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Providing online access to sensitive data makes web servers lucrative targets for attackers. A compromise of any of the web server's scripts, applications, or operating system can leak the sensitive data of millions of customers. Unfortunately, many systems for stopping data leaks require considerable effort from application developers, hindering their adoption. In this paper, the authors investigate how such leaks can be prevented with minimal developer effort. They propose CLAMP, an architecture for preventing data leaks even in the presence of web server compromises or SQL injection attacks. CLAMP protects sensitive data by enforcing strong access control on user data and by isolating code running on behalf of different users.
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