alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"ET EXPLOIT ProFTPD .message file overflow attempt"; flow:established,to_server; flowbits:isset,BE.ftp.message; flowbits:unset,BE.ftp.message; content:"CWD "; depth:4; nocase; reference:url,www.milw0rm.com/exploits/2856; classtype:misc-attack; sid:2003197; rev:9; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_15;)