CVE-2019-18658 : Security Advisory and Response

Helm 2.x before version 2.15.2 had a vulnerability that could allow an attacker to include sensitive files or execute a denial of service attack through the use of symlinks.

Understanding CVE-2019-18658

This CVE relates to a security issue in Helm 2.x versions prior to 2.15.2 that could be exploited by maliciously designed charts.

What is CVE-2019-18658?

Prior to version 2.15.2, Helm 2.x had a vulnerability in commands related to loading a chart as a directory or packaging a chart. This vulnerability allowed an attacker to potentially include sensitive files (e.g., /etc/passwd) or execute a denial of service attack (DoS) using special files like /dev/urandom through the use of symlinks. It is important to note that this vulnerability only affects the client and not the Tiller component.

The Impact of CVE-2019-18658

Attackers could exploit this vulnerability to include sensitive content or execute DoS attacks through specially crafted symlinks.

Technical Details of CVE-2019-18658

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

Commands in Helm 2.x before 2.15.2 that handle loading a chart as a directory or packaging a chart could be manipulated by a malicious chart to include sensitive data or trigger a DoS attack using symlinks.

Affected Systems and Versions

Helm 2.x versions before 2.15.2 are impacted by this vulnerability.

Exploitation Mechanism

Attackers could exploit this vulnerability by crafting malicious charts that leverage symlinks to access sensitive files or trigger DoS attacks.

Mitigation and Prevention

Protecting systems from CVE-2019-18658 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Upgrade to Helm 2.x version 2.15.2 or later to mitigate the vulnerability.

Long-Term Security Practices

Regularly update Helm and other software components to patch known vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches and updates to ensure system security.