Rule History

alert smtp any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (msg:"ET EXPLOIT Exim New-Line Injection into Spool Header File Inbound M1 (CVE-2020-28021)"; flow:established,to_server; content:"MAIL|20|FROM"; content:"AUTH="; distance:0; pcre:"/^[^\+]+\+0A/R"; content:"+0A"; fast_pattern; reference:url,www.qualys.com/2021/05/04/21nails/21nails.txt; reference:cve,2020-28021; classtype:attempted-admin; sid:2032900; rev:1; metadata:attack_target SMTP_Server, created_at 2021_05_04, cve CVE_2020_28021, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_04;)