docker scan to scan for vulnerabilities. It's a best practice to pass the
Dockerfile used to build the image with
--file to get more robust results that include vulnerabilities from Dockerfile instruction and base image upgrade guidance.
# Scan the docker-goof image and passing the Dockerfiledocker scan $DockerId/docker-goof --file=Dockerfile
When finished, results are displayed in the Terminal, along with remediation guidance.
Vulnerabilities are broken up into sections, based on how they were introduced:
Vulnerabilities introduced by the container's base image can be identified by the presence of the
Introduced by your base image line. (Line 9 below)
✗ High severity vulnerability found in curl/libcurl3Description: Buffer OverflowInfo: https://snyk.io/vuln/SNYK-DEBIAN8-CURL-466507Introduced through: firstname.lastname@example.org+deb8u11, email@example.com+deb8u11, git@1:2.1.4-2.1+deb8u6From: firstname.lastname@example.org+deb8u11 > email@example.com+deb8u11From: firstname.lastname@example.org+deb8u11 > email@example.com+deb8u11From: firstname.lastname@example.org+deb8u11and 2 more...Introduced by your base image (node:10.4.0)Fixed in: 7.38.0-4+deb8u16
Some vulnerabilities are introduced by User Instruction in the Dockerfile. Snyk highlights the command that introduced the vulnerability, with the
Introduced in your Dockerfile by line. (Line 9)
✗ High severity vulnerability found in bzip2/bzip2Description: Out-of-bounds WriteInfo: https://snyk.io/vuln/SNYK-DEBIAN8-BZIP2-450781Introduced through: email@example.com+b3, firstname.lastname@example.org, email@example.com+b3, imagemagick/libmagickcore-dev@8:22.214.171.124-5+deb8u12, meta-common-packages@metaFrom: firstname.lastname@example.org+b3From: email@example.com > firstname.lastname@example.org+b3From: email@example.com+b3and 2 more...Introduced in your Dockerfile by 'RUN apt-get install -y imagemagick'Fixed in: 1.0.6-7+deb8u1
The last kind of vulnerability your images might contain are introduced by your application dependencies. Snyk highlights the package manifest
Target File that introduced it. (Line 14)
Issues to fix by upgrading:Upgrade @firstname.lastname@example.org to @email@example.com to fix✗ Remote Code Execution (RCE) [Medium Severity][https://snyk.io/vuln/SNYK-JS-BUNYAN-573166] in firstname.lastname@example.org by email@example.com > firstname.lastname@example.org and 8 other path(s)Upgrade @email@example.com to @firstname.lastname@example.org to fix✗ Remote Code Execution (RCE) [Medium Severity][https://snyk.io/vuln/SNYK-JS-BUNYAN-573166] in email@example.com by firstname.lastname@example.org > email@example.com and 8 other path(s)Organization: demo-incPackage manager: yarnTarget file: /var/lib/ghost/versions/2.37.2/package.jsonProject name: ghostDocker image: docker-goof-app
Snyk's remediation guidance helps developers spend less time remediating, and more time developing! One way to tackle vulnerabilities is by choosing a more secure base image. By providing the Dockerfile to
docker scan , Snyk can suggest other Base Images that can be used in the Dockerfile's
FROM statement to bring down those vulnerability counts.
These are grouped by how likely they are to be compatible with your application:
Minor upgrades are the most likely to be compatible with little work,
Major upgrades can introduce breaking changes depending on image usage,
Alternative architecture images are shown for more technical users to investigate.
Organization: demo-incPackage manager: debTarget file: DockerfileProject name: docker-image|$DockerId/docker-goofDocker image: $DockerId/docker-goofBase image: node:10.4.0Licenses: enabledTested 382 dependencies for known issues, found 459 issues.Base Image Vulnerabilities Severitynode:10.4.0 951 451 high, 480 medium, 20 lowRecommendations for base image upgrade:Minor upgradesBase Image Vulnerabilities Severitynode:10.22 498 53 high, 48 medium, 397 lowMajor upgradesBase Image Vulnerabilities Severitynode:14.13 497 53 high, 47 medium, 397 lowAlternative image typesBase Image Vulnerabilities Severitynode:14.13-buster-slim 51 9 high, 4 medium, 38 lownode:14.12.0-slim 70 17 high, 7 medium, 46 lownode:14.11.0-stretch-slim 70 17 high, 7 medium, 46 lownode:14.13.1-buster 254 31 high, 30 medium, 193 low
Let's choose a more secure base image for docker-goof. We'll do this by applying the
Minor upgrade recommended by Snyk. Change the FROM statement in the Dockerfile:
# Comment out the old FROM Statement# FROM node:10.4.0# Write in the new oneFROM node:10.22RUN apt-get install -y imagemagick
Now build the new Image, and push it to Docker Hub. To see results side-by-side with the previous scan, we'll specify a different tag when building the image.
docker build -t $DockerId/docker-goof:v2 -f Dockerfile .
Once pushed, you can see the results in Docker Hub. The base image we used in our
v2 tag has significantly reduced the number of vulnerabilities present in docker-goof!
Continue this cycle of build-scan-push until you're running the most secure base image.
We hope you enjoyed this Lab! Applying a more secure base image is a great first step toward making your images more secure. As noted above, vulnerabilities can come from your application dependencies and Dockerfile user instructions as well.
Check out the other courses in the Snyk Academy to learn how Snyk helps you fix those vulnerabilities and further reduce the vulnerability counts for your images in Docker Hub.
As we continue to evolve our Partnership with Docker, we'll keep adding new capabilities that help developers build their container images securely and deploy with confidence. Try out this workflow on your own applications, and let us know what you think!