GPL SMTP vrfy decode

Query · suricata

flow:to_server,established;
content:"vrfy"; nocase;
content:"decode"; distance:1; nocase;
pcre:"/^vrfy\s+decode/smi";
Raw source GPL SMTP vrfy decode · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (
    msg:"GPL SMTP vrfy decode";
    flow:to_server,established;
    content:"vrfy"; nocase;
    content:"decode"; distance:1; nocase;
    pcre:"/^vrfy\s+decode/smi";
    reference:arachnids,373;
    reference:bugtraq,10248;
    reference:cve,1999-0096;
    classtype:attempted-recon;
    sid:2100672; rev:10;
    metadata:created_at 2010_09_23, cve CVE_1999_0096, signature_severity Unknown, updated_at 2019_07_26;
)

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