX control marked "safe for initialization" in an application or
Microsoft Office document that hosts the IE rendering engine. The attacker 
could also take advantage of compromised websites, and websites that accept or
host user-provided content or advertisements. These websites could contain 
specially crafted content that could exploit the vulnerability.

An attacker who successfully exploited the vulnerability could gain the same 
user rights as the current user. If the current user is logged on with 
administrative user rights, an attacker who successfully exploited the 
vulnerability 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.

The update addresses the vulnerability by modifying how the VBScript scripting
engine handles objects in memory.

The following table contains links to the standard entry for each 
vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title					CVE number 	Publicly disclosed	Exploited

Scripting Engine Memory Corruption Vulnerability 	CVE-2016-0002 	No			No

Internet Explorer Elevation of Privilege Vulnerability CVE-2016-0005

An elevation of privilege vulnerability exists when Internet Explorer does not
properly enforce cross-domain policies, which could allow an attacker to 
access information from one domain and inject it into another domain. The 
update addresses the vulnerability by helping to ensure that cross-domain 
policies are properly enforced in Internet Explorer.

In a web-based attack scenario, an attacker could host a website that is used
to attempt to exploit the vulnerability. In addition, compromised websites and
websites that accept or host user-provided content could contain specially 
crafted content that could exploit the vulnerability. In all cases, however, 
an attacker would have no way to force users to view the attacker-controlled 
content. Instead, an attacker would have to convince users to take action. For
example, an attacker could trick users into clicking a link that takes them to
the attacker's site. An attacker who successfully exploited this vulnerability
could elevate privileges in affected versions of Internet Explorer.

The vulnerability by itself does not allow arbitrary code to be run. However,
the vulnerability could be used in conjunction with another vulnerability (for
example, a remote code execution vulnerability) that could take advantage of 
the elevated privileges when running arbitrary code. For example, an attacker
could exploit another vulnerability to run arbitrary code through Internet 
Explorer, but due to the context in which processes are launched by Internet 
Explorer, the code might be restricted to run at a low integrity level (very 
limited permissions). However, an attacker could, in turn, exploit this 
vulnerability to cause the arbitrary code to run at a medium integrity level 
(permissions of the current user).

The following table contains links to the standard entry for each 
vulnerability in the Common Vulnerabilities and Exposures list: The following
table contains links to the standard entry for each vulnerability in the 
Common Vulnerabilities and Exposures list:

Vulnerability title 					CVE number 	Publicly disclosed 	Exploited

Internet Explorer Elevation of Privilege Vulnerability 	CVE-2016-0005 	Yes 			No

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