alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP serv-u directory transversal"; flow:to_server,established; content:".%20."; nocase; fast_pattern:only; reference:bugtraq,2052; reference:cve,2001-0054; classtype:bad-unknown; sid:2100360; rev:9; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)