CVE-2018-1002105 : What You Need to Know

A critical vulnerability in Kubernetes versions prior to v1.10.11, v1.11.5, and v1.12.3 allowed unauthorized connections to backend servers through the API server.

Understanding CVE-2018-1002105

This CVE highlights a flaw in how the kube-apiserver handled error responses, enabling unauthorized access to backend servers through Kubernetes.

What is CVE-2018-1002105?

Prior to specific versions of Kubernetes, a vulnerability allowed specially crafted requests to establish unauthorized connections to backend servers through the API server.

The Impact of CVE-2018-1002105

The vulnerability had a critical severity level with high impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2018-1002105

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw in kube-apiserver allowed unauthorized connections to backend servers through Kubernetes, enabling the sending of arbitrary requests.

Affected Systems and Versions

Affected versions: v1.0.x to v1.9.x, less than v1.10.11, v1.11.5, and v1.12.3
Product: Kubernetes

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Scope: Unchanged
Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and Prevention

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

Immediate Steps to Take

Update Kubernetes to versions v1.10.11, v1.11.5, or v1.12.3
Monitor and restrict network access to the API server
Implement strong authentication mechanisms

Long-Term Security Practices

Regularly update Kubernetes and apply security patches
Conduct security audits and penetration testing
Educate staff on secure coding practices

Patching and Updates

Apply the latest patches provided by Kubernetes
Stay informed about security advisories and updates