etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| go.etcd.io/etcd/v3(Go) | 3.2.0 | 3.2.26 | N/A |
| go.etcd.io/etcd/v3(Go) | 3.3.0 | 3.3.11 | N/A |
| go.etcd.io/etcd(Go) | 0 | 0.5.0-alpha.5.0.20190108173120-83c051b701d3 | N/A |
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