Rule:

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Sid:
973

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Summary:
This event is generated when an attempt is made to exploit a buffer overflow associated with a file with a .idc extension. 

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Impact:
Remote access.  This attack may permit the execution of arbitrary commands on the victim server.

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Detailed Information:
Microsoft Internet Information Service (IIS) supports files extensions including .idc that call the ISM.DLL.  A buffer overflow vulnerability exists in ISM.DLL code when it receives a malformed request, permitting the execution of arbitrary code.  

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Affected Systems:
IIS 4.0 hosts

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Attack Scenarios:
An attacker can send a malformed request of a .idc file that causes a buffer overflow.

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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:
None Known.

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Corrective Action:
Upgrade to a more current version of IIS.
 
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Contributors:
Original rule writer unknown
Modified by Brian Caswell <bmc@sourcefire.com>
Sourcefire 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-1999-0874

Bugtraq:
http://www.securityfocus.com/bid/307

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