ET EXPLOIT [PT Security] Exim <4.90.1 Base64 Overflow RCE (CVE-2018-6789)

Query · suricata

flow:established,to_server,only_stream;
content:"|0D 0A|AUTH";
pcre:"/AUTH\s+\S+\s+(?:[a-zA-Z0-9\+\/=]{4})*+[a-zA-Z0-9\+\/=]{3}\s/";
Raw source ET EXPLOIT [PT Security] Exim <4.90.1 Base64 Overflow RCE (CVE-2018-6789) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp any any -> $HOME_NET 25 (
    msg:"ET EXPLOIT [PT Security] Exim <4.90.1 Base64 Overflow RCE (CVE-2018-6789)";
    flow:established,to_server,only_stream;
    content:"|0D 0A|AUTH";
    pcre:"/AUTH\s+\S+\s+(?:[a-zA-Z0-9\+\/=]{4})*+[a-zA-Z0-9\+\/=]{3}\s/";
    reference:cve,2018-6789;
    reference:url,devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/;
    reference:url,github.com/ptresearch/AttackDetection/blob/master/CVE-2018-6789/cve-2018-6789.rules;
    classtype:attempted-admin;
    sid:2025427; rev:1;
    metadata:attack_target SMTP_Server, created_at 2018_03_13, cve CVE_2018_6789, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2019_07_26;
)

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