CVE-2022-23632: Traefik skips the router TLS configuration when the host header is an FQDN
First published: Thu Feb 17 2022(Updated: )
Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.6.1, Traefik skips the router transport layer security (TLS) configuration when the host header is a fully qualified domain name (FQDN). For a request, the TLS configuration choice can be different than the router choice, which implies the use of a wrong TLS configuration. When sending a request using FQDN handled by a router configured with a dedicated TLS configuration, the TLS configuration falls back to the default configuration that might not correspond to the configured one. If the CNAME flattening is enabled, the selected TLS configuration is the SNI one and the routing uses the CNAME value, so this can skip the expected TLS configuration. Version 2.6.1 contains a patch for this issue. As a workaround, one may add the FDQN to the host rule. However, there is no workaround if the CNAME flattening is enabled.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Traefik Traefik | <2.6.1 | |
| Oracle Communications Unified Inventory Management | =7.5.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-23632?
CVE-2022-23632 is a vulnerability in Traefik, an HTTP reverse proxy and load balancer, that allows the TLS configuration to be skipped when the host header is a fully qualified domain name (FQDN).
How does CVE-2022-23632 affect Traefik?
CVE-2022-23632 affects Traefik versions prior to 2.6.1 and can result in the skipping of router transport layer security (TLS) configuration.
What is the severity of CVE-2022-23632?
The severity of CVE-2022-23632 is rated as high with a severity value of 7.5.
Which software versions are affected by CVE-2022-23632?
Traefik versions prior to 2.6.1 and Oracle Communications Unified Inventory Management version 7.5.0 are affected by CVE-2022-23632.
How can I fix CVE-2022-23632?
To fix CVE-2022-23632, it is recommended to update Traefik to version 2.6.1 or later.
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