ET EXPLOIT Exim New-Line Injection into Spool Header File Inbound M2 (CVE-2020-28021)
Sourceet/open
CreatedMay 4, 2021
UpdatedMay 4, 2021
Classificationattempted-admin
alert smtp any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (msg:"ET EXPLOIT Exim New-Line Injection into Spool Header File Inbound M2 (CVE-2020-28021)"; flow:established,to_server; content:"MAIL|20|FROM"; content:"AUTH="; distance:0; pcre:"/^[^\+]+(?:\+[A-F0-9]{2}){4,}/R"; content:"+0A"; fast_pattern; reference:url,www.qualys.com/2021/05/04/21nails/21nails.txt; reference:cve,2020-28021; classtype:attempted-admin; sid:2032901; 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;)
References
Metadata
attack targetSMTP_Server
created at2021_05_04
deploymentInternal
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2021_05_04
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