Vulnerability · Published Jan 21, 2021 · Assigned by kubernetes

CVE-2020-8569Kubernetes CSI snapshot-controller DoS

Medium 4.3

In plain English

A medium-severity null pointer dereference in CSI Snapshotter from Kubernetes. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)2.2%top 17.3% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/kubernetes-csi/external-snapshotter/v2	2.1.3	GHSA-hwrr-rhmm-vcvf
Go	github.com/kubernetes-csi/external-snapshotter/v3	3.0.2	GHSA-hwrr-rhmm-vcvf

Affected products (as reported)

Vendor	Product	Versions
Kubernetes	CSI Snapshotter	snapshot-controller v3.0 – through v3.0.1snapshot-controller v2.1 – through v2.1.2

Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References

https://groups.google.com/g/kubernetes-security-announce/c/1EzCr1qUxxU x_refsource_MISC
https://github.com/kubernetes-csi/external-snapshotter/issues/380 x_refsource_MISC