CVE-2020-8569 Kubernetes CSI snapshot-controller DoS
Attackers can cause a crashloop in the Kubernetes CSI snapshot-controller by submitting specific VolumeSnapshot resources, preventing volume snapshot operations.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8569?
CVE-2020-8569 is a medium-severity vulnerability in Kubernetes CSI Snapshotter, published on 21 Jan 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kubernetes CSI snapshot-controller prior to v2.1.3 and v3.0.2 could panic when processing a VolumeSnapshot custom resource when: - The VolumeSnapshot referenced a non-existing PersistentVolumeClaim and the VolumeSnapshot did not reference any VolumeSnapshotClass. - The snapshot-controller crashes, is automatically restarted by Kubernetes, and processes the same VolumeSnapshot custom resource after the restart, entering an endless crashloop. Only the volume snapshot feature is affected by this vulnerability. When exploited, users can’t take snapshots of their volumes or delete the snapshots. All other Kubernetes functionality is not affected.
Weakness: CWE-476
Which versions are affected by CVE-2020-8569?
4 open source packages ship an affected version, including github.com/kubernetes-csi/external-snapshotter/v2 and github.com/kubernetes-csi/external-snapshotter/v3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/kubernetes-csi/external-snapshotter/v2 Go | From 2.0.0 | 2.1.3 |
github.com/kubernetes-csi/external-snapshotter/v2 Go | From 2.0.0 | 2.1.3 |
github.com/kubernetes-csi/external-snapshotter/v3 Go | From 3.0.0 | 3.0.2 |
github.com/kubernetes-csi/external-snapshotter/v3 Go | From 3.0.0 | 3.0.2 |
Products include Kubernetes Container Storage Interface Snapshotter.
How do I fix CVE-2020-8569?
Upgrade github.com/kubernetes-csi/external-snapshotter/v2 to 2.1.3 or later.
Is CVE-2020-8569 being exploited?
There is no known exploitation of CVE-2020-8569 in the wild and no public exploit code.
Sources
Also known as GHSA-hwrr-rhmm-vcvf.