Rule:

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Sid:
1393

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Summary:
This event is generated when exploit traffic is observed that attempts to cause a buffer overflow in a Windows host running America Online (AOL) Instant Messenger (AIM).

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Impact:
Attempted user level access.  A successful attack may permit the execution of arbitrary code with the privileges of the user running AIM.

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Detailed Information:
AIM can be used for message and file exchanges as well as to play games with other AIM users.  A buffer overflow exists in AIM game request code (AddGame) that may permit the execution of arbitrary code on a Windows client AIM host with the privileges of the user running AIM.  

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Affected Systems:
Windows hosts running AIM 4.3 - 4.8.2616.

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Attack Scenarios:
An attacker may craft a malformed AIM game request causing a buffer overflow, and potentially permitting the execution of arbitrary code with the privileges of the user running AIM. 

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

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False Positives:
None known.

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False Negatives:
This event is trigger when known exploit code is run.  It may be possible that other exploit code exists that will not trigger this event.

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Corrective Action:
Upgrade to version 2001B Beta v5.18 Build #3659 or later.

Go to Preferences in AIM -> Privacy -> In "Who can contact me" check "Allow only users on my Buddy List".

Block AIM traffic into and out of your network.

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Contributors:
Original rule writer unknown.
Sourcefire Vulnerability Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0005

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