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AUSCERT External Security Bulletin Redistribution
ESB-2010.1132
Vulnerabilities in the OpenType Font (OTF) Driver Could
Allow Remote Code Execution (2296199)
15 December 2010
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AusCERT Security Bulletin Summary
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Product: Windows Open Type Font (OTF) driver
Publisher: Microsoft
Operating System: Windows XP
Windows Vista
Windows 7
Windows Server 2003
Windows Server 2008
Impact/Access: Administrator Compromise -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2010-3959 CVE-2010-3957 CVE-2010-3956
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS10-091.mspx
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Microsoft Security Bulletin MS10-091 - Critical
Vulnerabilities in the OpenType Font (OTF) Driver Could Allow Remote Code
Execution (2296199)
Version: 1.0
General Information
Executive Summary
This security update resolves several privately reported vulnerabilities in
the Windows Open Type Font (OTF) driver that could allow remote code
execution. An attacker could host a specially crafted OpenType font on a
network share. The affected control path is then triggered when the user
navigates to the share in Windows Explorer, allowing the specially crafted
font to take complete control over an affected system. An attacker could
then install programs; view, change, or delete data; or create new accounts
with full user rights.
This security update is rated Critical for all supported editions of Windows
Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2. This
security update is also rated Important for all supported editions of
Windows XP and Windows Server 2003. For more information, see the
subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by correcting the way that
the OpenType Font (OTF) driver indexes arrays when parsing OpenType fonts,
resets pointers when freeing memory, and parses the CMAP table when
rendering OpenType fonts. For more information about the vulnerabilities,
see the Frequently Asked Questions (FAQ) subsection for the specific
vulnerability entry under the next section, Vulnerability Information.
Affected Software
Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 1
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems Service Pack 2*
Windows Server 2008 for x64-based Systems
Windows Server 2008 for x64-based Systems Service Pack 2*
Windows Server 2008 for Itanium-based Systems
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems*
Windows Server 2008 R2 for Itanium-based Systems
Vulnerability Information
OpenType Font Index Vulnerability - CVE-2010-3956
A remote code execution vulnerability exists in the way that the OpenType
Font (OTF) driver improperly parses specially crafted OpenType fonts. An
attacker who successfully exploited this vulnerability could run arbitrary
code in kernel mode. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights.
OpenType Font Double Free Vulnerability - CVE-2010-3957
A remote code execution vulnerability exists in the way that the OpenType
Font (OTF) driver improperly parses specially crafted OpenType fonts. An
attacker who successfully exploited this vulnerability could run arbitrary
code in kernel mode. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights.
OpenType CMAP Table Vulnerability - CVE-2010-3959
A remote code execution vulnerability exists in the way that the OpenType
Font (OTF) driver improperly parses specially crafted OpenType fonts. An
attacker who successfully exploited this vulnerability could run arbitrary
code in kernel mode. An attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
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