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Abstract:Tbis paper presents the design and implementation of an on-the-fly damage assessment and repair tool for intrusion tolerant commercial database applications, called ODAR. ODAR is a COTS-DBMS-specific implementation of a general on-the-fly damage assessment and repair approach developed by P. Ammann, S. Jajodia, and P. Liu in [8J. Tbe general approach, given a set of malicious transactions reported by an intrusion detector,locates and repairs the damage caused by each malicious transaction on the database, along with the damage caused by any benign transaction that is affected, directly or indirectly, by a malicious transaction. Tbe general approach locates and repairs damage on-the-fly without the need to periodically halt normal transaction processing. In this paper, the development of the first ODAR prototype, which is for Oracle Server 8.1.6, is discussed. ODAR uses triggers and transaction profiles to keep track of the read and write operations of transactions, locates damage by tracing the affecting relationships among transactions along the history , and repairs damage by composing and executing some specific UNDO transactions. ODAR is transparent to on-going user transactions and very general. In addition to Oracle, it can be easily adapted to support many other database application platforms such as Microsoft SQL Server, Sybase, and Informix. To our best knowledge, ODAR is the first tool that can do automatic on-the-fly damage assessment and repair for commercial database applications.