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CVE-2020-8569— Kubernetes CSI snapshot-controller DoS

Quick assessment

Affected
Kubernetes CSI Snapshotter
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubernetes是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 Kubernetes CSI snapshot-controller prior to v2.1.3 and v3.0.2 存在代码问题漏洞，该漏洞禁止用户对其卷进行快照或删除快照。

CVSS 4.3 · Medium EPSS 2.27% · P83

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2020-8569

Vulnerability Information
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Vulnerability Title
Kubernetes CSI snapshot-controller DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 Kubernetes CSI snapshot-controller prior to v2.1.3 and v3.0.2 存在代码问题漏洞，该漏洞禁止用户对其卷进行快照或删除快照。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kubernetes CSI Snapshotter snapshot-controller v3.0 ~ v3.0.1 -

II. Public POCs for CVE-2020-8569

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III. Intelligence Information for CVE-2020-8569

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Other References for CVE-2020-8569 (1)

Other References for CVE-2020-8569 (1)

Same Patch Batch · Kubernetes · 2021-01-21 · 5 CVEs total

CVE-2020-8554 6.3 MEDIUM Kubernetes man in the middle using LoadBalancer or ExternalIPs
CVE-2020-8568 5.8 MEDIUM Kubernetes Secrets Store CSI Driver sync/rotate directory traversal
CVE-2020-8567 4.9 MEDIUM Kubernetes Secrets Store CSI Driver plugin directory traversals
CVE-2020-8570 Kubernetes Java client libraries unvalidated path traversal in Copy implementation

IV. Related Vulnerabilities

Same vendor: Kubernetes
Same weakness: CWE-476

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