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AUSCERT External Security Bulletin Redistribution
ESB-2016.2388
Microsoft Security Bulletin MS16-121 - Important Security
Update for Microsoft Office (3194063)
12 October 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
Resolution: Patch/Upgrade
CVE Names: CVE-2016-7193
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-121
Comment: CVE-2016-7193 is being actively exploited in the wild.
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Microsoft Security Bulletin MS16-121 - Important Security Update for Microsoft
Office (3194063)
Published: October 11, 2016
Version: 1.0
Executive Summary
This security update resolves a vulnerability in Microsoft Office. An Office
RTF remote code execution vulnerability exists in Microsoft Office software
when the Office software fails to properly handle RTF files. An attacker who
successfully exploited the vulnerabilities could run arbitrary code in the
context of the current user.
The update addresses the vulnerability by changing the way Microsoft Office
software handles RTF content.
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 Word Viewer
Microsoft SharePoint Server 2010
Microsoft SharePoint Server 2013
Microsoft Office Web Apps 2010
Microsoft Office Web Apps 2013
Office Online Server
Vulnerability Information Microsoft Office Memory Corruption Vulnerability
An Office RTF remote code execution vulnerability exists in Microsoft Office
software when the Office software fails to properly handle RTF files. 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 vulnerability 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 vulnerability 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 update addresses the vulnerability by changing the way Microsoft Office
software handles RTF content.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. Microsoft is aware of limited attacks that use this
vulnerability in conjunction with other vulnerabilities to gain code
execution.
The following table contains the link to the standard entry for the
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Office Memory Corruption Vulnerability CVE-2016-7193 No Yes
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