alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS JetBrains TeamCity Authentication Bypass Attempt (CVE-2024-27199) M4"; flow:established,to_server; http.method; pcre:"/^(GE|POS)T$/"; http.uri; pcre:"/^\x2f(res|update|\x2ewell-known\x2facme-challenge)\x2f/"; content:"|2e 2e|"; content:"/app/oauth/space/createBuild.html"; endswith; fast_pattern; reference:cve,2024-27199; 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:bad-unknown; sid:2051512; rev:2; metadata:affected_product JetBrains_TeamCity, created_at 2024_03_06, cve CVE_2024_27199, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag JetBrains_TeamCity, tag CVE_2024_27199, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_26, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)