GHSA-468w-8x39-gj5v Traefik routes exposed with an empty TLSOption

• Go github.com/traefik/traefik/v2: < 2.9.6 → fixed in 2.9.6

Impact There is a potential vulnerability in Traefik managing the TLS connections. A router configured with a not well-formatted TLSOption is exposed with an empty TLSOption. For instance, a route secured using an mTLS connection set with a wrong CA file is exposed without verifying the client certificates. Patches https://github.com/traefik/traefik/releases/tag/v2.9.6 Workarounds Check the logs to detect the following error messages and fix your TLS options: • Empty CA: ``` {"level":"error","msg":"invalid clientAuthType: RequireAndVerifyClientCert, CAFiles is required","routerName":"Router0@file"} ``` • Bad CA content (or bad path): ``` {"level":"error","msg":"invalid certificate(s) content","routerName":"Router0@file"} ``` • Unknown Client Auth Type: ``` {"level":"error","msg":"unknown client auth type \"FooClientAuthType\"","routerName":"Router0@file"} ``` • Invalid cipherSuites ``` {"level":"error","msg":"invalid CipherSuite: foobar","routerName":"Router0@file"} ``` • Invalid curvePreferences ``` {"level":"error","msg":"invalid CurveID in curvePreferences: foobar","routerName":"Router0@file"} ``` For more information If you have any questions or comments about this advisory, please open an issue.