In dbisamsv.TServerThread.DoReadAbsoluteRecordBlock:

...
Pack(TempResult,SizeOf(Word));
PackCursorInfo(TempDataCursor);
Pack(TempRecordsToGet,SizeOf(Integer));
Pack(TempRecordsBuffer^,(TempRecordsToGet*TempDataCursor.RecordSize));
Pack(TempBookmarksBuffer^,(TempRecordsToGet*TempDataCursor.BookmarkSize));

   // after that point FReceiveBufferSize = 143346 bytes

EndPack;

   // in EndPack procedure FReplyHeader.TotalReplySize evaluates to 143352 bytes
   // and DataEngine.Encrypt procedure corrupts 6 bytes of memory that are not
   // part of FReceiveBuffer memory block

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 Comments

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This issue only affected encrypted connections directly, but could possibly cause other issues due to the memory overwrite.

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 Resolution

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Fixed Problem on 1/20/2008 in version 4.26 build 2

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 Products Affected

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DBISAM Additional Software and Utilities
DBISAM ODBC Client-Server
DBISAM ODBC Client-Server with Source
DBISAM ODBC Standard
DBISAM ODBC Standard with Source
DBISAM ODBC Trial
DBISAM VCL Client-Server
DBISAM VCL Client-Server with Source
DBISAM VCL Standard
DBISAM VCL Standard with Source
DBISAM VCL Trial