ET EXPLOIT Exim/Dovecot Possible MAIL FROM Command Execution

Query · suricata

flow:to_server,established;
content:"${IFS}"; fast_pattern;
content:"mail from|3a|"; nocase;
pcre:"/^[^\r\n]*?\x60[^\x60]*?\$\{IFS\}/R";
Raw source ET EXPLOIT Exim/Dovecot Possible MAIL FROM Command Execution · 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 -> $HOME_NET 25 (
    msg:"ET EXPLOIT Exim/Dovecot Possible MAIL FROM Command Execution";
    flow:to_server,established;
    content:"${IFS}"; fast_pattern;
    content:"mail from|3a|"; nocase;
    pcre:"/^[^\r\n]*?\x60[^\x60]*?\$\{IFS\}/R";
    reference:url,redteam-pentesting.de/de/advisories/rt-sa-2013-001/-exim-with-dovecot-typical-misconfiguration-leads-to-remote-command-execution;
    classtype:attempted-admin;
    sid:2016835; rev:3;
    metadata:created_at 2013_05_08, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;
)

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