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AUSCERT External Security Bulletin Redistribution
ESB-2009.1399.2
Vulnerabilities in SMBv2 Could Allow Remote Code Execution
15 October 2009
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AusCERT Security Bulletin Summary
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Product: SMBv2
Publisher: Microsoft
Operating System: Windows Vista
Windows Server 2008
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-2526
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms09-050.mspx
Revision History: October 15 2009: Additional vulnerability details & CVE references added
October 14 2009: Initial Release
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Microsoft Security Bulletin MS09-050 - Critical
Vulnerabilities in SMBv2 Could Allow Remote Code Execution (975517)
Published: October 13, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves one publicly disclosed and two privately
reported vulnerabilities in Server Message Block Version 2 (SMBv2). The most
severe of the vulnerabilities could allow remote code execution if an
attacker sent a specially crafted SMB packet to a computer running the Server
service. Firewall best practices and standard default firewall configurations
can help protect networks from attacks that originate from outside the
enterprise perimeter. Best practices recommend that systems that are
connected to the Internet have a minimal number of ports exposed.
This security update is rated Critical for supported editions of Windows
Vista and Windows Server 2008. For more information, see the subsection,
Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by correctly validating the
fields inside the SMBv2 packets, correcting the way that SMB handles the
command value in SMB packets, and correcting the way that SMB parses
specially crafted SMB packets. For more information about the
vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the
specific vulnerability entry under the next section, Vulnerability
Information.
This security update also addresses the vulnerability first described in
Microsoft Security Advisory 975497.
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
Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service
Pack 2
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and
Windows Vista x64 Edition 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
affected)
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2 (Windows Server 2008 Server Core
installation affected)
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2
Vulnerability Information
SMBv2 Infinite Loop Vulnerability - CVE-2009-2526
A denial of service vulnerability exists in the way that Microsoft Server
Message Block (SMB) Protocol software handles specially crafted SMB version 2
(SMBv2) packets. An attempt to exploit the vulnerability would not require
authentication, allowing an attacker to exploit the vulnerability by sending a
specially crafted network message to a computer running the Server service. An
attacker who successfully exploited this vulnerability could cause the computer
to stop responding until restarted.
SMBv2 Command Value Vulnerability - CVE-2009-2532
An unauthenticated remote code execution vulnerability exists in the way that
Microsoft Server Message Block (SMB) Protocol software handles specially
crafted SMB packets. An attempt to exploit the vulnerability would not require
authentication, allowing an attacker to exploit the vulnerability by sending a
specially crafted network message to a computer running the Server service. An
attacker who successfully exploited this vulnerability could take complete
control of the system.
SMBv2 Negotiation Vulnerability - CVE-2009-3103
An unauthenticated remote code execution vulnerability exists in the way that
Microsoft Server Message Block (SMB) Protocol software handles specially
crafted SMB packets. An attempt to exploit the vulnerability would not require
authentication, allowing an attacker to exploit the vulnerability by sending a
specially crafted SMB packet to a computer running the Server service. An
attacker who successfully exploited this vulnerability could take complete
control of the system.
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The University of Queensland
Brisbane
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