alert ftp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"GPL FTP SITE NEWER overflow attempt"; flow:to_server,established; content:"SITE"; nocase; content:"NEWER"; distance:0; nocase; isdataat:100,relative; pcre:"/^SITE\s+NEWER\s[^\n]{100}/smi"; reference:bugtraq,229; reference:cve,1999-0800; classtype:attempted-admin; sid:2101920; rev:8; metadata:created_at 2010_09_23, cve CVE_1999_0800, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)