File: 1645.txt

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Rule:

--
Sid:
1645

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Summary:
This event is generated when an attempt is made to access /testcgi on a 
web server. This may indicate an attempt to exploit a cross-site 
scripting vulnerability that affects Ceilidh.

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Impact:
Arbitrary code execution, possible session hijack.

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Detailed Information:
This event indicates that an attempt has been made to exploit a 
cross-site scripting vulnerability in Ceilidh, web-based discussion 
software released by Lilikoi Software, Inc. An attacker can craft a URL 
that passes malicious code to testcgi.exe. If a legitimate user 
activates the URL, malicious code may be executed on the client 
computer.

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Affected Systems:
All web servers that Ceilidh 2.6 or 2.7 are vulnerable.
All clients that access Ceilidh 2.6 or 2.7 are vulnerable.

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Attack Scenarios:
An attacker may craft a script that obtains the user's session cookie, 
thereby allowing the attacker to pose as the user for the duration of 
the session.

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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 testcgi.exe, this rule may generate
an event. 

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False Negatives:
None known.

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Corrective Action:
Upgrade to the latest version of the software.

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

--
Additional References:

Bugtraq
http://www.securityfocus.com/bid/7214

Nessus
http://cgi.nessus.org/plugins/dump.php3?id=11610

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