alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"GPL IMAP authenticate literal overflow attempt"; flow:established,to_server; content:"AUTHENTICATE"; nocase; pcre:"/\sAUTHENTICATE\s[^\n]*?\{/smi"; byte_test:5,>,256,0,string,dec,relative; reference:cve,1999-0042; reference:nessus,10292; classtype:misc-attack; sid:2102105; rev:6; metadata:created_at 2010_09_23, confidence Medium, signature_severity Minor, updated_at 2019_07_26;)