Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce.
This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
traefik:traefik
References 5
https://github.com/traefik/traefik/commit/65ebf4b47fbdc33e3856803a5844a404e094d…
security-advisories@github.com
https://github.com/traefik/traefik/releases/tag/v2.11.54
security-advisories@github.com
https://github.com/traefik/traefik/releases/tag/v3.6.25
security-advisories@github.com
https://github.com/traefik/traefik/releases/tag/v3.7.10
security-advisories@github.com
https://github.com/traefik/traefik/security/advisories/GHSA-62fc-8686-hfmq
security-advisories@github.com