GHSA-x4r9-gmw3-hxww
GeoServer has a Server-Side Request Forgery (SSRF) Vulnerability in its XML Entity Resolution
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.geoserver.web:gs-web-app | < 2.26.4 | 2.26.4 |
| Maven | org.geoserver:gs-main | < 2.26.4 | 2.26.4 |
| Maven | org.geoserver:gs-main | >= 2.27.0, < 2.27.3 | 2.27.3 |
| Maven | org.geoserver.web:gs-web-app | >= 2.27.0, < 2.27.3 | 2.27.3 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Summary
A GeoServer that uses `ENTITY_RESOLUTION_ALLOWLIST` may allow attacker to perform unauthenticated Server-Side Request Forgery (SSRF).
### Details
This vulnerability requires that GeoServer is set up to use a proxy base URL and the `ENTITY_RESOLUTION_ALLOWLIST` (default since 2.25.0):
### Impact
This vulnerability allows an attacker to cause GeoServer to make requests to an unintended location.
### Workaround
GeoServer installations are only affected by this vulnerability if they use a proxy base URL that does not contain a URL path or end with a slash (e.g., `https://somesite.org` instead of `https://somesite.org/` or `https://somesite.org/geoserver`). If the proxy base URL does not contain a path, adding a slash to the end of the URL will mitigate this vulnerability.
### Resources
https://osgeo-org.atlassian.net/browse/GEOS-11867
https://github.com/geoserver/geoserver/pull/8622
### Credits:
- Le Mau Anh Phong at Verichains Cyber Force
References
External links from the advisory. They lead to third-party sites.