CVE-2024-6156: lxd CA certificate sign check bypass
(updated )
If a server.ca file is present in LXD_DIR at LXD start up, LXD is in “PKI mode”. In this mode, only TLS clients that have a CA-signed certificate should be able to authenticate with LXD.
We have discovered that if a client that sends a non-CA signed certificate during the TLS handshake, that client is able to authenticate with LXD if their certificate is present in the trust store.
- The LXD Go client (and by extension
lxc) does not send non-CA signed certificates during the handshake. - A manual client (e.g.
cURL) might send a non-CA signed certificate during the handshake.
References
- github.com/advisories/GHSA-4c49-9fpc-hc3v
- github.com/canonical/lxd
- github.com/canonical/lxd/commit/92468bb60f4f1edf38ff0434414bea4f28afa711
- github.com/canonical/lxd/security/advisories/GHSA-4c49-9fpc-hc3v
- nvd.nist.gov/vuln/detail/CVE-2024-6156
- pkg.go.dev/vuln/GO-2024-3312
- www.cve.org/CVERecord?id=CVE-2024-6156
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