alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP LIST directory traversal attempt"; flow:established,to_server; content:"LIST"; nocase; content:".."; distance:1; content:".."; distance:1; reference:cve,2002-1054; reference:bugtraq,2618; reference:nessus,11112; reference:cve,2001-0680; classtype:protocol-command-decode; sid:2101992; rev:12; metadata:created_at 2010_09_23, cve CVE_2001_0680, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_26, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1083, mitre_technique_name File_And_Directory_Discovery; target:dest_ip;)