alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"GPL IMAP lsub literal overflow attempt"; flow:to_server,established; content:"LSUB"; nocase; pcre:"/\sLSUB\s[^\n]*?\s\{/smi"; byte_test:5,>,256,0,string,dec,relative; reference:bugtraq,1110; reference:cve,2000-0284; reference:nessus,10374; classtype:misc-attack; sid:2101902; rev:10; metadata:created_at 2010_09_23, confidence Medium, signature_severity Minor, updated_at 2019_07_26;)