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A vulnerability scanner for container images and filesystems

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Static Analysis + Unit + Integration Acceptance Go Report Card GitHub release GitHub go.mod Go version License: Apache-2.0 Slack Invite OpenSSF Scorecard

A vulnerability scanner for container images and filesystems. Easily install the binary to try it out. Works with Syft, the powerful SBOM (software bill of materials) tool for container images and filesystems.

Join our community meetings!

For commercial support options with Syft or Grype, please contact Anchore

grype-demo

Features

  • Scan the contents of a container image or filesystem to find known vulnerabilities.
  • Find vulnerabilities for major operating system packages:
    • Alpine
    • Amazon Linux
    • BusyBox
    • CentOS
    • Debian
    • Distroless
    • Oracle Linux
    • Red Hat (RHEL)
    • Ubuntu
  • Find vulnerabilities for language-specific packages:
    • Ruby (Gems)
    • Java (JAR, WAR, EAR, JPI, HPI)
    • JavaScript (NPM, Yarn)
    • Python (Egg, Wheel, Poetry, requirements.txt/setup.py files)
    • Dotnet (deps.json)
    • Golang (go.mod)
    • PHP (Composer)
    • Rust (Cargo)
  • Supports Docker, OCI and Singularity image formats.

If you encounter an issue, please let us know using the issue tracker.

Installation

Recommended

curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b /usr/local/bin

You can also choose another destination directory and release version for the installation. The destination directory doesn't need to be /usr/local/bin, it just needs to be a location found in the user's PATH and writable by the user that's installing Grype.

curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b <DESTINATION_DIR> <RELEASE_VERSION>

Homebrew

brew tap anchore/grype
brew install grype

MacPorts

On macOS, Grype can additionally be installed from the community maintained port via MacPorts:

sudo port install grype

Note: Currently, Grype is built only for macOS and Linux.

From source

See DEVELOPING.md for instructions to build and run from source.

GitHub Actions

If you're using GitHub Actions, you can simply use our Grype-based action to run vulnerability scans on your code or container images during your CI workflows.

Getting started

Install the binary, and make sure that grype is available in your path. To scan for vulnerabilities in an image:

grype <image>

The above command scans for vulnerabilities that are visible in the container (i.e., the squashed representation of the image). To include software from all image layers in the vulnerability scan, regardless of its presence in the final image, provide --scope all-layers:

grype <image> --scope all-layers

To run grype from a Docker container so it can scan a running container, use the following command:

docker run --rm \
--volume /var/run/docker.sock:/var/run/docker.sock \
--name Grype anchore/grype:latest \
$(ImageName):$(ImageTag)

Supported sources

Grype can scan a variety of sources beyond those found in Docker.

# scan a container image archive (from the result of `docker image save ...`, `podman save ...`, or `skopeo copy` commands)
grype path/to/image.tar

# scan a Singularity Image Format (SIF) container
grype path/to/image.sif

# scan a directory
grype dir:path/to/dir

Sources can be explicitly provided with a scheme:

podman:yourrepo/yourimage:tag          use images from the Podman daemon
docker:yourrepo/yourimage:tag          use images from the Docker daemon
docker-archive:path/to/yourimage.tar   use a tarball from disk for archives created from "docker save"
oci-archive:path/to/yourimage.tar      use a tarball from disk for OCI archives (from Skopeo or otherwise)
oci-dir:path/to/yourimage              read directly from a path on disk for OCI layout directories (from Skopeo or otherwise)
singularity:path/to/yourimage.sif      read directly from a Singularity Image Format (SIF) container on disk
dir:path/to/yourproject                read directly from a path on disk (any directory)
sbom:path/to/syft.json                 read Syft JSON from path on disk
registry:yourrepo/yourimage:tag        pull image directly from a registry (no container runtime required)

If an image source is not provided and cannot be detected from the given reference it is assumed the image should be pulled from the Docker daemon. If docker is not present, then the Podman daemon is attempted next, followed by reaching out directly to the image registry last.

This default behavior can be overridden with the default-image-pull-source configuration option (See Configuration for more details).

Use SBOMs for even faster vulnerability scanning in Grype:

# Then scan for new vulnerabilities as frequently as needed
grype sbom:./sbom.json

# (You can also pipe the SBOM into Grype)
cat ./sbom.json | grype

Grype supports input of Syft, SPDX, and CycloneDX SBOM formats. If Syft has generated any of these file types, they should have the appropriate information to work properly with Grype. It is also possible to use SBOMs generated by other tools with varying degrees of success. Two things that make Grype matching more successful are inclusion of CPE and Linux distribution information. If an SBOM does not include any CPE information, it is possible to generate these based on package information using the --add-cpes-if-none flag. To specify a distribution, use the --distro <distro>:<version> flag. A full example is:

grype --add-cpes-if-none --distro alpine:3.10 sbom:some-apline-3.10.spdx.json

Working with attestations

Grype supports scanning SBOMs as input via stdin. Users can use cosign to verify attestations with an SBOM as its content to scan an image for vulnerabilities:

COSIGN_EXPERIMENTAL=1 cosign verify-attestation caphill4/java-spdx-tools:latest \
| jq -r .payload \
| base64 --decode \
| jq -r .predicate.Data \
| grype

Vulnerability Summary

Basic Grype Vulnerability Data Shape

 {
  "vulnerability": {
    ...
  },
  "relatedVulnerabilities": [
    ...
  ],
  "matchDetails": [
    ...
  ],
  "artifact": {
    ...
  }
}
  • Vulnerability: All information on the specific vulnerability that was directly matched on (e.g. ID, severity, CVSS score, fix information, links for more information)
  • RelatedVulnerabilities: Information pertaining to vulnerabilities found to be related to the main reported vulnerability. Maybe the vulnerability we matched on was a GitHub Security Advisory, which has an upstream CVE (in the authoritative national vulnerability database). In these cases we list the upstream vulnerabilities here.
  • MatchDetails: This section tries to explain what we searched for while looking for a match and exactly what details on the package and vulnerability that lead to a match.
  • Artifact: This is a subset of the information that we know about the package (when compared to the Syft json output, we summarize the metadata section). This has information about where within the container image or directory we found the package, what kind of package it is, licensing info, pURLs, CPEs, etc.

Excluding file paths

Grype can exclude files and paths from being scanned within a source by using glob expressions with one or more --exclude parameters:

grype <source> --exclude './out/**/*.json' --exclude /etc

Note: in the case of image scanning, since the entire filesystem is scanned it is possible to use absolute paths like /etc or /usr/**/*.txt whereas directory scans exclude files relative to the specified directory. For example: scanning /usr/foo with --exclude ./package.json would exclude /usr/foo/package.json and --exclude '**/package.json' would exclude all package.json files under /usr/foo. For directory scans, it is required to begin path expressions with ./, */, or **/, all of which will be resolved relative to the specified scan directory. Keep in mind, your shell may attempt to expand wildcards, so put those parameters in single quotes, like: '**/*.json'.

External Sources

Grype can be configured to incorporate external data sources for added fidelity in vulnerability matching. This feature is currently disabled by default. To enable this feature add the following to the grype config:

external-sources:
  enable: true
  maven:
    search-upstream-by-sha1: true
    base-url: https://search.maven.org/solrsearch/select

You can also configure the base-url if you're using another registry as your maven endpoint.

Output formats

The output format for Grype is configurable as well:

grype <image> -o <format>

Where the formats available are:

Using templates

Grype lets you define custom output formats, using Go templates. Here's how it works:

  • Define your format as a Go template, and save this template as a file.

  • Set the output format to "template" (-o template).

  • Specify the path to the template file (-t ./path/to/custom.template).

  • Grype's template processing uses the same data models as the json output format — so if you're wondering what data is available as you author a template, you can use the output from grype <image> -o json as a reference.

Please note: Templates can access information about the system they are running on, such as environment variables. You should never run untrusted templates.

There are several example templates in the templates directory in the Grype source which can serve a starting point for a custom output format. For example, csv.tmpl produces a vulnerability report in CSV (comma separated value) format:

"Package","Version Installed","Vulnerability ID","Severity"
"coreutils","8.30-3ubuntu2","CVE-2016-2781","Low"
"libc-bin","2.31-0ubuntu9","CVE-2016-10228","Negligible"
"libc-bin","2.31-0ubuntu9","CVE-2020-6096","Low"
...

You can also find the template for the default "table" output format in the same place.

Grype also includes a vast array of utility templating functions from sprig apart from the default golang text/template to allow users to customize the output from Grype.

Gating on severity of vulnerabilities

You can have Grype exit with an error if any vulnerabilities are reported at or above the specified severity level. This comes in handy when using Grype within a script or CI pipeline. To do this, use the --fail-on <severity> CLI flag.

For example, here's how you could trigger a CI pipeline failure if any vulnerabilities are found in the ubuntu:latest image with a severity of "medium" or higher:

grype ubuntu:latest --fail-on medium

Specifying matches to ignore

If you're seeing Grype report false positives or any other vulnerability matches that you just don't want to see, you can tell Grype to ignore matches by specifying one or more "ignore rules" in your Grype configuration file (e.g. ~/.grype.yaml). This causes Grype not to report any vulnerability matches that meet the criteria specified by any of your ignore rules.

Each rule can specify any combination of the following criteria:

  • vulnerability ID (e.g. "CVE-2008-4318")
  • namespace (e.g. "nvd")
  • fix state (allowed values: "fixed", "not-fixed", "wont-fix", or "unknown")
  • package name (e.g. "libcurl")
  • package version (e.g. "1.5.1")
  • package language (e.g. "python"; these values are defined here)
  • package type (e.g. "npm"; these values are defined here)
  • package location (e.g. "/usr/local/lib/node_modules/**"; supports glob patterns)

Here's an example ~/.grype.yaml that demonstrates the expected format for ignore rules:

ignore:
  # This is the full set of supported rule fields:
  - vulnerability: CVE-2008-4318
    fix-state: unknown
    package:
      name: libcurl
      version: 1.5.1
      type: npm
      location: "/usr/local/lib/node_modules/**"

  # We can make rules to match just by vulnerability ID:
  - vulnerability: CVE-2014-54321

  # ...or just by a single package field:
  - package:
      type: gem

Vulnerability matches will be ignored if any rules apply to the match. A rule is considered to apply to a given vulnerability match only if all fields specified in the rule apply to the vulnerability match.

When you run Grype while specifying ignore rules, the following happens to the vulnerability matches that are "ignored":

  • Ignored matches are completely hidden from Grype's output, except for when using the json or template output formats; however, in these two formats, the ignored matches are removed from the existing matches array field, and they are placed in a new ignoredMatches array field. Each listed ignored match also has an additional field, appliedIgnoreRules, which is an array of any rules that caused Grype to ignore this vulnerability match.

  • Ignored matches do not factor into Grype's exit status decision when using --fail-on <severity>. For instance, if a user specifies --fail-on critical, and all of the vulnerability matches found with a "critical" severity have been ignored, Grype will exit zero.

Note: Please continue to report any false positives you see! Even if you can reliably filter out false positives using ignore rules, it's very helpful to the Grype community if we have as much knowledge about Grype's false positives as possible. This helps us continuously improve Grype!

Showing only "fixed" vulnerabilities

If you only want Grype to report vulnerabilities that have a confirmed fix, you can use the --only-fixed flag. (This automatically adds ignore rules into Grype's configuration, such that vulnerabilities that aren't fixed will be ignored.)

For example, here's a scan of Alpine 3.10:

NAME          INSTALLED  FIXED-IN   VULNERABILITY   SEVERITY
apk-tools     2.10.6-r0  2.10.7-r0  CVE-2021-36159  Critical
libcrypto1.1  1.1.1k-r0             CVE-2021-3711   Critical
libcrypto1.1  1.1.1k-r0             CVE-2021-3712   High
libssl1.1     1.1.1k-r0             CVE-2021-3712   High
libssl1.1     1.1.1k-r0             CVE-2021-3711   Critical

...and here's the same scan, but adding the flag --only-fixed:

NAME       INSTALLED  FIXED-IN   VULNERABILITY   SEVERITY
apk-tools  2.10.6-r0  2.10.7-r0  CVE-2021-36159  Critical

If you want Grype to only report vulnerabilities that do not have a confirmed fix, you can use the --only-notfixed flag. (This automatically adds ignore rules into Grype's configuration, such that vulnerabilities that are fixed will be ignored.)

Grype's database

When Grype performs a scan for vulnerabilities, it does so using a vulnerability database that's stored on your local filesystem, which is constructed by pulling data from a variety of publicly available vulnerability data sources. These sources include:

By default, Grype automatically manages this database for you. Grype checks for new updates to the vulnerability database to make sure that every scan uses up-to-date vulnerability information. This behavior is configurable. For more information, see the Managing Grype's database section.

How database updates work

Grype's vulnerability database is a SQLite file, named vulnerability.db. Updates to the database are atomic: the entire database is replaced and then treated as "readonly" by Grype.

Grype's first step in a database update is discovering databases that are available for retrieval. Grype does this by requesting a "listing file" from a public endpoint:

https://toolbox-data.anchore.io/grype/databases/listing.json

The listing file contains entries for every database that's available for download.

Here's an example of an entry in the listing file:

{
  "built": "2021-10-21T08:13:41Z",
  "version": 3,
  "url": "https://toolbox-data.anchore.io/grype/databases/vulnerability-db_v3_2021-10-21T08:13:41Z.tar.gz",
  "checksum": "sha256:8c99fb4e516f10b304f026267c2a73a474e2df878a59bf688cfb0f094bfe7a91"
}

With this information, Grype can select the correct database (the most recently built database with the current schema version), download the database, and verify the database's integrity using the listed checksum value.

Managing Grype's database

Note: During normal usage, there is no need for users to manage Grype's database! Grype manages its database behind the scenes. However, for users that need more control, Grype provides options to manage the database more explicitly.

Local database cache directory

By default, the database is cached on the local filesystem in the directory $XDG_CACHE_HOME/grype/db/<SCHEMA-VERSION>/. For example, on macOS, the database would be stored in ~/Library/Caches/grype/db/3/. (For more information on XDG paths, refer to the XDG Base Directory Specification.)

You can set the cache directory path using the environment variable GRYPE_DB_CACHE_DIR.

Data staleness

Grype needs up-to-date vulnerability information to provide accurate matches. By default, it will fail execution if the local database was not built in the last 5 days. The data staleness check is configurable via the environment variable GRYPE_DB_MAX_ALLOWED_BUILT_AGE and GRYPE_DB_VALIDATE_AGE or the field max-allowed-built-age and validate-age, under db. It uses golang's time duration syntax. Set GRYPE_DB_VALIDATE_AGE or validate-age to false to disable staleness check.

Offline and air-gapped environments

By default, Grype checks for a new database on every run, by making a network call over the Internet. You can tell Grype not to perform this check by setting the environment variable GRYPE_DB_AUTO_UPDATE to false.

As long as you place Grype's vulnerability.db and metadata.json files in the cache directory for the expected schema version, Grype has no need to access the network. Additionally, you can get a listing of the database archives available for download from the grype db list command in an online environment, download the database archive, transfer it to your offline environment, and use grype db import <db-archive-path> to use the given database in an offline capacity.

If you would like to distribute your own Grype databases internally without needing to use db import manually you can leverage Grype's DB update mechanism. To do this you can craft your own listing.json file similar to the one found publically (see grype db list -o raw for an example of our public listing.json file) and change the download URL to point to an internal endpoint (e.g. a private S3 bucket, an internal file server, etc). Any internal installation of Grype can receive database updates automatically by configuring the db.update-url (same as the GRYPE_DB_UPDATE_URL environment variable) to point to the hosted listing.json file you've crafted.

CLI commands for database management

Grype provides database-specific CLI commands for users that want to control the database from the command line. Here are some of the useful commands provided:

grype db status — report the current status of Grype's database (such as its location, build date, and checksum)

grype db check — see if updates are available for the database

grype db update — ensure the latest database has been downloaded to the cache directory (Grype performs this operation at the beginning of every scan by default)

grype db list — download the listing file configured at db.update-url and show databases that are available for download

grype db import — provide grype with a database archive to explicitly use (useful for offline DB updates)

Find complete information on Grype's database commands by running grype db --help.

Shell completion

Grype supplies shell completion through its CLI implementation (cobra). Generate the completion code for your shell by running one of the following commands:

  • grype completion <bash|zsh|fish>
  • go run ./cmd/grype completion <bash|zsh|fish>

This will output a shell script to STDOUT, which can then be used as a completion script for Grype. Running one of the above commands with the -h or --help flags will provide instructions on how to do that for your chosen shell.

Private Registry Authentication

Local Docker Credentials

When a container runtime is not present, grype can still utilize credentials configured in common credential sources (such as ~/.docker/config.json). It will pull images from private registries using these credentials. The config file is where your credentials are stored when authenticating with private registries via some command like docker login. For more information see the go-containerregistry documentation.

An example config.json looks something like this:

// config.json
{
	"auths": {
		"registry.example.com": {
			"username": "AzureDiamond",
			"password": "hunter2"
		}
	}
}

You can run the following command as an example. It details the mount/environment configuration a container needs to access a private registry:

docker run -v ./config.json:/config/config.json -e "DOCKER_CONFIG=/config" anchore/grype:latest <private_image>

Docker Credentials in Kubernetes

The below section shows a simple workflow on how to mount this config file as a secret into a container on kubernetes.

  1. Create a secret. The value of config.json is important. It refers to the specification detailed here. Below this section is the secret.yaml file that the pod configuration will consume as a volume. The key config.json is important. It will end up being the name of the file when mounted into the pod. 
    
    apiVersion: v1
    kind: Secret
    metadata:
      name: registry-config
      namespace: grype
    data:
      config.json: <base64 encoded config.json>
    ```

    `kubectl apply -f secret.yaml`
  2. Create your pod running grype. The env DOCKER_CONFIG is important because it advertises where to look for the credential file. In the below example, setting DOCKER_CONFIG=/config informs grype that credentials can be found at /config/config.json. This is why we used config.json as the key for our secret. When mounted into containers the secrets' key is used as the filename. The volumeMounts section mounts our secret to /config. The volumes section names our volume and leverages the secret we created in step one. 
    
    apiVersion: v1
    kind: Pod
    spec:
      containers:
        - image: anchore/grype:latest
          name: grype-private-registry-demo
          env:
            - name: DOCKER_CONFIG
              value: /config
          volumeMounts:
          - mountPath: /config
            name: registry-config
            readOnly: true
          args:
            - <private_image>
      volumes:
      - name: registry-config
        secret:
          secretName: registry-config
    ```

    `kubectl apply -f pod.yaml`
  3. The user can now run kubectl logs grype-private-registry-demo. The logs should show the grype analysis for the <private_image> provided in the pod configuration.

Using the above information, users should be able to configure private registry access without having to do so in the grype or syft configuration files. They will also not be dependent on a docker daemon, (or some other runtime software) for registry configuration and access.

Configuration

Default configuration search paths:

  • .grype.yaml
  • .grype/config.yaml
  • ~/.grype.yaml
  • <XDG_CONFIG_HOME>/grype/config.yaml

You can also use the --config / -c flag to provide your own configuration file/path:

grype <image> -c /path/to/config.yaml

Configuration options (example values are the default):

# enable/disable checking for application updates on startup
# same as GRYPE_CHECK_FOR_APP_UPDATE env var
check-for-app-update: true

# allows users to specify which image source should be used to generate the sbom
# valid values are: registry, docker, podman
# same as GRYPE_DEFAULT_IMAGE_PULL_SOURCE env var
default-image-pull-source: ""

# same as --name; set the name of the target being analyzed
name: ""

# upon scanning, if a severity is found at or above the given severity then the return code will be 1
# default is unset which will skip this validation (options: negligible, low, medium, high, critical)
# same as --fail-on ; GRYPE_FAIL_ON_SEVERITY env var
fail-on-severity: ""

# the output format of the vulnerability report (options: table, json, cyclonedx)
# same as -o ; GRYPE_OUTPUT env var
output: "table"

# suppress all output (except for the vulnerability list)
# same as -q ; GRYPE_QUIET env var
quiet: false

# write output report to a file (default is to write to stdout)
# same as --file; GRYPE_FILE env var
file: ""

# a list of globs to exclude from scanning, for example:
# exclude:
#   - '/etc/**'
#   - './out/**/*.json'
# same as --exclude ; GRYPE_EXCLUDE env var
exclude: []

# os and/or architecture to use when referencing container images (e.g. "windows/armv6" or "arm64")
# same as --platform; GRYPE_PLATFORM env var
platform: ""

# If using SBOM input, automatically generate CPEs when packages have none
add-cpes-if-none: false

# Explicitly specify a linux distribution to use as <distro>:<version> like alpine:3.10
distro:

external-sources:
  enable: false
  maven:
    search-upstream-by-sha1: true
    base-url: https://search.maven.org/solrsearch/select

db:
  # check for database updates on execution
  # same as GRYPE_DB_AUTO_UPDATE env var
  auto-update: true

  # location to write the vulnerability database cache
  # same as GRYPE_DB_CACHE_DIR env var
  cache-dir: "$XDG_CACHE_HOME/grype/db"

  # URL of the vulnerability database
  # same as GRYPE_DB_UPDATE_URL env var
  update-url: "https://toolbox-data.anchore.io/grype/databases/listing.json"

  # it ensures db build is no older than the max-allowed-built-age
  # set to false to disable check
  validate-age: true

  # Max allowed age for vulnerability database,
  # age being the time since it was built
  # Default max age is 120h (or five days)
  max-allowed-built-age: "120h"

search:
  # the search space to look for packages (options: all-layers, squashed)
  # same as -s ; GRYPE_SEARCH_SCOPE env var
  scope: "squashed"

  # search within archives that do contain a file index to search against (zip)
  # note: for now this only applies to the java package cataloger
  # same as GRYPE_PACKAGE_SEARCH_INDEXED_ARCHIVES env var
  indexed-archives: true

  # search within archives that do not contain a file index to search against (tar, tar.gz, tar.bz2, etc)
  # note: enabling this may result in a performance impact since all discovered compressed tars will be decompressed
  # note: for now this only applies to the java package cataloger
  # same as GRYPE_PACKAGE_SEARCH_UNINDEXED_ARCHIVES env var
  unindexed-archives: false

# options when pulling directly from a registry via the "registry:" scheme
registry:
  # skip TLS verification when communicating with the registry
  # same as GRYPE_REGISTRY_INSECURE_SKIP_TLS_VERIFY env var
  insecure-skip-tls-verify: false
  # use http instead of https when connecting to the registry
  # same as GRYPE_REGISTRY_INSECURE_USE_HTTP env var
  insecure-use-http: false

  # credentials for specific registries
  auth:
    - # the URL to the registry (e.g. "docker.io", "localhost:5000", etc.)
      # same as GRYPE_REGISTRY_AUTH_AUTHORITY env var
      authority: ""
      # same as GRYPE_REGISTRY_AUTH_USERNAME env var
      username: ""
      # same as GRYPE_REGISTRY_AUTH_PASSWORD env var
      password: ""
      # note: token and username/password are mutually exclusive
      # same as GRYPE_REGISTRY_AUTH_TOKEN env var
      token: ""
    - ... # note, more credentials can be provided via config file only

log:
  # use structured logging
  # same as GRYPE_LOG_STRUCTURED env var
  structured: false

  # the log level; note: detailed logging suppress the ETUI
  # same as GRYPE_LOG_LEVEL env var
  # Uses logrus logging levels: https://github.com/sirupsen/logrus#level-logging
  level: "error"

  # location to write the log file (default is not to have a log file)
  # same as GRYPE_LOG_FILE env var
  file: ""

match:
  # sets the matchers below to use cpes when trying to find 
  # vulnerability matches. The stock matcher is the default
  # when no primary matcher can be identified 
  java:
    using-cpes: true
  python:
    using-cpes: true
  javascript:
    using-cpes: true
  ruby:
    using-cpes: true
  dotnet:
    using-cpes: true
  golang:
    using-cpes: true
  stock:
    using-cpes: true

Future plans

The following areas of potential development are currently being investigated:

  • Support for allowlist, package mapping

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A vulnerability scanner for container images and filesystems

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