CVE-2020-8569 Kubernetes CSI snapshot-controller DoS

2021-01-2117:09:21

CWE-476

kubernetes

www.cve.org

kubernetes csi snapshot-controller

dos

volumesnapshot custom resource

vulnerability

crashloop

CVSS3

4.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS

0.001

Percentile

29.2%

JSON

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.

CNA Affected

[
  {
    "product": "CSI Snapshotter",
    "vendor": "Kubernetes",
    "versions": [
      {
        "lessThanOrEqual": "v3.0.1",
        "status": "affected",
        "version": "snapshot-controller v3.0",
        "versionType": "custom"
      },
      {
        "lessThanOrEqual": "v2.1.2",
        "status": "affected",
        "version": "snapshot-controller v2.1",
        "versionType": "custom"
      }
    ]
  }
]