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AUSCERT External Security Bulletin Redistribution
ESB-2016.0618
Microsoft Security Bulletin MS16-029: Security Update for Microsoft Office
to Address Remote Code Execution - Important (3141806)
8 March 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office
Microsoft SharePoint Server
Publisher: Microsoft
Operating System: Windows
OS X
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0134 CVE-2016-0057 CVE-2016-0021
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-029
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Microsoft Security Bulletin MS16-029: Security Update for Microsoft Office to
Address Remote Code Execution - Important (3141806)
Bulletin Number: MS16-029
Bulletin Title: Security Update for Microsoft Office to Address Remote Code
Execution
Severity: Important
KB Article: 3141806
Version: 1.0
Published Date: March 8, 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 2007 Service Pack 3 (2956110)
Microsoft InfoPath 2007 Service Pack 3 (3114426)
Microsoft Word 2007 Service Pack 3 (3114901)
Microsoft Office 2010
Microsoft Office 2010 Service Pack 2 (32-bit editions) (2956063)
Microsoft Office 2010 Service Pack 2 (32-bit editions) (3114873)
Microsoft Office 2010 Service Pack 2 (64-bit editions) (3114873)
Microsoft InfoPath 2010 Service Pack 2 (32-bit editions) (3114414)
Microsoft InfoPath 2010 Service Pack 2 (64-bit editions) (3114414)
Microsoft Word 2010 Service Pack 2 (32-bit editions) (3114878)
Microsoft Word 2010 Service Pack 2 (64-bit editions) (3114878)
Microsoft Office 2013
Microsoft Office 2013 Service Pack 1 (32-bit editions) (3039746)
Microsoft InfoPath 2013 Service Pack 1 (32-bit editions) (3114833)
Microsoft InfoPath 2013 Service Pack 1 (64-bit editions) (3114833)
Microsoft Word 2013 Service Pack 1 (32-bit editions) (3114824)
Microsoft Word 2013 Service Pack 1 (64-bit editions) (3114824)
Microsoft Office 2013 RT
Microsoft Word 2013 RT Service Pack 1 (3114824)[1]
Microsoft Office 2016
Microsoft Office 2016 (32-bit edition) (3114690)
Microsoft Word 2016 (32-bit edition) (3114855)
Microsoft Word 2016 (64-bit edition) (3114855)
Microsoft Office for Mac 2011
Microsoft Word for Mac 2011 (3138328)[2]
Microsoft Office 2016 for Mac Microsoft Word 2016 for Mac (3138327)[2]
Other Office Software
Microsoft Office Compatibility Pack Service Pack 3 (3114900)
Microsoft Word Viewer(3114812)
[1]This update is available via Windows Update.
[2]The 3138328 update for Microsoft Office for Mac 2011 and the 3138327 update
for Microsoft Office 2016 for Mac are not yet available. The updates will be
released as soon as they are available and users will be notified via a
bulletin revision.
Microsoft Office Services and Web Apps
Microsoft SharePoint Server 2010
Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2 (3114866)
Microsoft SharePoint Server 2013
Word Automation Services on Microsoft SharePoint Server 2013 Service Pack 1 (3114814)
Microsoft Office Web Apps 2010
Microsoft Office Web Apps 2010 Service Pack 2 (3114880)
Microsoft Office Web Apps 2013
Microsoft Web Apps Server 2013 Service Pack 1 (3114821)
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 the 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.
Exploitation of the vulnerabilities requires that a user open a specially
crafted file with an affected version of Microsft Office software. Note that
the Preview Pane is not an attack vector for these vulnerabilities. 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-2016-0021 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-0134 No No
Microsoft Office Security Feature Bypass Vulnerability - CVE-2016-0057
A security feature bypass vulnerability exists in Microsoft Office software
due to an invalidly signed binary. An attacker who successfully exploited the
vulnerability could use a similarly configured binary to host malicious code.
A defender would then not be able to rely on a valid binary signature to
differentiate between a known good and a malicious binary.
To successfully exploit this vulnerability, an attacker would have to have
write access to the target location that contains the invalidly signed binary.
The attacker could then overwrite the original file with their own malicious
file and wait for an application, or user, to trigger the malicious binary.
The security update addresses the vulnerability by providing a validly signed
binary.
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 Security Feature Bypass Vulnerability CVE-2016-0057
No No
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