Rule:--Sid:270--Summary:This event is generated when an attempt is made to issue a Teardrop Denial of Service (DoS) attack.--Impact:Denial of Service.--Detailed Information:Teardrop exploits a vulnerability in some TCP/IP stack implementations.The program sends a specially crafted fragmented packet where the firstfragment has offset 0 and data length N and the second fragment has anoffset less than N (The fragments overlap).  The resulting packet cannotbe properly assembled.Systems may hang or crash.--Affected Systems:	Windows 95	Windows NT 4.0 SP3 and earlier	HP HPUX 10.34 and earlier	Linux kernels 2.0.31 and earlier	FreeBSD 3.0 prior to October 27, 1998--Attack Scenarios:The can be done remotely against any open UDP port using a spoofedaddress.--Ease of Attack:Simple. Tools are readily available and require little knowledge on the part of the attacker.--False Positives:None known.--False Negatives:None known.--Corrective Action:Patches are available from all affected vendors.  Newer versions fromeach vendor are not vulnerable.--Contributors:Original Rule Writer UnknownSourcefire Research TeamNigel Houghton <nigel.houghton@sourcefire.com>Snort documentation contributed by Steven Alexander<alexanders@mccd.edu>--Additional References:Bugtraq:http://www.securityfocus.com/bid/124CERT:http://www.cert.org/advisories/CA-1997-28.htmlFreeBSD:ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/old/FreeBSD-SA-98:08.fragment.asc--