Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 2.11.54, 3.6.25, 3.7.10
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- traefik traefik
fixed in 2.11.54; From 3.0.0 · fixed in 3.6.25; From 3.7.0 · fixed in 3.7.10
- github.com/traefik/traefikGo
All versions
- github.com/traefik/traefik/v2Go
fixed in 2.11.54
- github.com/traefik/traefik/v3Go
From 3.0.0 · fixed in 3.6.25; From 3.7.0 · fixed in 3.7.10
- github.com/traefik/traefik/v3Go
From 3.0.0 · fixed in 3.6.25
- github.com/traefik/traefik/v3Go
From 3.7.0 · fixed in 3.7.10
- github.com/traefik/traefikGo
through 1.7.34