GPL POP3 APOP USER overflow attempt

Query · suricata

flow:to_server,established;
content:"APOP"; nocase;
isdataat:256,relative;
pcre:"/^APOP\s+USER\s[^\n]{256}/smi";
Raw source GPL POP3 APOP USER 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 -> $HOME_NET 110 (
    msg:"GPL POP3 APOP USER overflow attempt";
    flow:to_server,established;
    content:"APOP"; nocase;
    isdataat:256,relative;
    pcre:"/^APOP\s+USER\s[^\n]{256}/smi";
    reference:bugtraq,9794;
    classtype:attempted-admin;
    sid:2102409; rev:2;
    metadata:created_at 2010_09_23, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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