Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 3.6.11, 3.7.0-ea.2
- 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 HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster validation, Knative `rules[].hosts[]` was exploitable for host restriction bypass (for example `tenant.example.com`) || Host(`attacker.com`), producing a router that serves attacker-controlled hosts. Knative `headers[].exact` also allows rule-syntax injection and proves unsafe rule construction. In multi-tenant clusters, this can route unauthorized traffic to victim services and lead to cross-tenant traffic exposure. Versions 3.6.11 and 3.7.0-ea.2 patch the issue.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- traefik traefik
fixed in 3.6.11; From 3.7.0-ea.1 · fixed in 3.7.0-ea.2
- github.com/traefik/traefik/v3Go
fixed in 3.6.11
- github.com/traefik/traefik/v3Go
From 3.7.0-ea.1 · fixed in 3.7.0-ea.2
- github.com/traefik/traefik/v2Go
through 2.11.42
- github.com/traefik/traefikGo
All versions
- github.com/traefik/traefik/v2Go
All versions
- github.com/traefik/traefik/v3Go
fixed in 3.6.11; From 3.7.0-ea.1 · fixed in 3.7.0-ea.2