ET WEB_SERVER SonicWall SMA Unauthenticated sonicfiles CPU Exhaustion (CVE-2021-20041)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SERVER SonicWall SMA Unauthenticated sonicfiles CPU Exhaustion (CVE-2021-20041)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/fileshare/sonicfiles/sonicfiles|3f|";
    content:"RacNumber|3d|25";
    content:"Arg2|3d 2d|elol"; fast_pattern;
    reference:url,gist.github.com/jbaines-r7/83202be06be86c5677fb357759a05f34;
    reference:cve,2021-20041;
    classtype:web-application-attack;
    sid:2061559; rev:1;
    metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_14, cve CVE_2021_20041, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)