Rule:

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Sid:
1384

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Summary:
This event is generated when a remote user attempts to send a NOTIFY directive to an internal host's Universal Plug and Play (UPnP) server.

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Impact:
Attempted administrator access or denial of service.  A successful attack may cause a denial of service or permit the execution of arbitrary code with administrator privileges.

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Detailed Information:
The UPnP is used to find network-based devices.  Specifically, UPnP NOTIFY directives are employed to advertise the existence of UPnP devices on the network.  A vulnerability exists that permits a malformed NOTIFY directive to cause a buffer overflow on the remote host listening on UPnP.  Alternately, a malformed NOTIFY directive may be used to exhaust resources on a remote host listening on UPnP.  The buffer overflow attack may permit the execution of arbitrary code on the host with administrator privileges.

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Affected Systems:
Microsoft Windows 98, 98SE, ME, XP

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Attack Scenarios:
An attacker may obtain craft a malformed NOTIFY directive to cause a denial of service or attempt to execute arbitrary code on the victim host.

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Ease of Attack:
Simple. Exploit code is freely available.

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False Positives:
This event will be generated if external hosts are permitted to query for UPnP devices.

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False Negatives:
None Known.

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Corrective Action:
Block inbound UPnP traffic.

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Contributors:
Original rule writer unknown.
Sourcefire Research Team
Judy Novak <judy.novak@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/rbot
http://www.microsoft.com/security/encyclopedia/details.aspx?name=Win32/Sdbot

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0876
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0877

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