ET WEB_SPECIFIC_APPS Hytec popen.cgi command Parameter Command Injection Attempt (CVE-2022-36553)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Hytec popen.cgi command Parameter Command Injection Attempt (CVE-2022-36553)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/cgi-bin/popen.cgi|3f|"; startswith; fast_pattern;
    content:"command|3d|"; distance:0;
    pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R";
    reference:url,gist.github.com/Nwqda/b27418ab801eb0b9cdbe8d042cb0249b;
    reference:cve,2022-36553;
    classtype:attempted-admin;
    sid:2072397; rev:1;
    metadata:affected_product Hytec, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_10_08, cve CVE_2022_36553, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_10_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)