Rule:--Sid:291--Summary:This event is generated when an attempt is made to exploit a buffer overflow in the Cassandra NNTP service.--Impact:Denial of Service.--Detailed Information:The denial of service is caused by providing an unusually long loginname.  The rule looks for a data payload of over 512 characters.--Affected Systems:	Cassandra NNTP server v1.10--Attack Scenarios:The attack is done remotely and causes denial of service.--Ease of Attack:Simple.  An exploit is readily available.--False Positives:None known.--False Negatives:None known.--Corrective Action:Install the available security patches from your vendor.--Contributors:Original Rule Writer UnknownSourcefire Research TeamNigel Houghton <nigel.houghton@sourcefire.com>Snort documentation contributed by Steven Alexander<alexander.s@mccd.edu>--Additional References:Arachnids:http://www.whitehats.com/info/IDS274CVE:http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCAN-2000-0341--