CVE-2018-1002100 : What You Need to Know

A security vulnerability in the kubectl cp command in Kubernetes versions 1.5.x to 1.8.x and earlier than 1.9.6 could lead to the unintentional overwriting of local files.

Understanding CVE-2018-1002100

This CVE involves a directory traversal vulnerability in Kubernetes affecting specific versions.

What is CVE-2018-1002100?

The vulnerability in the kubectl cp command of Kubernetes versions 1.5.x to 1.8.x and less than 1.9.6 could allow malicious actors to overwrite local files unintentionally.

The Impact of CVE-2018-1002100

The vulnerability poses a medium severity risk with a CVSS base score of 4.2. It requires high privileges and user interaction, potentially leading to the compromise of file integrity.

Technical Details of CVE-2018-1002100

The technical aspects of the vulnerability in Kubernetes.

Vulnerability Description

The kubectl cp command insecurely handles tar data from containers, enabling the overwriting of arbitrary local files.

Affected Systems and Versions

Kubernetes versions 1.5.x, 1.6.x, 1.7.x, 1.8.x
Versions prior to 1.9.6

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Network
Privileges Required: High
User Interaction: Required
Integrity Impact: High

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2018-1002100.

Immediate Steps to Take

Upgrade Kubernetes to a version equal to or greater than 1.9.6
Monitor and restrict access to the kubectl cp command
Implement network segmentation to limit exposure

Long-Term Security Practices

Regularly update Kubernetes to the latest stable version
Conduct security audits and penetration testing
Educate users on secure container handling practices

Patching and Updates

Apply patches provided by Kubernetes for the specific vulnerability
Stay informed about security advisories and updates from Kubernetes