ET HUNTING XML External Entity Injection Inbound M3

Query · suricata

flow:established,to_client;
http.response_body;
content:"ENTITY";
pcre:"/^\x20*?(?:\x26\x23(?:x25|37)\x3b|\x25|\x26percnt\x3b)?\x20*?(?P<name>[a-zA-Z]+)\x20*?[A-Z]+\x20*?(?:[\x22\x27]|\x2bACI\x2d|\x26quot\x3b)[^\x22]*?(?:[\x22\x27]|\x2bACI|\x26quot\x3b).*?[\x25\x26](?P=name)/Rs";
target:src_ip;
Raw source ET HUNTING XML External Entity Injection Inbound M3 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET HUNTING XML External Entity Injection Inbound M3";
    flow:established,to_client;
    http.response_body;
    content:"ENTITY";
    pcre:"/^\x20*?(?:\x26\x23(?:x25|37)\x3b|\x25|\x26percnt\x3b)?\x20*?(?P<name>[a-zA-Z]+)\x20*?[A-Z]+\x20*?(?:[\x22\x27]|\x2bACI\x2d|\x26quot\x3b)[^\x22]*?(?:[\x22\x27]|\x2bACI|\x26quot\x3b).*?[\x25\x26](?P=name)/Rs";
    classtype:unknown;
    sid:2066046; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2025_12_05, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Significant, confidence Medium, signature_severity Major, updated_at 2025_12_05;
    target:src_ip;
)

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