Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted header name in an HTTP/1.1 chunked trailer or an HTTP/2 trailer. When the retry or buffering middleware reads the body before the reverse proxy clones the request, the attacker-controlled trailer value reaches a backend that merges trailers into the header namespace, bypassing the documented delete or reject behavior and potentially spoofing identity or forwarded routing data.
This issue is fixed in 3.7.13.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Traefik Traefik
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
|
3.2.0
|
3.7.13
|
References 4
https://github.com/traefik/traefik/commit/55bbda4f65e0f9c533c870983a767a7081126…
security-advisories@github.com
https://github.com/traefik/traefik/pull/13822
security-advisories@github.com
https://github.com/traefik/traefik/releases/tag/v3.7.13
security-advisories@github.com
https://github.com/traefik/traefik/security/advisories/GHSA-v67p-phpq-fc8x
security-advisories@github.com