alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Sitecore CMS CSRFTOKEN Deserialization Remote Code Execution Attempt (CVE-2019-9874)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/sitecore/shell/Applications/Security/CreateNewUser/CreateNewUser.aspx"; fast_pattern; http.cookie; content:"|5f 5f|CSRFCOOKIE|3d|"; http.request_body; content:"|5f 5f|CSRFTOKEN|3d|"; startswith; pcre:"/^[a-zA-Z0-9\x2f\x2b\x3d]{32}/R"; reference:cve,2019-9874; reference:url,www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf; classtype:attempted-admin; sid:2061119; rev:2; metadata:affected_product Sitecore_CMS, attack_target Web_Server, tls_state plaintext, created_at 2025_03_26, cve CVE_2019_9874, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2025_03_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)