Описание
Traefik has a possible vulnerability with its path matchers
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 /../ in its path, it’s possible to target a backend, exposed using another router, by-passing the middlewares chain.
Example
In such a case, the request http://mydomain.example.com/service/sub-path/../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/v2.11.24
- https://github.com/traefik/traefik/releases/tag/v3.3.6
- https://github.com/traefik/traefik/releases/tag/v3.4.0-rc2
Workaround
Add a PathRegexp rule to the matcher to prevent matching a route with a /../ in the path.
Example:
For more information
If you have any questions or comments about this advisory, please open an issue.
Ссылки
- https://github.com/traefik/traefik/security/advisories/GHSA-6p68-w45g-48j7
- https://nvd.nist.gov/vuln/detail/CVE-2025-32431
- https://github.com/traefik/traefik/pull/11684
- https://github.com/traefik/traefik/releases/tag/v2.11.24
- https://github.com/traefik/traefik/releases/tag/v3.3.6
- https://github.com/traefik/traefik/releases/tag/v3.4.0-rc2
Пакеты
github.com/traefik/traefik
<= 1.7.34
Отсутствует
github.com/traefik/traefik/v2
< 2.11.23
2.11.23
github.com/traefik/traefik/v3
< 3.3.6
3.3.6
github.com/traefik/traefik/v3
= 3.4.0-rc1
3.4.0-rc2
Связанные уязвимости
Traefik (pronounced traffic) is an HTTP reverse proxy and load balancer. In versions prior to 2.11.24, 3.3.6, and 3.4.0-rc2. 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 /../ in its path, it’s possible to target a backend, exposed using another router, by-passing the middlewares chain. This issue has been patched in versions 2.11.24, 3.3.6, and 3.4.0-rc2. A workaround involves adding a `PathRegexp` rule to the matcher to prevent matching a route with a `/../` in the path.
Traefik (pronounced traffic) is an HTTP reverse proxy and load balance ...
Уязвимость обратного прокси сервера Containous Traefik, связанная с неверным ограничением имени пути к каталогу с ограниченным доступом, позволяющая нарушителю раскрыть защищаемую информацию