CVE-2017-1002101 Explained : Impact and Mitigation

Kubernetes versions 1.3.x to 1.6.x and prior to 1.7.14, 1.8.9, and 1.9.4 allowed containers to access files outside their assigned volumes, posing a security risk.

Understanding CVE-2017-1002101

This CVE highlights a vulnerability in Kubernetes that could allow containers to access files or directories beyond their designated volumes.

What is CVE-2017-1002101?

Before versions 1.7.14, 1.8.9, and 1.9.4, Kubernetes versions 1.3.x to 1.6.x permitted containers to access files outside their assigned volumes, including the host's filesystem.

The Impact of CVE-2017-1002101

The vulnerability had a CVSS base score of 8.8 (High severity) with significant impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2017-1002101

This section delves into the specifics of the vulnerability.

Vulnerability Description

Kubernetes versions 1.3.x to 1.6.x and earlier allowed containers to access files outside their assigned volumes, irrespective of volume type, potentially compromising system security.

Affected Systems and Versions

Affected versions: 1.3.x, 1.4.x, 1.5.x, 1.6.x, < 1.7.14, < 1.8.9, < 1.9.4
Product: Kubernetes

Exploitation Mechanism

Containers using subpath volume mounts with any volume type could access files/directories outside the assigned volume, including the host's filesystem.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Kubernetes to versions 1.7.14, 1.8.9, or 1.9.4 or newer to mitigate the issue.
Implement strict file permissions and access controls for containers.

Long-Term Security Practices

Regularly update Kubernetes to the latest stable releases to address security flaws.
Conduct security audits and penetration testing to identify and remediate vulnerabilities.

Patching and Updates

Apply security patches promptly to ensure the latest fixes are in place.