alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP CWD overflow attempt"; flow:to_server,established; content:"CWD"; nocase; isdataat:100,relative; pcre:"/^CWD\s[^\n]{100}/smi"; reference:bugtraq,11069; reference:bugtraq,1227; reference:bugtraq,1690; reference:bugtraq,6869; reference:bugtraq,7251; reference:bugtraq,7950; reference:cve,1999-0219; reference:cve,1999-1058; reference:cve,1999-1510; reference:cve,2000-1035; reference:cve,2000-1194; reference:cve,2001-0781; reference:cve,2002-0126; reference:cve,2002-0405; classtype:attempted-admin; sid:2101919; rev:24; metadata:created_at 2010_09_23, cve CVE_1999_0219, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)