alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"GPL FTP CEL overflow attempt"; flow:established,to_server; content:"CEL"; nocase; isdataat:100,relative; pcre:"/^CEL\s[^\n]{100}/smi"; reference:arachnids,257; reference:bugtraq,679; reference:cve,1999-0789; reference:nessus,10009; classtype:attempted-admin; sid:2100337; rev:14; metadata:created_at 2010_09_23, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_08;)