ET WEB_SPECIFIC_APPS Totolink A3700R Multiple Authentication Bypass cstecgecgi.cgi Endpoints (CVE-2025-3663 - CVE-2025-3668)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Totolink A3700R Multiple Authentication Bypass cstecgecgi.cgi Endpoints (CVE-2025-3663 - CVE-2025-3668)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:20;
    content:"/cgi-bin/cstecgi.cgi"; fast_pattern;
    http.header_names;
    content:!"|0d 0a|cookie|0d 0a|"; nocase;
    http.request_body; strip_whitespace;
    content:"|22|topicurl|22 3a 22|";
    pcre:"/^(?:setL2tpServerCfg|setUrlFilterRules|setScheduleCfg|setUPnPCfg|setWiFiEasyGuestCfg|setWiFiEasyCfg|setSmartQosCfg|setDdnsCfg)/R";
    reference:cve,2025-3665;
    reference:cve,2025-3666;
    reference:url,avender-bicycle-a5a.notion.site/CVE-1ab53a41781f804898a0effa45d0f15d;
    reference:cve,2025-3664;
    reference:cve,2025-3668;
    reference:cve,2025-3667;
    reference:cve,2025-3663;
    classtype:web-application-attack;
    sid:2061620; rev:2;
    metadata:affected_product TOTOLINK, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_04_16, cve CVE_2025_3663_CVE_2025_3668, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)