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AUSCERT External Security Bulletin Redistribution
ESB-2011.0515
Microsoft Security Bulletin MS11-036 - Vulnerabilities in
Microsoft PowerPoint Could Allow Remote Code Execution
11 May 2011
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft PowerPoint 2002 Service Pack 3
Microsoft PowerPoint 2003 Service Pack 3
Microsoft PowerPoint 2007 Service Pack 2
Microsoft Office 2004 for Mac
Microsoft Office 2008 for Mac
Open XML File Format Converter for Mac
Microsoft Office Compatibility Pack
Publisher: Microsoft
Operating System: Windows
Mac OS X
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2011-1270 CVE-2011-1269
Reference: ESB-2011.0513
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS11-036.mspx
Comment: Workarounds are available to mitigate this vulnerability
- see the original bulletin for more information.
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Microsoft Security Bulletin MS11-036 - Important
Vulnerabilities in Microsoft PowerPoint Could Allow Remote Code Execution (2545814)
Published: May 10, 2011
Version: 1.0
General Information
Executive Summary
This security update resolves two privately reported vulnerabilities in
Microsoft PowerPoint. The vulnerabilities could allow remote code execution
if a user opens a specially crafted PowerPoint file. An attacker who
successfully exploited either of these vulnerabilities could gain the same
user rights as the logged-on user. 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. Installing and configuring Office
File Validation (OFV) to prevent the opening of suspicious files blocks
the attack vectors for exploiting the vulnerabilities described in
CVE-2011-1269 and CVE-2011-1270. See the section, Frequently Asked
Questions (FAQ) Related to This Security Update, for more information about
how the Office File Validation feature can be configured to block the
attack vectors.
This security update is rated Important for all supported editions of
Microsoft PowerPoint 2002, Microsoft PowerPoint 2003, Microsoft PowerPoint
2007, Microsoft Office 2004 for Mac, and Microsoft Office 2008 for Mac.
The security update is also rated Important for all supported versions of
Open XML File Format Converter for Mac and Microsoft Office Compatibility
Pack. For more information, see the subsection, Affected and Non-Affected
Software, in this section. The update addresses the vulnerabilities by
correcting the way that PowerPoint handles memory when parsing specially
crafted PowerPoint files.
Affected Software
Microsoft PowerPoint 2002 Service Pack 3
Microsoft PowerPoint 2003 Service Pack 3
Microsoft PowerPoint 2007 Service Pack 2
Microsoft Office 2004 for Mac
Microsoft Office 2008 for Mac
Open XML File Format Converter for Mac
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007
File Formats Service Pack 2
Presentation Memory Corruption RCE Vulnerability - CVE-2011-1269
A remote code execution vulnerability exists in the way that Microsoft
PowerPoint handles specially crafted PowerPoint files. An attacker who
successfully exploited this vulnerability could take complete control of
an affected system. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights. To view
this vulnerability as a standard entry in the Common Vulnerabilities and
Exposures list, see CVE-2011-1269.
Mitigating Factors for Presentation Memory Corruption RCE Vulnerability -
CVE-2011-1269
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to convince users to visit the Web site,
typically by getting them to click a link in an e-mail message or Instant
Messenger message that takes users to the attacker's Web site, and then
convince them to open the specially crafted PowerPoint file.
The vulnerability cannot be exploited automatically through e-mail. For
an attack to be successful, a user must open an attachment that is sent
in an e-mail message.
An attacker who successfully exploited this vulnerability could gain the
same user rights as the logged-on user. 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.
Presentation Buffer Overrun RCE Vulnerability - CVE-2011-1270
A remote code execution vulnerability exists in the way that Microsoft
PowerPoint handles specially crafted PowerPoint files. An attacker who
successfully exploited this vulnerability could take complete control of
an affected system. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights. To view
this vulnerability as a standard entry in the Common Vulnerabilities and
Exposures list, see CVE-2011-1270.
Mitigating Factors for Presentation Buffer Overrun RCE Vulnerability -
CVE-2011-1270 Mitigation refers to a setting, common configuration, or
general best-practice, existing in a default state, that could reduce the
severity of exploitation of a vulnerability. The following mitigating
factors may be helpful in your situation:
In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to convince users to visit the Web site,
typically by getting them to click a link in an e-mail message or Instant
Messenger message that takes users to the attacker's Web site, and then
convince them to open the specially crafted PowerPoint file.
The vulnerability cannot be exploited automatically through e-mail. For
an attack to be successful, a user must open an attachment that is sent
in an e-mail message.
An attacker who successfully exploited this vulnerability could gain the
same user rights as the logged-on user. 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.
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