Rule:  --Sid:3000--Summary:This event is generated when an attempt is made to exploit a known vulnerability in the Microsoft implementation of the ASN.1 Library.--Impact:Serious. Execution of arbitrary code, DoS.--Detailed Information:A buffer overflow condition in the Microsoft implementation of the ASN.1 Library. It may be possible for an attacker to exploit this condition by sending specially crafted authentication packets to a host running a vulnerable operating system.When the taget system decodes the ASN.1 data, exploit code may be included in the data that may be excuted on the host with system level privileges. Alternatively, the malformed data may cause the service to become unresponsive thus causing the DoS condition to occur.--Affected Systems:	Microsoft Windows NT	Microsoft Windows NT Terminal Server Edition	Microsoft Windows 2000	Microsoft Windows XP	Microsoft Windows 2003--Ease of Attack:Simple. Exploit code exists.--False Positives:None known.--False Negatives:None known.--Corrective Action:Apply the appropriate vendor supplied patches.--Contributors:Sourcefire Research TeamBrian Caswell <bmc@sourcefire.com>Nigel Houghton <nigel.houghton@sourcefire.com>--References:CVEhttp://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0818US-CERThttp://www.us-cert.gov/cas/techalerts/TA04-041A.htmlMicrosofthttp://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/ms04-007.asp--