Traefik may display authorization header in the debug logs

Open Source Vulnerabilities CVE-2022-23469

Traefik is an open source HTTP reverse proxy and load balancer. Versions prior to 2.9.6 are subject to a potential vulnerability in Traefik displaying the Authorization header in its debug logs. In certain cases, if the log level is set to DEBUG, credentials provided using the Authorization header are displayed in the debug logs. Attackers must have access to a users logging system in order for credentials to be stolen. This issue has been addressed in version 2.9.6. Users are advised to upgrade. Users unable to upgrade may set the log level to `INFO`, `WARN`, or `ERROR`.

Open Source Vulnerabilities GO-2022-1154

Traefik may display authorization header in the debug logs in github.com/traefik/traefik

Open Source Vulnerabilities GHSA-h2ph-vhm7-g4hp

### Impact There is a potential vulnerability in Traefik displaying the Authorization header in its debug logs. Traefik uses [oxy](https://github.com/vulcand/oxy) to provide the following features: - Round Robin: https://doc.traefik.io/traefik/routing/services/#weighted-round-robin-service - Buffering: https://doc.traefik.io/traefik/middlewares/http/buffering/ - Circuit Breaker: https://doc.traefik.io/traefik/middlewares/http/circuitbreaker/ - In-Flight Requests: https://doc.traefik.io/traefik/middlewares/http/inflightreq/ In such cases, if the log level is set to DEBUG, the credentials provided using the Authorization header are displayed in the debug logs: ``` level=debug msg="vulcand/oxy/roundrobin/rr: completed ServeHttp on request" Request="{\\"Method\\":\\"POST\\",\\"URL\\":{\\"Scheme\\":\\"\\",\\"Opaque\\":\\"\\",\\"User\\":null,\\"Host\\":\\"\\",\\"Path\\":\\"/<redacted>/<redacted>\\",\\"RawPath\\":\\"\\",\\"ForceQuery\\":false,\\"RawQuery\\":\\"\\",\\"Fragment\\":\\"\\",\\"RawFragment\\":\\"\\"},\\"Proto\\":\\"HTTP/2.0\\",\\"ProtoMajor\\":2,\\"ProtoMinor\\":0,\\"Header\\":{\\"Authorization\\":[\\"Bearer <token value was here>\\"],\\"Content-Type\\":[\\"application/grpc\\"],\\"Grpc-Accept-Encoding\\":[\\"gzip\\"],\\"Grpc-Timeout\\":[\\"29999886u\\"],\\"Te\\":[\\"trailers\\"],\\"User-Agent\\":[\\"<redacted>\\"],<remainder of log message removed> ``` ### Patches https://github.com/traefik/traefik/pull/9574 https://github.com/traefik/traefik/releases/tag/v2.9.6 ### Workarounds Set the log level to `INFO`, `WARN`, or `ERROR`. ### For more information If you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).