ET WEB_SPECIFIC_APPS Fortinet FortiWeb Out of Bounds Access via HTTP Cookie (CVE-2025-52970)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Fortinet FortiWeb Out of Bounds Access via HTTP Cookie (CVE-2025-52970)";
    flow:established,to_server;
    http.uri;
    content:"/api/"; startswith;
    http.cookie;
    content:"APSCOOKIE_FWEB_"; fast_pattern;
    content:"Era|3d|";
    pcre:"/^[2-9](?:$|\x26)/R";
    content:"Payload|3d|";
    content:"AuthHash|3d|";
    reference:url,pwner.gg/blog/2025-08-13-fortiweb-cve-2025-52970;
    reference:cve,2025-52970;
    classtype:web-application-attack;
    sid:2064933; rev:1;
    metadata:affected_product FortiWeb, attack_target Server, tls_state TLSDecrypt, created_at 2025_09_25, cve CVE_2025_52970, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_25, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)