Detect JetBrains TeamCity Relative Path Traversal (CVE-2024-27199) in CrowdStrike LogScale
Detects exploitation of CVE-2024-27199, a relative path traversal vulnerability in JetBrains TeamCity on-premises. Unauthenticated attackers can traverse directory paths in the TeamCity web server to access restricted endpoints and files outside the intended web root, potentially leading to information disclosure or authentication bypass chained with CVE-2024-27198.
MITRE ATT&CK
LogScale Detection Query
#event_simpleName=NetworkReceiveAccepted OR #event_simpleName=HttpRequest
| LocalPort = 8111 OR LocalPort = 443 OR LocalPort = 80
| HttpPath = /(?i)\/(?:res|update|icons|plugins)\//
| HttpPath = /(?i)(?:%2e%2e|%252e%252e|\.\.\/)/
| HttpPath = /(?i)(?:WEB-INF|web\.xml|server\.xml|\/admin\/|\/config\/)/
| stats count() as request_count by RemoteAddressIP4, HttpPath, bin(timestamp, 5min)
| where request_count >= 3
| sort request_count desc
| rename RemoteAddressIP4 as attacker_ip, HttpPath as traversal_pathCrowdStrike Falcon LogScale query detecting CVE-2024-27199 exploitation via network events on TeamCity default ports. Identifies repeated path traversal requests containing encoded dot-dot sequences targeting sensitive server paths.
Data Sources
Required Tables
False Positives & Tuning
- CrowdStrike-protected hosts running authorized vulnerability scans against TeamCity
- Red team operations with approved scope on TeamCity server endpoints
- Misconfigured applications making API calls with relative path segments to TeamCity
- Load balancer health probes that traverse URL paths during endpoint validation
Other platforms for CVE-2024-27199
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1TeamCity Path Traversal to WEB-INF via Encoded Dots
Expected signal: HTTP GET request to /res/..%2f..%2f..%2fWEB-INF/web.xml logged in web server access logs with the attacker's IP. Response code 200 if vulnerable, 400/404 if patched or blocked.
- Test 2TeamCity Path Traversal via Double-Encoded Sequences
Expected signal: HTTP request containing %252f in URL path to TeamCity /update/ endpoint visible in web access logs.
- Test 3Automated Traversal Scan Simulation (Multiple Paths)
Expected signal: Five HTTP GET requests from the same source IP to /res/ URL paths containing %2f traversal sequences within a 10-second window, visible in web server access logs.
- Test 4Chain CVE-2024-27199 with Admin Configuration Read
Expected signal: HTTP GET to /icons/ endpoint with traversal sequence targeting conf/database.properties. HTTP 200 response body containing JDBC connection string indicates successful exploitation.
Unlock Pro Content
Get the full detection package for CVE-2024-27199 including response playbook, investigation guide, and atomic red team tests.