ET WEB_SERVER SonicWall SMA Unauthenticated Heap Buffer Overflow (CVE-2021-20045)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SERVER SonicWall SMA Unauthenticated Heap Buffer Overflow (CVE-2021-20045)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/fileshare/sonicfiles|2f 3f|"; fast_pattern;
    content:"Domn|3d|";
    pcre:"/^[^\x26]{128,}/R";
    content:"RacNumber|3d|36";
    reference:url,www.nccgroup.com/us/research-blog/technical-advisory-sonicwall-sma-100-series-multiple-unauthenticated-heap-based-and-stack-based-buffer-overflow-cve-2021-20045/;
    reference:cve,2021-20045;
    classtype:web-application-attack;
    sid:2061732; rev:1;
    metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_18, cve CVE_2021_20045, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_18, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)