K8s Win Node Privilege Escalation via Pod & PVC in In-Tree Storage
CVE-2023-5528 Published on November 14, 2023
Kubernetes - Windows nodes - Insufficient input sanitization in in-tree storage plugin leads to privilege escalation
A security issue was discovered in Kubernetes where a user that can create pods and persistent volumes on Windows nodes may be able to escalate to admin privileges on those nodes. Kubernetes clusters are only affected if they are using an in-tree storage plugin for Windows nodes.
Vulnerability Analysis
CVE-2023-5528 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2023-5528. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2023-5528
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Affected Versions
Kubernetes kubelet:- Version v1.28.0, <= v1.28.3 is affected.
- Version v1.27.0, <= v1.27.7 is affected.
- Version v1.26.0, <= v1.26.10 is affected.
- Before and including v1.25.15 is affected.
- Version v1.28.4 is unaffected.
- Version v1.27.8 is unaffected.
- Version v1.26.11 is unaffected.
- Version v1.25.16 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.