[github.com/traefik/traefik] Improper Certificate Handling

configurationwatcher.go in Traefik 2.x before 2.1.4 and TraefikEE 2.0.0 mishandles the purging of certificate contents from providers before logging.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-9321
• https://github.com/traefik/traefik/pull/6281
• https://github.com/traefik/traefik/releases/tag/v2.1.4
• https://github.com/advisories/GHSA-7h6j-2268-fhcm