cvelistv5 - cve-2025-47952

cve-2025-47952

Vulnerability from cvelistv5

Published

2025-05-30 03:37

Modified

2025-05-30 12:44

Severity ?

2.9 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Summary

Traefik allows path traversal using url encoding

References

▼	URL	Tags
	security-advisories@github.com	https://github.com/traefik/traefik/commit/08d5dfee0164aa54dd44a467870042e18e8d3f00
	security-advisories@github.com	https://github.com/traefik/traefik/releases/tag/v2.11.25
	security-advisories@github.com	https://github.com/traefik/traefik/releases/tag/v3.4.1
	security-advisories@github.com	https://github.com/traefik/traefik/security/advisories/GHSA-vrch-868g-9jx5

Impacted products

▼	Vendor	Product
	traefik	traefik

Show details on NVD website

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ghsa-vrch-868g-9jx5

Vulnerability from github

Published

2025-05-28 14:25

Modified

2025-05-30 15:17

Severity ?

2.9 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Summary

Traefik allows path traversal using url encoding

Details

Impact

There is a potential vulnerability in Traefik managing the requests using a PathPrefix, Path or PathRegex matcher.

When Traefik is configured to route the requests to a backend using a matcher based on the path, if the URL contains a URL encoded string in its path, it’s possible to target a backend, exposed using another router, by-passing the middlewares chain.

Example

yaml apiVersion: traefik.io/v1alpha1 kind: IngressRoute metadata: name: my-service spec: routes: - match: PathPrefix(‘/service’) kind: Rule services: - name: service-a port: 8080 middlewares: - name: my-middleware-a - match: PathPrefix(‘/service/sub-path’) kind: Rule services: - name: service-a port: 8080

In such a case, the request http://mydomain.example.com/service/sub-path/%2e%2e/other-path will reach the backend my-service-a without operating the middleware my-middleware-a unless the computed path is http://mydomain.example.com/service/other-path and should be computes by the first router (operating my-middleware-a).

Patches

https://github.com/traefik/traefik/releases/tag/v2.11.25
https://github.com/traefik/traefik/releases/tag/v3.4.1

For more information

If you have any questions or comments about this advisory, please open an issue.

Original Description

### Summary Path traversal with "/../" using URL encodings ("/%2e%2e") allows for circumventing routing rules. ### Details When having defined a route, you can path traverse using the URL encoded variant of /../ and reach endpoints that are not made publicly available. This issue has been found and fixed earlier with regular /../ and has been fixed in this CVE. This URL encoding trick works around that https://nvd.nist.gov/vuln/detail/CVE-2025-32431 Simply implementing a check on the URL encoding won't be sufficient as path traversal can take numerous formats. See examples here: https://book.hacktricks.wiki/en/pentesting-web/file-inclusion/index.html ### PoC Setup a service with two endpoints: "/public" and "/private", which returns a 200 OK for both Setup a Traefik proxy with a single route which points to the service using path /public Regular requests to traefik /public will return 200 OK and to /private should return 404 (response by Traefik) When making a request to /public/%2e%2e/private you should receive a 200 OK. ### Impact Impacts all traefik implementations with path prefix routes that expose only part of the downstream api ### Suggestion Provide configuration property which disables all path traversals. Steps: 1. Decode URL 2. Evaluate and construct relative path (do traversal before route evaluation) 3. Compare relative/evaluated path to configured routes (PathPrefix/pathRegexp)

Show details on source website