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GHSA-468w-8x39-gj5v
No affected components available
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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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