Integer underflow in SQL Server 7.0 SP4 2000 SP4 2005 SP1 and SP2 2000 Desktop Engine (MSDE 2000) SP4 2005 Express Edition SP1 and SP2 and 2000 Desktop Engine (WMSDE); Microsoft Data Engine (MSDE) 1.0 SP4; and Internal Database (WYukon) SP2 allows remote authenticated users to execute arbitrary code via a (1) SMB or (2) WebDAV pathname for an on-disk file (aka stored backup file) with a crafted record size value which triggers a heap-based buffer overflow aka \SQL Server Memory Corruption Vulnerability.\