Description
Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.
Problem types
CWE-208: Observable Timing Discrepancy
Product status
>= 3.0.0-beta1, < 3.6.11
>= 3.7.0-ea.1, < 3.7.0-ea.2
References
github.com/...raefik/security/advisories/GHSA-g3hg-j4jv-cwfr
github.com/traefik/traefik/releases/tag/v2.11.41
github.com/traefik/traefik/releases/tag/v3.6.11
github.com/traefik/traefik/releases/tag/v3.7.0-ea.2