ET EXPLOIT RoundCube Webmail Persistent XSS Attempt (CVE-2023-43770)

Query · suricata

flow:established,to_server;
content:"Content-Type: text/plain|3b|";
content:"|0a 0a 5b 3c|"; fast_pattern;
pcre:"/^[^\x3e\x0d\x0a]*?(?:[\x20\x27\x22\x2f]on[a-z]+\x3d|(?:\x3cs(?:cript[\x3a\x3e\x20\x2b\x2f]|tyle\x3d)|\x3ciframe[\x20\x2f]))/R";
Raw source ET EXPLOIT RoundCube Webmail Persistent XSS Attempt (CVE-2023-43770) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp any any -> [$SMTP_SERVERS,$HOME_NET] any (
    msg:"ET EXPLOIT RoundCube Webmail Persistent XSS Attempt (CVE-2023-43770)";
    flow:established,to_server;
    content:"Content-Type: text/plain|3b|";
    content:"|0a 0a 5b 3c|"; fast_pattern;
    pcre:"/^[^\x3e\x0d\x0a]*?(?:[\x20\x27\x22\x2f]on[a-z]+\x3d|(?:\x3cs(?:cript[\x3a\x3e\x20\x2b\x2f]|tyle\x3d)|\x3ciframe[\x20\x2f]))/R";
    reference:cve,2023-43770;
    classtype:attempted-user;
    sid:2051827; rev:2;
    metadata:attack_target Networking_Equipment, created_at 2024_03_28, cve CVE_2023_43770, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2026_01_14;
)

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