Rule:  

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Sid:
2436

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Summary:
This event is generated when an attempt is made to access a file type
that may be subject to a known vulnerability in Microsoft Windows Explorer.

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Impact:
Denial of Service (DoS) possible execution of arbitrary code.

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Detailed Information:
When processing Windows Extended Metafile Format (.emf) files, Windows
Explorer sets a buffer size based on information in the header for the
file. If a malformed header is sent, it may be possible for an attacker
to cause a DoS condition to occur. It may also be possible for an
attacker to execute code of their choosing on a vulnerable host.

WARNING
In order to avoid potential evasion techniques, http_inspect should be configured with "flow_depth 0" so that all HTTP server response traffic is inspected.

Setting flow_depth 0 will cause performance problems in some situations.
WARNING
This issue may also affect Microsoft Windows Metafile Format (.wmf)
files also.

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Affected Systems:
	Microsoft Windows XP Home, Professional and Media Center Edition
	Microsoft Windows XP Home and Professional SP-1

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Attack Scenarios:
An attacker might supply a specially crafted request for such a file
that might cause the error condiion to occur.

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Ease of Attack:
Moderate/Difficult

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Apply the appropriate vendor supplied patches

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

Microsoft:
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Gaobot
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Sasser
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Korgo
http://www.microsoft.com/security/encyclopedia/details.aspx?name=win32/rbot
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Sdbot
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Mytob
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Spybot
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Wootbot

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