ET WEB_SPECIFIC_APPS ComFast mbox-config ntp_timezone timestr Parameter Command Injection Attempt (CVE-2026-2823, CVE-2026-2537)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS ComFast mbox-config ntp_timezone timestr Parameter Command Injection Attempt (CVE-2026-2823, CVE-2026-2537)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/cgi-bin/mbox-config|3f|"; fast_pattern; startswith;
    content:"method|3d|SET";
    content:"section|3d|ntp_timezone";
    http.request_body;
    content:"|22|timestr|22|";
    pcre:"/^(?:\x3a(?:\x20\x22|\x22))?[^\x2c\x7d$]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R";
    reference:url,github.com/jinhao118/cve/blob/main/ComFast%20CF-AC100-V2.6.0.8_2.md;
    reference:cve,2026-2823;
    reference:cve,2026-2537;
    classtype:attempted-admin;
    sid:2068153; rev:1;
    metadata:affected_product ComFast, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_03_11, cve CVE_2026_2823_CVE_2026_2537, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_03_11, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)