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Web applications are increasingly popular victims of security attacks. Injection attacks, such as Cross Site Scripting or SQL Injection, are a persistent problem. Even though developers are aware of them, the suggested best practices for protection are error prone: unless all user input is consistently filtered, any application may be vulnerable. When hosting web applications, administrators face a dilemma: they can only deploy applications that are trusted or they risk their system's security. To prevent injection vulnerabilities, the authors introduce PHP Aspis: a source code transformation tool that applies partial taint tracking at the language level.
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