ET EXPLOIT vBulletin 5.x Unauthenticated Remote Code Execution (CVE-2019-16759) M1

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT vBulletin 5.x Unauthenticated Remote Code Execution (CVE-2019-16759) M1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"routestring"; fast_pattern;
    content:"ajax"; within:100;
    content:"render"; within:9;
    content:"widget_php"; within:13;
    content:"widgetConfig"; nocase;
    content:"code"; within:7;
    content:"echo"; distance:0; nocase;
    content:"shell_exec"; nocase; within:13;
    reference:url,seclists.org/fulldisclosure/2019/Sep/31;
    classtype:attempted-admin;
    sid:2028621; rev:3;
    metadata:affected_product Web_Server_Applications, attack_target Server, created_at 2019_09_25, cve CVE_2019_16759, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2020_08_19, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)