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AUSCERT External Security Bulletin Redistribution
ESB-2008.0792 -- [Win]
MS08-047 - Vulnerability in IPsec Policy Processing Could
Allow Information Disclosure
13 August 2008
AusCERT Security Bulletin Summary
Operating System: Windows Server 2008
Impact: Access Confidential Data
CVE Names: CVE-2008-2246
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Microsoft Security Bulletin MS08-047 - Important
Vulnerability in IPsec Policy Processing Could Allow Information Disclosure
Published: August 12, 2008
This update resolves a privately reported vulnerability in the way
certain Windows Internet Protocol Security (IPsec) rules are applied.
This vulnerability could cause systems to ignore IPsec policies and
transmit network traffic in clear text. This, in turn, would disclose
information intended to be encrypted on the network. An attacker
viewing the traffic on the network would be able to view and possibly
modify the contents of the traffic. Note that this vulnerability would
not allow an attacker to execute code or to elevate their user rights
directly. It could be used to collect useful information to try to
further compromise the affected system or network.
This update is rated Important for all supported versions of Windows
Vista and Windows Server 2008. For more information, see the
subsection, Affected Software, in this section.
Recommendation. Microsoft recommends that customers apply the update
at the earliest opportunity.
Windows Vista and Windows Vista Service Pack 1
Windows Vista x64 Edition and Windows Vista x64 Edition Service
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for x64-based Systems
Windows Server 2008 for Itanium-based Systems
IPsec Policy Information Disclosure Vulnerability - CVE-2008-2246
An information disclosure vulnerability exists in the manner in which
IPsec policies are imported to Windows Server 2008 domains from
Windows Server 2003 domains. This vulnerability could cause systems to
ignore IPsec policies and transmit network traffic in clear text.
This, in turn, would potentially disclose information intended to be
encrypted on the network. An attacker intercepting the traffic on the
network would be able to view and possibly modify the contents of the
traffic. Note that this vulnerability would not allow an attacker to
execute code or to elevate their user rights directly. It could be
used to collect useful information to try to further compromise the
Workarounds for IPsec Policy Information Disclosure Vulnerability -
Do not select the "Default Response Rule" during IPsec policy creation
or uncheck this rule from existing policies as this rule is no longer
valid on Windows Vista and Windows Server 2008 and is only applicable
on earlier versions of Windows. To emulate this rule in Windows Vista
and Windows Server 2008, refer to Microsoft Knowledge Base Article
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