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AUSCERT External Security Bulletin Redistribution
ESB-2016.1493
Microsoft Security Bulletin MS16-070: Security Update for
Microsoft Office (3163610)
15 June 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
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3235 CVE-2016-3234 CVE-2016-3233
CVE-2016-0025
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-070
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Microsoft Security Bulletin MS16-070: Security Update for Microsoft Office
(3163610)
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 Compatibility Pack Service Pack 3
Microsoft Word Viewer
Microsoft Visio Viewer 2007 Service Pack 3
Microsoft Visio Viewer 2010
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 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.
Note that where the severity is indicated as Critical in the Affected Software
and Vulnerability Severity Ratings table, the Preview Pane is an attack vector
for CVE-2016-0025. The security update addresses the vulnerability by
correcting how Office 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
Microsoft Office Memory Corruption Vulnerability CVE-2016-0025 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3233 No No
Microsoft Office Information Disclosure Vulnerability - CVE-2016-3234
An information disclosure vulnerability exists when Microsoft Office
improperly discloses the contents of its memory. An attacker who exploited the
vulnerability could use the information to compromise the users computer or
data. To exploit the vulnerability, an attacker could craft a special document
file, and then convince the victim to open it. An attacker must know the
memory address location where the object was created. The update addresses the
vulnerability by changing the way certain functions handle 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
Microsoft Office Information Disclosure Vulnerability CVE-2016-3234 No No
Microsoft Office OLE DLL Side Loading Vulnerability - CVE-2016-3235
A remote code execution vulnerability exists when Windows improperly validates
input before loading libraries. 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. 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 vulnerability, an attacker would need access to the local
system and the ability to execute a specially crafted application on the
system. The security update addresses the vulnerability by correcting how
Windows validates input before loading libraries.
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
Microsoft Office OLE DLL Side Loading Vulnerability CVE-2016-3235 No No
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