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A New Policy to Defend against SQL Injection Attacks

ZHOU Jing-Li WANG Xiao-Feng YU Sheng-Sheng XIA Hong-Tao(College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074)  
SQL injection, which is a popular and easy to carry out method of remote attacks, poses a major thread to application level security. In this paper, we introduce Pre-analysis of SQL syntax, a fire-new policy to detect and prevent SQL injection attacks. First, all SQL injection attacks are categorized into some classes and for each class a specified syntagma is abstracted and recorded. Then, the user input is picked up and embedded into prepared SQL sentences. Finally, these embedded SQL sentences are syntactically checked. Any find of underlying syntagma recorded as SQL injection tells a SQL injection attack. The implementation of new policy needs neither modification to Web program codes nor any patch to software of server platform. Experiments prove that new policy provides close to perfect detection rate and avoids the conflict between low false positive rate and low false negative rate.
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