CVE-2020-15186 Explained : Impact and Mitigation

Helm before versions 2.16.11 and 3.3.2 has an issue where plugin names are not properly sanitized, potentially allowing malicious plugin authors to manipulate plugin names and cause unexpected behavior.

Understanding CVE-2020-15186

Inadequate sanitization of plugin names in Helm could lead to security vulnerabilities and unexpected outcomes.

What is CVE-2020-15186?

This CVE pertains to the improper sanitization of plugin names in Helm versions prior to 2.16.11 and 3.3.2, enabling malicious actors to exploit plugin names for unauthorized actions.

The Impact of CVE-2020-15186

The vulnerability has a CVSS base score of 3.4 (Low severity) and requires user interaction for exploitation. It could result in unexpected behavior and potential security risks.

Technical Details of CVE-2020-15186

Helm's vulnerability stems from improper input validation in plugin names, allowing for unauthorized actions.

Vulnerability Description

The issue arises from the lack of proper sanitization of plugin names, enabling malicious plugin authors to manipulate names and potentially spoof outputs.

Affected Systems and Versions

Helm versions >= 2.0.0, < 2.16.11
Helm versions >= 3.0.0, < 3.3.2

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Network
Scope: Changed
Privileges Required: None
User Interaction: Required

Mitigation and Prevention

To address CVE-2020-15186, follow these steps:

Immediate Steps to Take

Update Helm to version 3.3.2 or later to patch the vulnerability.
Avoid installing untrusted Helm plugins.
Review the

name

field in the

plugin.yaml

file for suspicious characters.

Long-Term Security Practices

Regularly update Helm and its plugins to the latest versions.
Implement strict plugin validation processes to prevent unauthorized actions.

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the risk of exploitation.