CVE-2022-23632: Skip the router TLS configuration when the host header is an FQDN in github.com/traefik/traefik
Summary
CVE-2022-23632: Skip the router TLS configuration when the host header is an FQDN in github.com/traefik/traefik. Affected versions are not published. No fix is published. How to fix ↓
Also tracked for
The same CVE-2022-23632 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
Traefik is an open-source reverse proxy and load balancer that helps in routing HTTP and TCP traffic. It is written in Go and is widely used in various applications and systems. This vulnerability affects the Traefik package, specifically versions 0 and 2.6.0. Traefik allows users to configure TLS (Transport Layer Security) for secure communication. However, when the host header is a fully qualified domain name (FQDN), the router TLS configuration is skipped, leading to potential security risks.
Vulnerability Detail
The vulnerability arises from the improper handling of TLS configuration in Traefik when the host header is an FQDN. This means that when a request is made with an FQDN as the host header, the router TLS configuration is not applied, leaving the communication unencrypted. Attackers can exploit this vulnerability to intercept and manipulate sensitive data transmitted between the client and the server. This can result in unauthorized access, data leakage, and potential compromise of the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can modify their Traefik configuration to explicitly include the TLS configuration for routers, even when the host header is an FQDN. This can be achieved by adding the necessary TLS configuration directives in the Traefik configuration file. Here is an example of how to configure TLS for routers in Traefik:
http:
routers:
my-router:
rule: Host(`example.com`)
tls:
certResolver: default
options: Strict
minVersion: VersionTLS12
cipherSuites:
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
Conclusion
The vulnerability in Traefik allows attackers to bypass TLS configuration when the host header is an FQDN, potentially compromising the security of the system. It is crucial to update to the latest version of Traefik (2.6.1 or above) to mitigate this vulnerability and ensure secure communication.
See every vulnerability recorded for github.com/traefik/traefik →
FAQ
Traefik is an open-source reverse proxy and load balancer written in Go. It is used to route HTTP and TCP traffic in various applications and systems.
TLS (Transport Layer Security) is a cryptographic protocol used to secure communication over a network. It ensures that data transmitted between the client and the server is encrypted and protected from unauthorized access.
This vulnerability allows attackers to intercept and manipulate sensitive data transmitted between the client and the server. It can lead to unauthorized access, data leakage, and potential compromise of the system.
Versions 0 and 2.6.0 of the Traefik package are affected by this vulnerability.
To fix this vulnerability, it is recommended to update the Traefik package to version 2.6.1 or above.
Related vulnerabilities
Recent vulnerabilities recorded for github.com/traefik/traefik.
