CVE-2020-8570 : What You Need to Know

Kubernetes Java client libraries in version 10.0.0 and versions prior to 9.0.1 allow writes to paths outside of the current directory when copying multiple files from a remote pod, potentially overwriting system files.

Understanding CVE-2020-8570

This CVE involves unvalidated path traversal in the Copy implementation of Kubernetes Java client libraries.

What is CVE-2020-8570?

Kubernetes Java client libraries versions prior to 9.0.1 and version 10.0.0 allow unauthorized writes to directories outside the intended path, posing a risk of system file corruption.

The Impact of CVE-2020-8570

The vulnerability enables an attacker to overwrite critical system files, leading to potential system compromise and unauthorized access.

Technical Details of CVE-2020-8570

Kubernetes Java client libraries are susceptible to unauthorized path traversal during file copying operations.

Vulnerability Description

The issue allows an attacker to write to paths outside the current directory when copying files from a remote pod, potentially leading to system file overwrites.

Affected Systems and Versions

Affected versions: all versions prior to 9.0, version 9.0, and version 10.0

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a maliciously crafted archive to copy multiple files from a remote pod, enabling unauthorized writes to system directories.

Mitigation and Prevention

To address CVE-2020-8570, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Upgrade to versions 9.0.2, 10.0.1, or 11.0.0 of the Kubernetes Java client library

Long-Term Security Practices

Regularly monitor and update software dependencies
Implement secure coding practices to prevent path traversal vulnerabilities

Patching and Updates

Ensure timely application of security patches and updates to mitigate the risk of unauthorized file writes.