ET WEB_SPECIFIC_APPS JetBrains TeamCity Authentication Bypass Attempt (CVE-2024-27198) - Admin User Creation Attempt

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SPECIFIC_APPS JetBrains TeamCity Authentication Bypass Attempt (CVE-2024-27198) - Admin User Creation Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"jsp|3d|/app/rest/users"; fast_pattern;
    content:".jsp"; within:30;
    http.request_body;
    content:"|7b|"; startswith;
    content:"|22|username|22 3a 20 22|";
    content:"|22|password|22 3a 20 22|";
    content:"|5b 7b 22|roleId|22 3a 20 22|SYSTEM_ADMIN";
    reference:cve,2024-27198;
    reference:url,www.rapid7.com/blog/post/2024/03/04/etr-cve-2024-27198-and-cve-2024-27199-jetbrains-teamcity-multiple-authentication-bypass-vulnerabilities-fixed/;
    classtype:attempted-admin;
    sid:2051506; rev:5;
    metadata:affected_product JetBrains_TeamCity, created_at 2024_03_06, cve CVE_2024_27198, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag JetBrains_TeamCity, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_11, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)