alert ftp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"GPL FTP SITE ZIPCHK overflow attempt"; flow:established,to_server; content:"SITE"; nocase; content:"ZIPCHK"; distance:1; nocase; isdataat:100,relative; pcre:"/^SITE\s+ZIPCHK\s[^\n]{100}/smi"; reference:cve,2000-0040; classtype:attempted-admin; sid:2101921; rev:8; metadata:created_at 2010_09_23, cve CVE_2000_0040, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_08;)