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AUSCERT External Security Bulletin Redistribution
ESB-2015.2065
Microsoft Security Bulletin MS15-081 - Vulnerabilities in Microsoft Office
Could Allow Remote Code Execution - Critical (3080790)
12 August 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office
Microsoft Office Web Apps
Microsoft SharePoint Server Software
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-2015-2477 CVE-2015-2470 CVE-2015-2469
CVE-2015-2468 CVE-2015-2467 CVE-2015-2466
CVE-2015-2423 CVE-2015-1642
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-081
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Microsoft Security Bulletin MS15-081 - Vulnerabilities in Microsoft Office
Could Allow Remote Code Execution - Critical (3080790)
Bulletin Number: MS15-081
Bulletin Title: Vulnerabilities in Microsoft Office Could Allow Remote Code
Execution
Severity: Critical
KB Article: 3080790
Version: 1.0
Published Date: August 11, 2015
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.
For more information, see the Affected Software.
Affected Software
Microsoft Office 2007
Microsoft Office 2007 Service Pack 3
Microsoft Excel 2007 Service Pack 3
Microsoft PowerPoint 2007 Service Pack 3
Microsoft Visio 2007 Service Pack 3
Microsoft Word 2007 Service Pack 3
Microsoft Office 2010
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
Microsoft Excel 2010 Service Pack 2 (32-bit editions)
Microsoft Excel 2010 Service Pack 2 (64-bit editions)
Microsoft PowerPoint 2010 Service Pack 2 (32-bit editions)
Microsoft PowerPoint 2010 Service Pack 2 (64-bit editions)
Microsoft Visio 2010 Service Pack 2 (32-bit editions)
Microsoft Visio 2010 Service Pack 2 (64-bit editions)
Microsoft Word 2010 Service Pack 2 (32-bit editions)
Microsoft Word 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2013
Microsoft Office 2013 Service Pack 1 (32-bit editions)
Microsoft Office 2013 Service Pack 1 (64-bit editions)
Microsoft Excel 2013 Service Pack 1 (32-bit editions)
Microsoft Excel 2013 Service Pack 1 (64-bit editions)
Microsoft PowerPoint 2013 Service Pack 1 (32-bit editions)
Microsoft PowerPoint 2013 Service Pack 1 (64-bit editions)
Microsoft Visio 2013 Service Pack 1 (32-bit editions)
Microsoft Visio 2013 Service Pack 1 (64-bit editions)
Microsoft Word 2013 Service Pack 1 (32-bit editions)
Microsoft Word 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2013 RT
Microsoft Office 2013 RT Service Pack 1 [1]
Microsoft Office 2013 RT Service Pack 1 [1]
Microsoft Excel 2013 RT Service Pack 1 [1]
Microsoft PowerPoint 2013 RT Service Pack 1 [1]
Microsoft Visio 2013 RT Service Pack 1 (64-bit editions) [1]
Microsoft Word 2013 RT Service Pack 1 [1]
Microsoft Office for Mac 2011
Microsoft Office for Mac 2016
Other Office Software
Microsoft Office Compatibility Pack Service Pack 3
Microsoft Word Viewer
Microsoft Word Viewer
[1]This update is available via Windows Update.
Microsoft Office Services and Web Apps
Microsoft SharePoint Server 2010
Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2
Microsoft SharePoint Server 2013
Word Automation Services on Microsoft SharePoint Server 2013 Service Pack 1
Microsoft Office Web Apps 2010
Microsoft Word Web Apps 2010 Service Pack 2
Microsoft Office Web Apps 2013
Microsoft Office Web Apps Server 2013 Service Pack 1
Vulnerability Information
Multiple Microsoft Office Memory Corruption Vulnerabilities
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 vulnerability could use a specially crafted
file to perform actions in the security context of the current user. The file
could then, for example, take actions on behalf of the logged-on user with the
same permissions as the current user. Exploitation of this 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 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 Microsoft
Office handles files 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-2015-1642 No Yes
Microsoft Office Memory Corruption Vulnerability CVE-2015-2467 No No
Microsoft Office Memory Corruption Vulnerability CVE-2015-2468 No No
Microsoft Office Memory Corruption Vulnerability CVE-2015-2469 No No
Microsoft Office Memory Corruption Vulnerability CVE-2015-2477 No No
Unsafe Command Line Parameter Passing Vulnerability - CVE-2015-2423
An information disclosure vulnerability exists in Microsoft Windows, Internet
Explorer, and Microsoft Office when files at a medium integrity level become
accessible to Internet Explorer running in Enhanced Protection Mode (EPM).
To exploit this vulnerability, an attacker would first need to leverage
another vulnerability and execute code in Internet Explorer with EPM, and then
execute Excel, Notepad, PowerPoint, Visio, or Word using an unsafe command
line parameter. The update addresses the vulnerability by improving how
Notepad and Microsoft Office programs are executed from Internet Explorer.
Important To be protected from this vulnerability, customers must apply the
updates provided in this bulletin, as well as the update for Internet Explorer
provided in MS15-079. Likewise, customers running an affected version of
Microsoft Windows must also install the applicable updates provided in
MS15-088.
This vulnerability has been publicly disclosed. It has been assigned Common
Vulnerability and Exposure number CVE-2015-2423. When this bulletin was
originally released, Microsoft had not received any information to indicate
that this issue had been publicly used to attack customers.
Microsoft Office Remote Code Execution Vulnerability - CVE-2015-2466
A remote code execution vulnerability exists in Microsoft Office software when
the Office software fails to properly validate templates. An attacker who
successfully exploited this vulnerability could run arbitrary code in the
context of the current user. Exploitation of this vulnerability requires that
a user open a specially crafted template file with an affected version of
Microsoft Office software.
An attacker who successfully exploited this vulnerability could gain the same
user rights as the current user. If the current user is logged on with
administrative user rights, an attacker could take complete 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.
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 file share
(or leverage a compromised website that accepts or hosts user-provided
content) that contains a specially crafted file that is designed to exploit
the vulnerability. An attacker would have no way to force users to visit the
website or file share. 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.
Alternatively, an attacker could launch a Man-in-the-middle attack (intercept
the traffic between source and destination) and modify the template contents
to include malicious code.
The security update addresses the vulnerability by correcting how Office
validates office templates prior to use.
Microsoft received information about the vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft
had not received any information to indicate that this vulnerability had been
publicly used to attack customers.
Microsoft Office Integer Underflow Vulnerability - CVE-2015-2470
A remote code execution vulnerability exists when Office decreases an integer
value beyond its intended minimum value. Exploitation of this vulnerability
requires that a user open a specially crafted Office file with an affected
version of Microsoft Office software.
An attacker who successfully exploited this vulnerability could gain the same
user rights as the current user. If the current user is logged on with
administrative user rights, an attacker could take complete 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.
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 vulnerability. 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 vulnerability by correcting how Office
handles integer bounds checking.
Microsoft received information about the vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft
had not received any information to indicate that this vulnerability had been
publicly used to attack customers.
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