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AUSCERT External Security Bulletin Redistribution
ESB-2009.1267.2
Vulnerabilities in Windows TCP/IP Could Allow Remote Code Execution
10 September 2009
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AusCERT Security Bulletin Summary
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Product: Windows TCP/IP
Publisher: Microsoft
Operating System: Windows 2000
Windows Server 2003
Windows Vista
Windows Server 2008
Windows XP
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2008-4609 CVE-2009-1925 CVE-2009-1926
Reference: ESB-2009.1263
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS09-048.mspx
Comment: Microsoft has updated this security bulletin to include Windows XP in
the list of affected software. No patch has been issued for Windows
XP for the following reason:
"By default, Windows XP Service Pack 2, Windows XP Service Pack 3,
and Windows XP Professional x64 Edition Service Pack 2 do not have a
listening service configured in the client firewall and are therefore
not affected by this vulnerability. The denial of service attacks
require a sustained flood of specially crafted TCP packets, and the
system will recover once the flood ceases. This makes the severity
rating Low for Windows XP. Additionally, Windows XP Service Pack 2
and later operating systems include a stateful host firewall that
provides protection for computers against incoming traffic from the
Internet or from neighboring network devices on a private network.
Windows XP is not affected by CVE-2009-1925"
Revision History: September 10 2009: Updated to contain information from
Microsoft regarding Windows XP
September 9 2009: Initial Release
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Microsoft Security Bulletin MS09-048 - Critical
Vulnerabilities in Windows TCP/IP Could Allow Remote Code Execution (967723)
Published: September 08, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves several privately reported vulnerabilities in
Transmission Control Protocol/Internet Protocol (TCP/IP) processing. The
vulnerabilities could allow remote code execution if an attacker sent
specially crafted TCP/IP packets over the network to a computer with a
listening service. Firewall best practices and standard default firewall
configurations can help protect networks from attacks that originate 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 all supported editions of Windows
Vista and Windows Server 2008, and Important for all supported editions of
Microsoft Windows 2000 Service Pack 4 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 dropping existing TCP
connections adaptively and limiting the number of new TCP connections until
system resources are restored, and changing the manner in which TCP/IP packets
are processed. For more information about the vulnerabilities, see the
Frequently Asked Questions (FAQ) subsection for the specific vulnerability
entry under the next section, Vulnerability Information.
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. Microsoft Knowledge Base Article 967723 documents the
currently known issues that customers may experience when installing this
security update. The article also documents recommended solutions for these
issues.
Affected Software
Microsoft Windows 2000 Service Pack 4
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, 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 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and
Windows Server 2008 for Itanium-based Systems Service Pack 2
Vulnerability Information
TCP/IP Zero Window Size Vulnerability - CVE-2008-4609
A denial of service vulnerability exists in TCP/IP processing in
Microsoft Windows due to the way that Windows handles an excessive number of
established TCP connections. The effect of this vulnerability can be
amplified by the requirement to process specially crafted packets with a TCP
receive window size set to a very small value or zero. An attacker could
exploit the vulnerability by flooding a system with specially crafted packets
causing the affected system to stop responding to new requests or
automatically restart.
TCP/IP Timestamps Code Execution Vulnerability - CVE-2009-1925
A remote code execution vulnerability exists in the Windows TCP/IP stack due
to the TCP/IP stack not cleaning up state information correctly. This causes
the TCP/IP stack to reference a field as a function pointer when it actually
contains other information. An anonymous attacker could exploit the
vulnerability by sending specially crafted TCP/IP packets to a computer that
has a service listening over the network. 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.
TCP/IP Orphaned Connections Vulnerability - CVE-2009-1926
A denial of service vulnerability exists in TCP/IP processing in Microsoft
Windows due to an error in the processing of specially crafted packets with a
small or zero TCP receive window size. If an application closes a TCP connection
with pending data to be sent and an attacker has set a small or zero TCP receive
window size, the affected server will not be able to completely close the TCP
connection. An attacker could exploit the vulnerability by flooding a system with
specially crafted packets causing the affected system to stop responding to new
requests. The system would remain non-responsive even after the attacker stops
sending malicious packets.
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The University of Queensland
Brisbane
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