It indicates a Denial-of-Service (DoS) vulnerability in Microsoft SQL Server.
There exists a vulnerability with the processing of Tabular Data Stream (TDS) headers in Microsoft SQL Server 7.0. Due to inadequate input validation, a remote attacker can crash a target server by passing it a malformed TDS packet.
Impact
Attackers can cause DoS on the victim server.
Affected Products
Any unprotected SQL Server 7.0 is vulnerable to the attack.
Apply appropriate patches from Microsoft at http://www.microsoft.com/technet/security/bulletin/ms99-059.mspx or upgrade the server to the latest non-vulnerable version.
