Thanks xStainDx and WishX for this. The Microsoft Data Access Components (MDAC) provide a number of supporting technologies for accessing and using databases. Included among these functions is the underlying support for the T-SQL OpenRowSet command. A security vulnerability results because the MDAC functions underlying OpenRowSet contain an unchecked buffer.
An attacker who submitted a database query containing a specially malformed parameter within a call to OpenRowSet could overrun the buffer, either for the purpose of causing the SQL Server to fail or causing the SQL Server service to take actions dictated by the attacker.
Download: Patch for MDAC 2.5
Download: Patch for MDAC 2.6
Download: Patch for MDAC 2.7
View: More information at Microsoft Security Bulletin ID MS02-40
