ET EXPLOIT Exim Stack Exhaustion via BDAT Error Inbound (CVE-2020-28019)

Query · suricata

flow:established,to_server;
content:"BDAT|20|";
pcre:"/^[^\r\n]{50,}/R";
content:"BDAT|20|"; distance:0; fast_pattern;
Raw source ET EXPLOIT Exim Stack Exhaustion via BDAT Error Inbound (CVE-2020-28019) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (
    msg:"ET EXPLOIT Exim Stack Exhaustion via BDAT Error Inbound (CVE-2020-28019)";
    flow:established,to_server;
    content:"BDAT|20|";
    pcre:"/^[^\r\n]{50,}/R";
    content:"BDAT|20|"; distance:0; fast_pattern;
    reference:url,www.qualys.com/2021/05/04/21nails/21nails.txt;
    reference:cve,2020-28019;
    classtype:attempted-admin;
    sid:2032903; rev:1;
    metadata:attack_target SMTP_Server, created_at 2021_05_04, cve CVE_2020_28019, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_04;
)

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