ET WEB_SPECIFIC_APPS ConnectWise ScreenConnect - Attempted User Creation via SetupWizard with Auth Bypass CWE-288 (CVE-2024-1709)

alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SPECIFIC_APPS ConnectWise ScreenConnect - Attempted User Creation via SetupWizard with Auth Bypass CWE-288 (CVE-2024-1709)";
    flow:established,to_server;
    flowbits:set,ET.ScreenConnectAuthBypass.UserCreateAttempt;
    http.method;
    content:"POST";
    http.uri;
    content:"/SetupWizard.aspx/"; startswith;
    http.request_body;
    content:"userNameBox|3d|";
    content:"emailBox|3d|";
    content:"passwordBox|3d|";
    reference:url,github.com/watchtowrlabs/connectwise-screenconnect_auth-bypass-add-user-poc/blob/main/watchtowr-vs-ConnectWise_2024-02-21.py;
    reference:url,www.connectwise.com/company/trust/security-bulletins/connectwise-screenconnect-23.9.8;
    reference:cve,2024-1709;
    classtype:attempted-admin;
    sid:2050991; rev:1;
    metadata:attack_target Web_Server, tls_state TLSDecrypt, created_at 2024_02_21, cve CVE_2024_1709, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2024_02_21, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)