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