GPL SMTP EXPN overflow attempt

Query · suricata

flow:to_server,established;
content:"EXPN"; nocase;
isdataat:255,relative;
content:!"|0a|"; within:255;
pcre:"/^EXPN[^\n]{255}/smi";
Raw source GPL SMTP EXPN overflow attempt · 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 EXPN overflow attempt";
    flow:to_server,established;
    content:"EXPN"; nocase;
    isdataat:255,relative;
    content:!"|0a|"; within:255;
    pcre:"/^EXPN[^\n]{255}/smi";
    reference:bugtraq,6991;
    reference:bugtraq,7230;
    reference:cve,2002-1337;
    reference:cve,2003-0161;
    classtype:attempted-admin;
    sid:2102259; rev:9;
    metadata:created_at 2010_09_23, cve CVE_2002_1337, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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