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Detect FTP injection<br />
FTP attack uses unsollicited 227 response to fool the helper<br />
Normally a 227 follows a PASV command<br />
We can detect this using rules<br />
Éric Leblond, Victor Julien (OISF) <strong>The</strong> <strong>menace</strong> <strong>came</strong> <strong>from</strong> <strong>below</strong> <strong>Hack</strong>.<strong>lu</strong> 2012 40 / 66