Rule:  

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Sid:
2194

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Summary:
This event is generated when an attempt is made to access CSMailto.cgi on an internal web server. This may indicate an attempt to exploit an input validation vulnerability in a form mail script distributed by CGIScript.NET.

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Impact:
Remote execution of arbitrary code and information disclosure.

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Detailed Information:
CSMailto.cgi is a Perl script that manages multiple email forms. An attacker can use a specially crafted URL to execute shell commands on the server and/or email files from the server to a remote email address.

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Affected Systems:
Any web server running CGIScript.NET CSMailto.cgi.

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Attack Scenarios:
An attacker places shell code in a URL sent to CSMailto.cgi on the web server. The server then executes the code.

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Ease of Attack:
Simple. Exploits exist.

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False Positives:
If a legitimate remote user accesses CSMailto.cgi, this rule may generate an event.

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False Negatives:
None known.

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Corrective Action:
It is unknown if this vulnerability has been fixed. Contact the vendor, CGIScript.NET (http://www.cgiscript.net) for more information. 

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Sourcefire Technical Publications Team
Jennifer Harvey <jennifer.harvey@sourcefire.com>

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Additional References:
Bugtraq
http://www.securityfocus.com/bid/4579

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