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AUSCERT External Security Bulletin Redistribution
ESB-2009.1410.2
Vulnerabilities in the Microsoft .NET Common Language
Runtime Could Allow Remote Code Execution
15 October 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft .NET Framework
Microsoft Silverlight
Publisher: Microsoft
Operating System: Windows 2000
Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-2497 CVE-2009-0091 CVE-2009-0090
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms09-061.mspx
Revision History: October 15 2009: Added additional vulnerability details and CVE references
October 14 2009: Initial Release
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Microsoft Security Bulletin MS09-061 - Critical
Vulnerabilities in the Microsoft .NET Common Language Runtime Could Allow
Remote Code Execution (974378)
Version: 1.0
General Information
Executive Summary
This security update resolves three privately reported vulnerabilities in
Microsoft .NET Framework and Microsoft Silverlight. The vulnerabilities could
allow remote code execution on a client system if a user views a specially
crafted Web page using a Web browser that can run XAML Browser Applications
(XBAPs) or Silverlight applications, or if an attacker succeeds in persuading
a user to run a specially crafted Microsoft .NET application. 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. The
vulnerabilities could also allow remote code execution on a server system
running IIS, if that server allows processing ASP.NET pages and an attacker
succeeds in uploading a specially crafted ASP.NET page to that server and
executing it, as could be the case in a Web hosting scenario. Microsoft .NET
applications, Silverlight applications, XBAPs and ASP.NET pages that are not
malicious are not at risk of being compromised because of this vulnerability.
This security update is rated Critical for all affected editions of the
Microsoft .NET Framework on Microsoft Windows 2000, Windows XP, Windows
Vista, and Windows 7; Microsoft Silverlight 2 when installed on Mac; and
Microsoft Silverlight 2 when installed on all releases of Microsoft Windows
clients.
This security update is rated Important for all affected editions of the
Microsoft .NET Framework on Windows Server 2003, Windows Server 2008, and
Windows Server 2008 R2.
This security update is rated Moderate for Microsoft Silverlight 2 when
installed on all releases of Microsoft Windows servers.
The security update addresses the vulnerabilities by modifying the way in
which the Microsoft .NET verifies and enforces the rules of Microsoft .NET
verifiable code and by modifying the way in which the Microsoft .NET Common
Language Runtime (CLR) handles interfaces.
Recommendation. The majority of customers have automatic updating enabled
and will not need to take any action because this security update will be
downloaded and installed automatically. Customers who have not enabled
automatic updating need to check for updates and install this update
manually. For information about specific configuration options in automatic
updating, see Microsoft Knowledge Base Article 294871.
For administrators and enterprise installations, or end users who want to
install this security update manually, Microsoft recommends that customers
apply the update immediately using update management software, or by
checking for updates using the Microsoft Update service.
See also the section, Detection and Deployment Tools and Guidance, later in
this bulletin.
Known Issues. None
Affected Software:
Microsoft Windows 2000 Service Pack 4: Microsoft .NET Framework 1.1 Service
Pack 1, Microsoft .NET Framework 2.0 Service Pack 1, Microsoft .NET Framework
2.0 Service Pack 2
Media Center Edition 2005 and Tablet PC Edition 2005: Microsoft .NET Framework
1.0 Service Pack 3
Windows XP Service Pack 2 and Windows XP Service Pack 3: Microsoft .NET
Framework 1.1 Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 1 and
Microsoft .NET Framework 3.5, Microsoft .NET Framework 2.0 Service Pack 2 and
Microsoft .NET Framework 3.5 Service Pack 1
Windows XP Professional x64 Edition Service Pack 2: Microsoft .NET Framework
1.1 Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft
.NET Framework 3.5, Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft
.NET Framework 3.5 Service Pack 1
Windows Server 2003 Service Pack 2: Microsoft .NET Framework 1.1 Service
Pack 1, Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET
Framework 3.5, Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET
Framework 3.5 Service Pack 1
Windows Server 2003 x64 Edition Service Pack 2: Microsoft .NET Framework 1.1
Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft
.NET Framework 3.5, Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft
.NET Framework 3.5 Service Pack 1
Windows Server 2003 with SP2 for Itanium-based Systems: Microsoft .NET
Framework 1.1 Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 1 and
Microsoft .NET Framework 3.5, Microsoft .NET Framework 2.0 Service Pack 2 and
Microsoft .NET Framework 3.5 Service Pack 1
Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service
Pack 2: Microsoft .NET Framework 1.1 Service Pack 1
Windows Vista: Microsoft .NET Framework 2.0, Microsoft .NET Framework 2.0
Service Pack 1 and Microsoft .NET Framework 3.5, Microsoft .NET Framework 2.0
Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1
Windows Vista Service Pack 1: Microsoft .NET Framework 2.0 Service Pack 1,
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5
Service Pack 1
Windows Vista Service Pack 2: Microsoft .NET Framework 2.0 Service Pack 2
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and
Windows Vista x64 Edition Service Pack 2: Microsoft .NET Framework 1.1
Service Pack 1
Windows Vista x64 Edition: Microsoft .NET Framework 2.0, Microsoft .NET
Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5, Microsoft
.NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service
Pack 1
Windows Vista x64 Edition Service Pack 1: Microsoft .NET Framework 2.0
Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft
.NET Framework 3.5 Service Pack 1
Windows Vista Service x64 Edition Service Pack 2: Microsoft .NET Framework
2.0 Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
Systems Service Pack 2 (Windows Server 2008 Server Core installation not
affected): Microsoft .NET Framework 1.1 Service Pack 1
Windows Server 2008 for 32-bit Systems (Windows Server 2008 Server Core
installation not affected): Microsoft .NET Framework 2.0 Service Pack 1
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5
Service Pack 1
Windows Server 2008 for 32-bit Systems Service Pack 2 (Windows Server 2008
Server Core installation not affected): Microsoft .NET Framework 2.0 Service
Pack 2
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2 (Windows Server 2008 Server Core
installation not affected): Microsoft .NET Framework 1.1 Service Pack 1
Windows Server 2008 for x64-based Systems (Windows Server 2008 Server Core
installation not affected): Microsoft .NET Framework 2.0 Service Pack 1,
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5
Service Pack 1
Windows Server 2008 for x64-based Systems Service Pack 2 (Windows Server 2008
Server Core installation not affected): Microsoft .NET Framework 2.0 Service
Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2: Microsoft .NET Framework 1.1 Service
Pack 1
Windows Server 2008 for Itanium-based Systems: Microsoft .NET Framework 2.0
Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft
.NET Framework 3.5 Service Pack 1
Windows Server 2008 for Itanium-based Systems Service Pack 2: Microsoft
.NET Framework 2.0 Service Pack 2
Windows 7 for 32-bit Systems: Microsoft .NET Framework 1.1 Service Pack 1
Windows 7 for x64-based Systems: Microsoft .NET Framework 1.1 Service Pack 1
Windows Server 2008 R2 for x64-based Systems (Windows Server 2008 R2 Server
Core installation not affected): Microsoft .NET Framework 1.1 Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems: Microsoft .NET Framework
1.1 Service Pack 1
Microsoft Silverlight 2 when installed on Mac
Microsoft Silverlight 2 when installed on all releases of Microsoft Windows
clients
Microsoft Silverlight 2 when installed on all releases of Microsoft Windows
servers (Windows Server 2008 Server Core installation and Windows Server
2008 R2 Server Core installation not affected)
Vulnerability Information
Microsoft .NET Framework Pointer Verification Vulnerability - CVE-2009-0090
A remote code execution vulnerability exists in the Microsoft .NET Framework
that could allow a malicious Microsoft .NET application to obtain a managed
pointer to stack memory that is no longer used. The malicious Microsoft .NET
application could then use this pointer to modify legitimate values placed at
that stack location later, leading to arbitrary unmanaged code execution.
Microsoft .NET applications that are not malicious are not at risk for being
compromised because of this vulnerability.
Microsoft .NET Framework Type Verification Vulnerability - CVE-2009-0091
A remote code execution vulnerability exists in the Microsoft .NET Framework
that could allow a malicious Microsoft .NET application to bypass a type
equality check. The malicious Microsoft .NET application could exploit this
vulnerability by casting an object of one type into another type, leading to
arbitrary unmanaged code execution. Microsoft .NET applications that are not
malicious are not at risk for being compromised because of this
vulnerability.
Microsoft Silverlight and Microsoft .NET Framework CLR Vulnerability -
CVE-2009-2497
A remote code execution vulnerability exists in the Microsoft .NET Framework
that can allow a malicious Microsoft .NET application or a malicious
Silverlight application to modify memory of the attacker's choice, leading
to arbitrary unmanaged code execution. Microsoft .NET applications and
Silverlight applications that are not malicious are not at risk for being
compromised because of this vulnerability.
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