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Today web servers are ubiquitous having become critical infrastructures of many organizations. However, they are still one of the most vulnerable parts of organizations infrastructure. Exploits are many times used by worms to fast propagate across the full Internet being web servers one of their main targets. New exploit techniques have arouse in the last few years that have rendered useless traditional IDS techniques based on signature identification. Exploits use polymorphism (code encryption) and metamorphism (code obfuscation) to evade detection from signature-based IDSs.
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