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AUSCERT External Security Bulletin Redistribution
ESB-2016.2141
Microsoft Security Bulletin MS16-107: Security Update for
Microsoft Office (3185852)
14 September 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office
Operating System: Windows
OS X
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Access Privileged Data -- Remote with User Interaction
Access Confidential Data -- Existing Account
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3381 CVE-2016-3366 CVE-2016-3365
CVE-2016-3364 CVE-2016-3363 CVE-2016-3362
CVE-2016-3361 CVE-2016-3360 CVE-2016-3359
CVE-2016-3358 CVE-2016-3357 CVE-2016-0141
CVE-2016-0137
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-107
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Microsoft Security Bulletin MS16-107: Security Update for Microsoft Office
(3185852)
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 Office Compatibility Pack Service Pack 3
Microsoft Excel Viewer
Microsoft PowerPoint Viewer
Microsoft Word Viewer
Vulnerability Information
Microsoft APP-V ASLR Bypass - CVE-2016-0137
An information disclosure vulnerability exists in the way that the
Click-to-Run (C2R) components handle objects in memory, which could lead to an
Address Space Layout Randomization (ASLR) bypass.
An attacker who successfully exploited the information disclosure
vulnerability could use the obtained information to bypass the ASLR security
mechanism in Windows, which helps protect users from a broad class of
vulnerabilities. The ASLR bypass by itself does not allow arbitrary code
execution; however, an attacker could use the ASLR bypass in conjunction with
another vulnerability, such as a remote code execution vulnerability, that
could leverage the ASLR bypass to run arbitrary code.
To exploit the ASLR bypass, an attacker would have to log on to an affected
system and run a specially crafted application. Workstations are primarily
vulnerable to the potential ASLR bypass.
The security update addresses the ASLR bypass by correcting how C2R components
handle memory addresses.
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 APP-V ASLR Bypass CVE-2016-0137 No No
Microsoft Information Disclosure Vulnerability - CVE-2016-0141
An information disclosure vulnerability exists when Visual Basic macros in
Office improperly exports a users private key from the certificate store while
saving a document. An attacker who successfully exploited the vulnerability
could potentially gain access to the users private key.
The attacker would have to use another vulnerability, or employ a social
engineering technique, to obtain the saved document from the user.
The security update addresses the vulnerability by correcting how Microsoft
Office saves documents.
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 Information Disclosure Vulnerability CVE-2016-0141 No No
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-2016-3357.
The security update addresses the vulnerabilities by correcting how Microsoft
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-2016-3357 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3358 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3359 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3360 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3361 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3362 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3363 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3364 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3365 No No
Microsoft Office Memory Corruption Vulnerability CVE-2016-3381 No No
Microsoft Office Spoofing Vulnerability - CVE-2016-3366
A spoofing vulnerability exists when Microsoft Outlook does not strictly
adhere to RFC2046, and improperly identifies the end of a MIME attachment. An
improper MIME attachment ending may cause antivirus or antispam scanning to
not work as intended.
To exploit the vulnerability, an attacker could send a specially crafted email
attachment to a user in an attempt to launch a social engineering attack, such
as phishing.
The security update addresses the vulnerability by correcting how Outlook
determines the end of MIME messages.
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 Spoofing Vulnerability CVE-2016-3366 No No
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