ET EXPLOIT Possible EXIM DoS (CVE-2019-16928)

Query · suricata

flow:established,to_server;
content:"EHLO "; depth:5;
isdataat:5000,relative;
content:!"|0a|"; within:500;
Raw source ET EXPLOIT Possible EXIM DoS (CVE-2019-16928) · 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 -> $SMTP_SERVERS any (
    msg:"ET EXPLOIT Possible EXIM DoS (CVE-2019-16928)";
    flow:established,to_server;
    content:"EHLO "; depth:5;
    isdataat:5000,relative;
    content:!"|0a|"; within:500;
    reference:cve,2019-16928;
    reference:url,bugs.exim.org/show_bug.cgi?id=2449;
    reference:url,git.exim.org/exim.git/patch/478effbfd9c3cc5a627fc671d4bf94d13670d65f;
    classtype:attempted-admin;
    sid:2028636; rev:3;
    metadata:attack_target SMTP_Server, created_at 2019_09_30, cve CVE_2019_16928, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Critical, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_01;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.