alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP SITE overflow attempt"; flow:to_server,established; content:"SITE"; nocase; isdataat:100,relative; pcre:"/^SITE\s[^\n]{100}/smi"; reference:cve,1999-0838; reference:cve,2001-0755; reference:cve,2001-0770; classtype:attempted-admin; sid:2101529; rev:12; metadata:created_at 2010_09_23, cve CVE_1999_0838, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)