GHSA-6qq8-5wq3-86rp Traefik vulnerable to Open Redirect via handling of X-Forwarded-Prefix header

• Go github.com/traefik/traefik: >= 1.5.0-rc5, < 1.7.26 → fixed in 1.7.26 • Go github.com/traefik/traefik/v2: < 2.3.0-rc6 → fixed in 2.3.0-rc6 • Go github.com/containous/traefik: >= 1.5.0-rc5, < 1.7.26 → fixed in 1.7.26 • Go github.com/containous/traefik/v2: < 2.2.8 → fixed in 2.2.8 • Go github.com/traefik/traefik/v2: >= 2.3.0-rc1, < 2.3.0-rc6 → fixed in 2.3.0-rc6 • Go github.com/containous/traefik/v2: >= 2.3.0-rc1, < 2.3.0-rc3 → fixed in 2.3.0-rc3 • Go github.com/traefik/traefik/api: >= 1.5.0-rc5, < 1.7.26 → fixed in 1.7.26 • Go github.com/traefik/traefik/v2/pkg/api: < 2.3.0-rc6 → fixed in 2.3.0-rc6 • Go github.com/traefik/traefik/v2/pkg/api: >= 2.3.0-rc1, < 2.3.0-rc6 → fixed in 2.3.0-rc6 • Go github.com/containous/traefik/api: >= 1.5.0-rc5, < 1.7.26 → fixed in 1.7.26 • Go github.com/containous/traefik/v2/pkg/api: < 2.2.8 → fixed in 2.2.8 • Go github.com/containous/traefik/v2/pkg/api: >= 2.3.0-rc1, < 2.3.0-rc3 → fixed in 2.3.0-rc3

Summary There exists a potential open redirect vulnerability in Traefik's handling of the `X-Forwarded-Prefix` header. Active Exploitation of this issue is unlikely as it would require active header injection, however the Traefik team addressed this issue nonetheless to prevent abuse in e.g. cache poisoning scenarios. Details The Traefik API dashboard component doesn't validate that the value of the header `X-Forwarded-Prefix` is a site relative path and will redirect to any header provided URI. e.g. ``` $ curl --header 'Host:traefik.localhost' --header 'X-Forwarded-Prefix:https://example.org' 'http://localhost:8081' Found.` ``` Impact A successful exploitation of an open redirect can be used to entice victims to disclose sensitive information. Workarounds By using the `headers` middleware, the request header `X-Forwarded-Prefix` value can be overridden by the value `.` (dot) • https://docs.traefik.io/v2.2/middlewares/headers/#customrequestheaders • https://docs.traefik.io/v1.7/basics/#custom-headers For more information If you have any questions or comments about this advisory, open an issue in Traefik. Credit This issue was found by the GitHub Application Security Team and reported on behalf of the GHAS by the GitHub Security Lab Team.