Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2.11.43CPE matchmatch criteria | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | ||
>= 3.0.0, < 3.6.14CPE matchmatch criteria | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | ||
3.7.0CPE matchmatch criteria | cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:* | ||
3.7.0CPE matchmatch criteria | cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:* | ||
3.7.0CPE matchmatch criteria | cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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