alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"GPL EXPLOIT formmail arbitrary command execution attempt"; flow:to_server,established; content:"/formmail"; nocase; http_uri; content:"%0a"; nocase; reference:arachnids,226; reference:bugtraq,1187; reference:bugtraq,2079; reference:cve,1999-0172; reference:cve,2000-0411; reference:nessus,10076; reference:nessus,10782; classtype:web-application-attack; sid:2101610; rev:13; metadata:created_at 2010_09_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)