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AUSCERT External Security Bulletin Redistribution
ESB-2016.0076
Microsoft Security Bulletin MS16-004 Security Update for Microsoft Office
to Address Remote Code Execution - Critical
13 January 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office
Publisher: Microsoft
Operating System: Windows
OS X
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0035 CVE-2016-0012 CVE-2016-0011
CVE-2016-0010 CVE-2015-6117
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-004
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Microsoft Security Bulletin MS16-004 Security Update for Microsoft Office to
Address Remote Code Execution - Critical (3124585)
Document Metadata
Bulletin Number: MS16-004
Bulletin Title: Security Update for Microsoft Office to Address Remote Code
Execution
Severity: Critical
KB Article: 3124585
Version: 1.0
Published Date: January 12, 2016
Executive Summary
This security update resolves vulnerabilities in Microsoft Office. The most
severe of the vulnerabilities could allow remote code execution if a user
opens a specially crafted Microsoft Office file. An attacker who successfully
exploited the vulnerabilities could run arbitrary code in the context of 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.
Affected Software
Microsoft Office 2007
Microsoft Office 2010
Microsoft Office 2013
Microsoft Office 2013 RT
Microsoft Office 2016
Microsoft Office for Mac 2011
Microsoft Office 2016 for Mac
Microsoft Office Compatibility Pack Service Pack 3
Microsoft Excel Viewer
Microsoft Word Viewer
Microsoft SharePoint Foundation 2013
Microsoft Visual Basic Runtime 6.0
Vulnerability Information
Multiple Microsoft Office Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in Microsoft Office
software when the Office software fails to properly handle objects in memory.
An attacker who successfully exploited these vulnerabilities could run
arbitrary code in the context of the current user. If the current user is
logged on with administrative user rights, an attacker could take control of
the affected system. 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 users who operate with administrative user rights.
To exploit the vulnerabilities, a user must open a specially crafted file with
an affected version of Microsoft Office software. In an email attack scenario
an attacker could exploit the vulnerabilities by sending the specially crafted
file to the user and convincing the user to open the file. In a web-based
attack scenario an attacker could host a website (or leverage a compromised
website that accepts or hosts user-provided content) that contains a specially
crafted file that is designed to exploit the vulnerabilities. An attacker
would have no way to force users to visit the website. Instead, an attacker
would have to convince users to click a link, typically by way of an
enticement in an email or Instant Messenger message, and then convince them to
open the specially crafted file. The security update addresses the
vulnerabilities by correcting how Office handles objects in memory.
The following tables contain links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Office Memory Corruption Vulnerability CVE-2016-0010 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-0035 Yes No
Multiple Microsoft SharePoint Security Feature Bypasses
Multiple security feature bypasses exist in Microsoft SharePoint when Access
Control Policy (ACP) configuration settings are not enforced correctly.
To exploit the bypasses, an attacker could add script to a webpart, on a
SharePoint site, that only a SharePoint site administrator could normally add,
and then use the webpart in a cross-site scripting attack in the context of a
user visiting the SharePoint site. The bypasses could allow the attacker to
read unauthorized content, and perform actions on the SharePoint site as the
user, such as change permissions, delete content, and inject malicious content
into the users browser. The update addresses the bypasses by ensuring that ACP
configuration settings are enforced correctly.
The following tables contain links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft SharePoint Security Feature Bypass CVE-2016-0011 No No
Microsoft SharePoint Security Feature Bypass CVE-2015-6117 Yes No
Microsoft Office ASLR Bypass CVE-2016-0012
A security feature bypass exists when Microsoft Office fails to use the
Address Space Layout Randomization (ASLR) security feature, allowing an
attacker to more reliably predict the memory offsets of specific instructions
in a given call stack. An attacker who successfully exploited it could bypass
the Address Space Layout Randomization (ASLR) security feature, which helps
protect users from a broad class of vulnerabilities. The security feature
bypass by itself does not allow arbitrary code execution. However, an attacker
could use this ASLR bypass in conjunction with another vulnerability, such as
a remote code execution vulnerability, to more reliably run arbitrary code on
a target system.
In a web-browsing scenario, successful exploitation of the ASLR bypass
requires a user to be logged on and running an affected version of Microsoft
Office. The user would then need to browse to a malicious site. Therefore, any
systems where a web browser is used frequently, such as workstations or
terminal servers, are at the most risk from this ASLR bypass. Servers could be
at more risk if administrators allow users to browse and read email on
servers. However, best practices strongly discourage allowing this. The update
addresses the ASLR bypass by helping to ensure that affected versions of
Microsoft Office properly implement the ASLR security feature.
Microsoft received information about this bypass through coordinated bypass
disclosure. At the time this security bulletin was originally issued,
Microsoft was unaware of any attack attempting to exploit this bypass.
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