ET WEB_SPECIFIC_APPS ZendTo temp_name parameter Command Injection Attempt

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS ZendTo temp_name parameter Command Injection Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:8;
    content:"/dropoff";
    http.cookie;
    content:"zendto-session="; fast_pattern;
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|";
    content:"|22|tmp_name|22 3a 22|";
    pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R";
    reference:url,projectblack.io/blog/zendto-nday-vulnerabilities/;
    classtype:attempted-admin;
    sid:2061290; rev:1;
    metadata:affected_product ZendTo, attack_target Web_Server, tls_state TLSDecrypt, created_at 2025_04_04, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_04, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)