CVE-2020-8567 : Vulnerability Insights and Analysis

Kubernetes Secrets Store CSI Driver plugin directory traversals

Understanding CVE-2020-8567

Kubernetes Secrets Store CSI Driver Vault Plugin prior to v0.0.6, Azure Plugin prior to v0.0.10, and GCP Plugin prior to v0.2.0 allow an attacker to write to arbitrary file paths on the host filesystem.

What is CVE-2020-8567?

This CVE refers to a vulnerability in the Kubernetes Secrets Store CSI Driver plugins that enables an attacker to manipulate SecretProviderClass objects to write to unauthorized file paths on the host system.

The Impact of CVE-2020-8567

CVSS Score: 4.9 (Medium Severity)
Attack Vector: Network
Attack Complexity: High
Integrity Impact: Low
Privileges Required: Low
Scope: Changed
The vulnerability allows attackers to write to sensitive file paths, compromising the integrity of the system.

Technical Details of CVE-2020-8567

The technical aspects of the vulnerability are as follows:

Vulnerability Description

The vulnerability allows an attacker to write to arbitrary file paths on the host filesystem, including critical directories like /var/lib/kubelet/pods.

Affected Systems and Versions

Kubernetes Secrets Store CSI Driver Vault Plugin < v0.0.6
Azure Plugin < v0.0.10
GCP Plugin < v0.2.0

Exploitation Mechanism

Attackers can exploit this vulnerability by creating specially-crafted SecretProviderClass objects.

Mitigation and Prevention

To address CVE-2020-8567, follow these steps:

Immediate Steps to Take

Update the affected plugins to versions that have patched the vulnerability.
Monitor file system activities for any suspicious behavior.

Long-Term Security Practices

Implement least privilege access controls to limit the impact of potential attacks.
Regularly audit and review access permissions to prevent unauthorized writes.

Patching and Updates

Apply security patches provided by Kubernetes for the affected plugins.