ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/hostcheck_validate (CVE-2023-27997)

Query · suricata

flow:established,to_server;
threshold:type limit, track by_src, count 1, seconds 120;
http.method;
content:"GET";
http.uri;
content:"/remote/hostcheck_validate"; fast_pattern; startswith;
content:"enc"; distance:0;
target:dest_ip;
Raw source ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/hostcheck_validate (CVE-2023-27997) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/hostcheck_validate (CVE-2023-27997)";
    flow:established,to_server;
    threshold:type limit, track by_src, count 1, seconds 120;
    http.method;
    content:"GET";
    http.uri;
    content:"/remote/hostcheck_validate"; fast_pattern; startswith;
    content:"enc"; distance:0;
    reference:cve,2023-27997;
    reference:url,blog.lexfo.fr/xortigate-cve-2023-27997.html;
    classtype:attempted-admin;
    sid:2046251; rev:1;
    metadata:affected_product Fortigate, attack_target Networking_Equipment, created_at 2023_06_13, cve CVE_2023_27997, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2023_06_13;
    target:dest_ip;
)

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