ET WEB_SPECIFIC_APPS Cisco RV Series Router sys_setting.htm md5_password Parameter Command Injection Attempt (CVE-2023-20117)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Cisco RV Series Router sys_setting.htm md5_password Parameter Command Injection Attempt (CVE-2023-20117)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:16;
    content:"/sys_setting.htm"; fast_pattern;
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|md5_password|22|";
    pcre:"/^.*(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24)|(?:telnetd\x20|sh|bash|wget\x20|curl\x20|cat\x20|ls\x20|IFS))+/R";
    reference:url,www.iotsec-zone.com/article/383;
    reference:cve,2023-20117;
    classtype:web-application-attack;
    sid:2063622; rev:1;
    metadata:affected_product Cisco_RV_Series, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_07_21, cve CVE_2023_20117, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_07_21, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)