ET WEB_SPECIFIC_APPS FreePBX Authentication Bypass via Forged Authorization Header (CVE-2025-61678)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS FreePBX Authentication Bypass via Forged Authorization Header (CVE-2025-61678)";
    flow:established,to_server;
    http.uri;
    content:"/admin/"; startswith;
    content:"|2e|php|3f|";
    http.header;
    content:"authorization|3a 20|basic cmfuzg9to"; fast_pattern; nocase;
    http.method;
    content:"POST";
    reference:url,horizon3.ai/attack-research/the-freepbx-rabbit-hole-cve-2025-66039-and-others/;
    reference:cve,2025-61678;
    classtype:web-application-attack;
    sid:2067123; rev:1;
    metadata:affected_product FreePBX, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_27, cve CVE_2025_61678, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)