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AUSCERT External Security Bulletin Redistribution
ESB-2016.1490
MS16-063: Cumulative Security Update for Internet Explorer (3163649)
15 June 2016
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AusCERT Security Bulletin Summary
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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
Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3213 CVE-2016-3212 CVE-2016-3211
CVE-2016-0199 CVE-2016-020
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-063
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MS16-063 - Cumulative Security Update for Internet Explorer (3163649)
Executive Summary
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 the 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.
This security update is rated Critical for Internet Explorer 9 (IE 9), and
Internet Explorer 11 (IE 11) on affected Windows clients, and Moderate for
Internet Explorer 9 (IE 9), Internet Explorer 10 (IE 10), and Internet
Explorer 11 (IE 11) on affected Windows servers.
Affected Software
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Vulnerability Information
Microsoft Internet Explorer Memory Corruption Vulnerabilities
Remote code execution vulnerabilities exist when Internet Explorer improperly
accesses objects in memory. The vulnerabilities could corrupt memory in such a
way that an attacker could execute arbitrary code in the context of the
current user. An attacker who successfully exploited the vulnerabilities could
gain the same user rights as the current user. If the current user is logged
on with administrative user rights, the 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.
An attacker could host a specially crafted website that is designed to exploit
the vulnerabilities through Internet Explorer, and then convince a user to
view the website. The attacker could also take advantage of compromised
websites, or websites that accept or host user-provided content or
advertisements, by adding specially crafted content that could exploit the
vulnerabilities. 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, typically by an enticement in an email or
Instant Messenger message, or by getting them to open an attachment sent
through email. The update addresses the vulnerabilities by modifying how
Internet Explorer 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
Internet Explorer Memory Corruption Vulnerability CVE-2016-0199 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-020 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-3211 No No
Internet Explorer XSS Filter Vulnerability - CVE-2016-3212
A remote code execution vulnerability exists when the Internet Explorer XSS
Filter does not properly validate JavaScript under specific conditions. An
attacker who exploited the vulnerability could run arbitrary code with
medium-integrity level privileges (the permissions of the current user).
In a web-based attack scenario, an attacker could host a website in an attempt
to exploit this vulnerability. In addition, compromised websites and websites
that accept or host user-provided content could contain specially crafted
content that could exploit the vulnerability.
However, in all cases 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 the user to the attacker's site. The update addresses the
vulnerability by fixing how the Internet Explorer XSS Filter validates
JavaScript.
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 XSS Filter Vulnerability CVE-2016-3212 No No
WPAD Elevation of Privilege Vulnerability - CVE-2016-3213
An elevation of privilege vulnerability exists in Microsoft Windows when the
Web Proxy Auto Discovery (WPAD) protocol falls back to a vulnerable proxy
discovery process. An attacker who successfully exploited this vulnerability
could bypass security and gain elevated privileges on a targeted system.
To exploit the vulnerability, an attacker could respond to NetBIOS name
requests for WPAD. The update addresses the vulnerability by correcting how
Windows handles proxy discovery.
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
WPAD Elevation of Privilege Vulnerability CVE-2016-3213 No No
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