Detect application vulnerabilities in container images
In one scan, Snyk can detect the vulnerabilities in your application dependencies from container images, as well as from the operating system.
Detecting application vulnerabilities is intended for scanning third-party images. This feature was not designed for detecting issues in code developed in-house, where the user has access to the source code and can shift left and detect Issues earlier in the SDLC by using Snyk Code and Snyk Open Source.
Detecting application vulnerabilities in container images for Container Registry integration is supported for Node, Ruby, PHP, Python, Go binaries, and Java. For the CLI and Kubernetes, this feature is supported for Node, PHP, Python, Go binaries, and Java.
After you integrate with a container registry and import your Projects, Snyk scans your image for vulnerabilities.
For application Projects created from images that are imported from container registry integrations, the applications are not re-imported during recurring scans or manual rescans.
Instead, the application dependencies that are found during the initial image import are scanned for new vulnerabilities.
If new dependencies are introduced in an application within an image, they will not be detected by recurring scans or manual rescans. To detect new or updated applications within images from container registries, you must re-import the image to Snyk.
For applications found in images imported from the Kubernetes integration, existing applications will be re-imported, but new apps added to the image will not be imported during recurring scans. To detect new applications within images from Kubernetes, you must re-import the image to Snyk.
Enable container registries vulnerability scan
To enable the application vulnerability scan from container registries:
Navigate to Integrations, and then to your container registry integration settings.
Enable Detect application vulnerabilities and save the changes.
When you are scanning an image using a container registry or Kubernetes integration, the scan also uses the --app-vulns flag by default. You can opt out of the flag in the container registry only. To do this, disable the Detect application vulnerabilities feature.
Snyk Container CLI options to detect vulnerabilities
App vulns option
In CLI versions 1.1090.0 (2023-01-24) and higher, Snyk scans for application dependencies in your image by default; you do not need to specify the --app-vulns option.
If you want to opt out of application vulnerability scanning, you can specify the --exclude-app-vulns option. This omits the application vulnerabilities section from the results, mimicking the previous behavior. The --exclude-app-vulns option is available in CLI version 1.1021.0 and above.
Java applications
Snyk Container CLI supports scanning Java applications embedded in container images as JARs or uber -jars. In the case of uber-jars or shaded jars, Snyk uses the pom.properties manifest file to resolve package versions and dependencies. The presence of the pom.properties file in a JAR file depends on how the JAR was built and what tools and configurations were used during the build process. Maven and Maven Shade Plugin built JARs include pom.properties manifest file by default.
Nested jars depth option
When --app-vulns is enabled, you can also use the --nested-jars-depth=n option to set how many levels of nested jars Snyk will unpack. The implicit default is 1. When you specify 2, it means that Snyk unzips jars in jars; 3 means Snyk unzips jars in jars in jars, and so on.
To opt out of any scans you feel are unnecessary, use --nested-jar-depth=0 .
Maven packages suffixed with a version of @unknown
Snyk Container CLI could report Maven packages suffixed with a version of @unknown when pom.properties manifest file is not included in the scanned JARs. For details of other reasons why the package version is reported as @unknown, see Why-does-my-Maven-package-show-Unknown-through-the-SCM.
View application vulnerabilities and licensing issues
When the Detect application vulnerabilities feature is enabled, it allows you to see:
Dependency vulnerabilities and licensing issues of manifest files detected in your container image
Vulnerabilities detected in operating system packages.
When an image is imported to Snyk, it appears under its registry record in the Projects view, showing the operating system vulnerabilities found in your image.
With this feature enabled, you can also see nested manifest files detected in the image and their vulnerabilities and licensing issues.
Set up automated scanning
Depending on your Project settings, Snyk scans the image regularly. Based on your configuration, Snyk updates you by email or Slack whenever new vulnerabilities are identified in both the operating system and application dependencies.
You can set the scan frequency for each Project. The default is daily testing. To update the scan frequency, navigate to the Settings tab on the Project page and select the frequency from the dropdown. The options are never, daily, or weekly.
Supported container registries
The following container registries are supported:
Docker Hub
GCR
ACR
Amazon ECR
JFrog Artifactory
Harbor
Quay
GitHub
Nexus
DigitalOcean
GitLab
Supported integrations
The supported languages work with the following integrations:
Language
Container Registry
CLI
Kubernetes
Node
Yes
Yes
Yes
Ruby
Yes
PHP
Yes
Yes
Yes
Python
Yes
Yes
Yes
Go Binaries
Yes
Yes
Yes
Java
Yes
Yes
Yes
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