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AUSCERT External Security Bulletin Redistribution
ESB-2010.0350
Vulnerability in Windows ISATAP Component Could Allow Spoofing
14 April 2010
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AusCERT Security Bulletin Summary
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Product: Windows ISATAP
Publisher: Microsoft
Operating System: Windows Server 2008
Windows Server 2003
Windows Vista
Windows XP
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2010-0812
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms10-029.mspx
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Microsoft Security Bulletin (978338)
Vulnerability in Windows ISATAP Component Could Allow Spoofing
Published: April 13, 2010
Version: 1.0
General Information
Executive Summary
This security update resolves one privately reported vulnerability in
Microsoft Windows. This security update is rated Moderate for Windows XP,
Windows Server 2003, Windows Vista, and Windows Server 2008. Windows 7 and
Windows Server 2008 R2 are not vulnerable because these operating systems
include the feature deployed by this security update.
This vulnerability could allow an attacker to spoof an IPv4 address so that it
may bypass filtering devices that rely on the source IPv4 address. The
security update addresses the vulnerability by changing the manner in which
the Windows TCP/IP stack checks the source IPv6 address in a tunneled ISATAP
packet.
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
consider applying the security update using update management software, or by
checking for updates using the Microsoft Update service.
Affected Software
Windows XP Service Pack 2
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
Windows Vista Service Pack 1
Windows Vista Service Pack 2
Windows Vista x64 Edition
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
Mitigating Factors
This vulnerability only impacts Windows systems with the ISATAP interface
configured.
Workarounds
Block IP Protocol Type 41 (ISATAP) at the firewall
The ISATAP protocol is defined as protocol type 41 by RFC4214: Intra-Site
Automatic Tunnel Addressing Protocol (ISATAP). Blocking this protocol type at
the firewall will help protect systems that are behind that firewall from
attempts to exploit this vulnerability. Microsoft recommends that you block
all unsolicited inbound communication from the Internet to help prevent
attacks that may use other ports or protocols.
Disable the ISATAP IPv6 interface
To disable the ISATAP IPv6 interface, run the following command from an
elevated command prompt:
netsh interface isatap set state disabled
Note: You must be logged in as administrator or have administrative
credentials to complete this workaround.
Vulnerability Information
ISATAP IPv6 Source Address Spoofing Vulnerability - CVE-2010-0812
A spoofing vulnerability exists in the Microsoft Windows IPv6 stack due to the
way that Windows checks the inner packet's IPv6 source address in a tunneled
ISATAP packet. An attacker who successfully exploited this vulnerability could
impersonate an address to bypass edge or host firewalls. Additionally,
information could be disclosed when the targeted computer replies to the
message using the source IPv6 address that the attacker specified.
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