CVE-2023-28114 `cilium-cli` disables etcd authorization for clustermesh clusters
Attacker with valid etcd credentials can modify cluster state because cilium-cli incorrectly disables etcd authorization during cluster mesh setup.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-28114?
CVE-2023-28114 is a medium-severity missing authorization vulnerability in cilium-cli, published on 22 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
`cilium-cli` is the command line interface to install, manage, and troubleshoot Kubernetes clusters running Cilium. Prior to version 0.13.2,`cilium-cli`, when used to configure cluster mesh functionality, can remove the enforcement of user permissions on the `etcd` store used to mirror local cluster information to remote clusters. Users who have set up cluster meshes using the Cilium Helm chart are not affected by this issue.
Due to an incorrect mount point specification, the settings specified by the `initContainer` that configures `etcd` users and their permissions are overwritten when using `cilium-cli` to configure a cluster mesh. An attacker who has already gained access to a valid key and certificate for an `etcd` cluster compromised in this manner could then modify state in that `etcd` cluster.
This issue is patched in `cilium-cli` 0.13.2. As a workaround, one may use Cilium's Helm charts to create their cluster.
Which versions are affected by CVE-2023-28114?
3 open source packages ship an affected version, including github.com/cilium/cilium-cli. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cilium/cilium-cli Go | All versions | 0.13.2 |
github.com/cilium/cilium-cli Go | All versions | 0.13.2 |
github.com/cilium/cilium-cli Go | All versions | 0.13.2 |
Products include Cilium Cilium-Cli.
How do I fix CVE-2023-28114?
Upgrade github.com/cilium/cilium-cli to 0.13.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-28114 being exploited?
There is no known exploitation of CVE-2023-28114 in the wild and no public exploit code.
Sources
Also known as GHSA-6f27-3p6c-p5jc, GO-2023-1653.