Rule:  

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Sid:
2225

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Summary:
This event is generated when an attempt is made to access gozila.cgi on an internal web server. This may indicate an attempt to exploit a denial of service vulnerability in the Linksys Etherfast BEFSR41 Cable/DSL Router web interface.

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Impact:
Denial of service.

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Detailed Information:
The Linksys Etherfast BEFSR41 Cable/DSL router web interface, Gozila.cgi, contains a denial of service vulnerability where, if a request is made for gozila.cgi is made without any arguments, the router crashes.

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Affected Systems:
Linksys Etherfast BEFSR41 Cable/DSL routers running firmware version 1.42.7 or earlier.

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Attack Scenarios:
An attacker sends http://routerhostname/gozilla.cgi? to a vulnerable router (where routerhostname is the router's host name). The router will crash.
 
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Ease of Attack:
Simple.

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

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False Negatives:
None known.

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Corrective Action:
Upgrade your router firmware to 1.43 or higher.

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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/6086

CVE
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1236

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