ET WEB_SERVER N-able N-central Authenticated importServiceFromFile XML External Entity Injection (CVE-2025-11700)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SERVER N-able N-central Authenticated importServiceFromFile XML External Entity Injection (CVE-2025-11700)";
    flow:established,to_server;
    http.uri;
    content:"/dms/services/ServerMMS"; fast_pattern;
    http.request_body;
    content:"ns1:applianceLogSubmit";
    content:"|3c 21|ENTITY|20|";
    pcre:"/^\s*?(?:\x26\x23(?:x25|37)\x3b|\x25|[a-z]+)\x20[a-z]+\x20[A-Z]+\x20[\x22\x27][^\x22]*[\x22\x27]\x3e/R";
    reference:url,horizon3.ai/attack-research/attack-blogs/n-able-n-central-from-n-days-to-0-days/;
    reference:cve,2025-11700;
    classtype:web-application-attack;
    sid:2065811; rev:1;
    metadata:affected_product N_Able, attack_target Server, tls_state TLSDecrypt, created_at 2025_11_18, cve CVE_2025_11700, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_18, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)