Rule:

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Sid:
2127

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Summary:
This event is generated when an attempt is made to access ikonboard.cgi
on a web server. This may indicate an attempt to exploit an arbitrary 
code execution vulnerability that affects Ikonboard web-based bulletin 
board software.

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Impact:
Arbitrary code execution.

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Detailed Information:
This event indicates that an attempt has been made to exploit an 
arbitrary code execution vulnerability in Ikonboard web-based bulletin 
board software. An attacker can bypass user input validation by 
inserting illegal characters into the "lang" value of a user cookie, 
which then allows the attacker to pass arbitrary Perl code to the web 
server.

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Affected Systems:
Any web server running Ikonboard bulletin board software.

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Attack Scenarios:
An attacker can provide a crafted cookie to the web server running 
Ikonboard. The web server will then attempt to execute the arbitrary 
Perl commands embedded in the cookie.

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Ease of Attack:
Simple. A proof of concept exists.

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

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False Negatives:
None known.

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Corrective Action:
An unsupported and unofficial patch is available at http://www.securityfocus.com/bid/7361/solution/.

Check the host for signs of compromise.

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

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Additional References:

Bugtraq
http://www.securityfocus.com/bid/7361

Nessus
http://cgi.nessus.org/plugins/dump.php3?id=11605

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