Multiple buffer overflows in Sybase Adaptive Server 12.0 and 12.5 allow remote attackers to execute arbitrary code via (1) a long parameter to the xp_freedll extended stored procedure or (2) a long database name argument to the DBCC CHECKVERIFY function.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.