CVE-2020-8569

Public Exploit
Kubernetes CSI snapshot-controller DoS

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.

Remediation

Workaround:

  • Prior to upgrading, this vulnerability can be mitigated by restricting creation of VolumeSnapshot custom resources in API group snapshot.storage.k8s.io only to trusted users.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.35%
Third-Party Advisory github.com Third-Party Advisory google.com
Affected: Kubernetes CSI Snapshotter
Published at:
Updated at:

References

Link Tags
https://groups.google.com/g/kubernetes-security-announce/c/1EzCr1qUxxU third party advisory mailing list
https://github.com/kubernetes-csi/external-snapshotter/issues/380 third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2020-8569?
CVE-2020-8569 has been scored as a medium severity vulnerability.
How to fix CVE-2020-8569?
As a workaround for remediating CVE-2020-8569: Prior to upgrading, this vulnerability can be mitigated by restricting creation of VolumeSnapshot custom resources in API group snapshot.storage.k8s.io only to trusted users.
Is CVE-2020-8569 being actively exploited in the wild?
It is possible that CVE-2020-8569 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-8569?
CVE-2020-8569 affects Kubernetes CSI Snapshotter.
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