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Check your Helm chart for vulnerabilities

CircleCI

The Helm plugin for Snyk provides a subcommand for testing the images in a given Helm chart for known vulnerabilities.

Installation

Install the plugin using the built-in helm plugin command:

helm plugin install https://github.com/snyk-labs/helm-snyk

The plugin connects to the Snyk service to lookup vulnerability information. If you don't have a Snyk account, go to snyk.io/login to sign up for free. You can then obtain an access token from app.snyk.io/account or for information on using service accounts, see snyk.io/docs/service-accounts/.

Once you have an account, you should set the SNYK_TOKEN environment variable:

export SNYK_TOKEN=<your-snyk-token>

The plugin also requires a local Docker installation and uses this to download and test each of the images discovered in the chart.

Usage

With the plugin installed, simply run the new helm snyk test command and point it to the directory of the chart. For instance:

$ helm snyk test stable/redis
Image: docker.io/bitnami/redis:5.0.5-debian-9-r181
Testing docker.io/bitnami/redis:5.0.5-debian-9-r181...
✗ Low severity vulnerability found in tar
  Description: CVE-2005-2541
  Info: https://snyk.io/vuln/SNYK-LINUX-TAR-105079
  Introduced through: meta-common-packages@meta
  From: meta-common-packages@meta > tar@1.29b-1.1
✗ Low severity vulnerability found in systemd/libsystemd0
  Description: CVE-2019-9619
  Info: https://snyk.io/vuln/SNYK-LINUX-SYSTEMD-442642
  Introduced through: systemd/libsystemd0@232-25+deb9u12, util-linux/bsdutils@1:2.29.2-1+deb9u1, procps@2:3.3.12-3+deb9u1, sysvinit/sysvinit-utils@2.88dsf-59.9, systemd/libudev1@232-25+deb9u12, util-linux/mount@2.29.2-1+deb9u1
  From: systemd/libsystemd0@232-25+deb9u12
  From: util-linux/bsdutils@1:2.29.2-1+deb9u1 > systemd/libsystemd0@232-25+deb9u12
  From: procps@2:3.3.12-3+deb9u1 > procps/libprocps6@2:3.3.12-3+deb9u1 > systemd/libsystemd0@232-25+deb9u12
  and 4 more...
...

The plugin also supports the various arguments for modifying the chart, including --set and --values. So for instance you can test the same chart but override the image tag like so:

helm snyk test --set image.tag=latest

As well as the user-friendly output above the plugin also supports outputting the results as a JSON document. This can be useful for further analysis or integration with other tooling.

$ helm snyk test stable/mysql --json
{
  "helmChart": "mysql@1.3.0",
  "images": [
    {
      "imageName": "dduportal/bats:0.4.0",
      "results": {
        "vulnerabilities": [
          {
            "CVSSv3": null,
            "creationTime": "2019-02-06T14:40:43.295348Z",
            "credit": [
              ""
            ],
            "cvssScore": null,
            "description": "## Overview\nCVE-2011-3374",
            "disclosureTime": null,
            "id": "SNYK-LINUX-APT-116518",
            "identifiers": {
              "ALTERNATIVE": [
                "SNYK-DEBIAN8-APT-407500",
...

For further options and features see the help instructions with the --help flag.