---
type: reference, howto
---

# Container Scanning **(ULTIMATE)**

> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/3672)
in [GitLab Ultimate](https://about.gitlab.com/pricing/) 10.4.

## Overview

If you are using [GitLab CI/CD](../../../ci/README.md), you can check your Docker
images (or more precisely the containers) for known vulnerabilities by using
[Clair](https://github.com/coreos/clair) and [klar](https://github.com/optiopay/klar),
two open source tools for Vulnerability Static Analysis for containers.

You can take advantage of Container Scanning by either [including the CI job](#configuration) in
your existing `.gitlab-ci.yml` file or by implicitly using
[Auto Container Scanning](../../../topics/autodevops/index.md#auto-container-scanning-ultimate)
that is provided by [Auto DevOps](../../../topics/autodevops/index.md).

GitLab checks the Container Scanning report, compares the found vulnerabilities
between the source and target branches, and shows the information right on the
merge request.

![Container Scanning Widget](img/container_scanning_v12_9.png)

## Contribute your scanner

The [Security Scanner Integration](../../../development/integrations/secure.md) documentation explains how to integrate other security scanners into GitLab.

## Use cases

If you distribute your application with Docker, then there's a great chance
that your image is based on other Docker images that may in turn contain some
known vulnerabilities that could be exploited.

Having an extra job in your pipeline that checks for those vulnerabilities,
and the fact that they are displayed inside a merge request, makes it very easy
to perform audits for your Docker-based apps.

[//]: # "NOTE: The container scanning tool references the following heading in the code, so if you"
[//]: # "      make a change to this heading, make sure to update the documentation URLs used in the"
[//]: # "      container scanning tool (https://gitlab.com/gitlab-org/security-products/analyzers/klar)"

## Requirements

To enable Container Scanning in your pipeline, you need:

- A GitLab Runner with the
  [`docker`](https://docs.gitlab.com/runner/executors/docker.html) or
  [`kubernetes`](https://docs.gitlab.com/runner/install/kubernetes.html)
  executor.
- Docker `18.09.03` or higher installed on the machine where the Runners are
  running. If you're using the shared Runners on GitLab.com, this is already
  the case.
- To [build and push](../../packages/container_registry/index.md#container-registry-examples-with-gitlab-cicd)
  your Docker image to your project's Container Registry.
  The name of the Docker image should use the following
  [predefined environment variables](../../../ci/variables/predefined_variables.md)
  as defined below:

  ```text
  $CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG:$CI_COMMIT_SHA
  ```

  These can be used directly in your `.gitlab-ci.yml` file:

  ```yaml
  build:
    image: docker:19.03.1
    stage: build
    services:
      - docker:19.03.1-dind
    variables:
      IMAGE_TAG: $CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG:$CI_COMMIT_SHA
    script:
      - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
      - docker build -t $IMAGE_TAG .
      - docker push $IMAGE_TAG
  ```

## Configuration

For GitLab 11.9 and later, to enable Container Scanning, you must
[include](../../../ci/yaml/README.md#includetemplate) the
[`Container-Scanning.gitlab-ci.yml` template](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Security/Container-Scanning.gitlab-ci.yml)
that's provided as a part of your GitLab installation.
For GitLab versions earlier than 11.9, you can copy and use the job as defined
in that template.

Add the following to your `.gitlab-ci.yml` file:

```yaml
include:
  - template: Container-Scanning.gitlab-ci.yml
```

The included template will:

1. Create a `container_scanning` job in your CI/CD pipeline.
1. Pull the already built Docker image from your project's
   [Container Registry](../../packages/container_registry/index.md) (see [requirements](#requirements))
   and scan it for possible vulnerabilities.

The results will be saved as a
[Container Scanning report artifact](../../../ci/yaml/README.md#artifactsreportscontainer_scanning-ultimate)
that you can later download and analyze.
Due to implementation limitations, we always take the latest Container Scanning
artifact available. Behind the scenes, the
[GitLab Klar analyzer](https://gitlab.com/gitlab-org/security-products/analyzers/klar/)
is used and runs the scans.

The following is a sample `.gitlab-ci.yml` that will build your Docker image,
push it to the Container Registry, and run Container Scanning:

```yaml
variables:
  DOCKER_DRIVER: overlay2

services:
  - docker:19.03.5-dind

stages:
  - build
  - test

build:
  image: docker:stable
  stage: build
  variables:
    IMAGE: $CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG:$CI_COMMIT_SHA
  script:
    - docker info
    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
    - docker build -t $IMAGE .
    - docker push $IMAGE

include:
  - template: Container-Scanning.gitlab-ci.yml
```

### Customizing the Container Scanning settings

You can change container scanning settings by using the [`variables`](../../../ci/yaml/README.md#variables)
parameter in your `.gitlab-ci.yml` to change [environment variables](#available-variables).

In the following example, we [include](../../../ci/yaml/README.md#include) the template and also
set the `CLAIR_OUTPUT` variable to `High`:

```yaml
include:
  template: Container-Scanning.gitlab-ci.yml

variables:
  CLAIR_OUTPUT: High
```

The `CLAIR_OUTPUT` variable defined in the main `gitlab-ci.yml` will overwrite what's
defined in `Container-Scanning.gitlab-ci.yml`, changing the Container Scanning behavior.

[//]: # "NOTE: The container scanning tool references the following heading in the code, so if you"
[//]: # "      make a change to this heading, make sure to update the documentation URLs used in the"
[//]: # "      container scanning tool (https://gitlab.com/gitlab-org/security-products/analyzers/klar)"

#### Available variables

Container Scanning can be [configured](#customizing-the-container-scanning-settings)
using environment variables.

| Environment Variable           | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Default                                                                                                         |
| ------                         | ------                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | ------                                                                                                          |
| `KLAR_TRACE`                   | Set to true to enable more verbose output from klar.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | `"false"`                                                                                                       |
| `DOCKER_USER`                  | Username for accessing a Docker registry requiring authentication.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `$CI_REGISTRY_USER`                                                                                             |
| `DOCKER_PASSWORD`              | Password for accessing a Docker registry requiring authentication.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `$CI_REGISTRY_PASSWORD`                                                                                         |
| `CLAIR_OUTPUT`                 | Severity level threshold. Vulnerabilities with severity level higher than or equal to this threshold will be outputted. Supported levels are `Unknown`, `Negligible`, `Low`, `Medium`, `High`, `Critical` and `Defcon1`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | `Unknown`                                                                                                       |
| `REGISTRY_INSECURE`            | Allow [Klar](https://github.com/optiopay/klar) to access insecure registries (HTTP only). Should only be set to `true` when testing the image locally.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | `"false"`                                                                                                       |
| `DOCKER_INSECURE`              | Allow [Klar](https://github.com/optiopay/klar) to access secure Docker registries using HTTPS with bad (or self-signed) SSL certificates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | `"false"`                                                                                                       |
| `CLAIR_VULNERABILITIES_DB_URL` | (**DEPRECATED - use `CLAIR_DB_CONNECTION_STRING` instead**) This variable is explicitly set in the [services section](https://gitlab.com/gitlab-org/gitlab/-/blob/898c5da43504eba87b749625da50098d345b60d6/lib/gitlab/ci/templates/Security/Container-Scanning.gitlab-ci.yml#L23) of the `Container-Scanning.gitlab-ci.yml` file and defaults to `clair-vulnerabilities-db`. This value represents the address that the [Postgres server hosting the vulnerabilities definitions](https://hub.docker.com/r/arminc/clair-db) is running on and **shouldn't be changed** unless you're running the image locally as described in the [Running the standalone Container Scanning Tool](#running-the-standalone-container-scanning-tool) section.                                      | `clair-vulnerabilities-db`                                                                                      |
| `CLAIR_DB_CONNECTION_STRING`   | This variable represents the [connection string](https://www.postgresql.org/docs/9.3/libpq-connect.html#AEN39692) to the [Postgres server hosting the vulnerabilities definitions](https://hub.docker.com/r/arminc/clair-db) database and **shouldn't be changed** unless you're running the image locally as described in the [Running the standalone Container Scanning Tool](#running-the-standalone-container-scanning-tool) section. The host value for the connection string must match the [alias](https://gitlab.com/gitlab-org/gitlab/-/blob/898c5da43504eba87b749625da50098d345b60d6/lib/gitlab/ci/templates/Security/Container-Scanning.gitlab-ci.yml#L23) value of the `Container-Scanning.gitlab-ci.yml` template file, which defaults to `clair-vulnerabilities-db`. | `postgresql://postgres:password@clair-vulnerabilities-db:5432/postgres?sslmode=disable&statement_timeout=60000` |
| `CI_APPLICATION_REPOSITORY`    | Docker repository URL for the image to be scanned.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG`                                                                        |
| `CI_APPLICATION_TAG`           | Docker respository tag for the image to be scanned.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | `$CI_COMMIT_SHA`                                                                                                |
| `CLAIR_DB_IMAGE`               | The Docker image name and tag for the [Postgres server hosting the vulnerabilities definitions](https://hub.docker.com/r/arminc/clair-db). It can be useful to override this value with a specific version, for example, to provide a consistent set of vulnerabilities for integration testing purposes, or to refer to a locally hosted vulnerabilities database for an on-premise air-gapped installation.                                                                                                                                                                                                                                                                                                                                                                      | `arminc/clair-db:latest`                                                                                        |
| `CLAIR_DB_IMAGE_TAG`           | (**DEPRECATED - use `CLAIR_DB_IMAGE` instead**) The Docker image tag for the [Postgres server hosting the vulnerabilities definitions](https://hub.docker.com/r/arminc/clair-db). It can be useful to override this value with a specific version, for example, to provide a consistent set of vulnerabilities for integration testing purposes.                                                                                                                                                                                                                                                                                                                                                                                                                                   | `latest`                                                                                                        |
| `DOCKERFILE_PATH`              | The path to the `Dockerfile` to be used for generating remediations. By default, the scanner will look for a file named `Dockerfile` in the root directory of the project, so this variable should only be configured if your `Dockerfile` is in a non-standard location, such as a subdirectory. See [Solutions for vulnerabilities](#solutions-for-vulnerabilities-auto-remediation) for more details.                                                                                                                                                                                                                                                                                                                                                                          | `Dockerfile`                                                                                                    |
| `ADDITIONAL_CA_CERT_BUNDLE`   | Bundle of CA certs that you want to trust. | "" |

### Overriding the Container Scanning template

If you want to override the job definition (for example, change properties like
`variables`), you need to declare a `container_scanning` job after the
template inclusion and specify any additional keys under it. For example:

```yaml
include:
  template: Container-Scanning.gitlab-ci.yml

container_scanning:
  variables:
    GIT_STRATEGY: fetch
```

### Vulnerability whitelisting

If you want to whitelist specific vulnerabilities, you'll need to:

1. Set `GIT_STRATEGY: fetch` in your `.gitlab-ci.yml` file by following the instructions described in the
   [overriding the Container Scanning template](#overriding-the-container-scanning-template) section of this document.
1. Define the whitelisted vulnerabilities in a YAML file named `clair-whitelist.yml` which must use the format described
   in the [whitelist example file](https://github.com/arminc/clair-scanner/blob/v12/example-whitelist.yaml).
1. Add the `clair-whitelist.yml` file to the Git repository of your project.

### Running Container Scanning in an offline, air-gapped installation

Container Scanning can be executed on an offline air-gapped GitLab Ultimate installation using the following process:

1. Host the following Docker images on a [local Docker container registry](../../packages/container_registry/index.md):
   - [arminc/clair-db vulnerabilities database](https://hub.docker.com/r/arminc/clair-db)
   - GitLab klar analyzer: `registry.gitlab.com/gitlab-org/security-products/analyzers/klar`
1. [Override the container scanning template](#overriding-the-container-scanning-template) in your `.gitlab-ci.yml` file to refer to the Docker images hosted on your local Docker container registry:

   ```yaml
   include:
     - template: Container-Scanning.gitlab-ci.yml

   container_scanning:
     image: $CI_REGISTRY/namespace/gitlab-klar-analyzer
     variables:
       CLAIR_DB_IMAGE: $CI_REGISTRY/namespace/clair-vulnerabilities-db
   ```

1. If your local Docker container registry is running securely over `HTTPS`, but you're using a
   self-signed certificate, then you must set `DOCKER_INSECURE: true` in the above
   `container_scanning` section of your `.gitlab-ci.yml`.

It may be worthwhile to set up a [scheduled pipeline](../../../ci/pipelines/schedules.md) to automatically build a new version of the vulnerabilities database on a preset schedule. You can use the following `.gitlab-yml.ci` as a template:

```yaml
image: docker:stable

services:
  - docker:19.03.5-dind

stages:
  - build

build_latest_vulnerabilities:
  stage: build
  script:
    - docker pull arminc/clair-db:latest
    - docker tag arminc/clair-db:latest $CI_REGISTRY/namespace/clair-vulnerabilities-db
    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
    - docker push $CI_REGISTRY/namespace/clair-vulnerabilities-db
```

The above template will work for a GitLab Docker registry running on a local installation, however, if you're using a non-GitLab Docker registry, you'll need to change the `$CI_REGISTRY` value and the `docker login` credentials to match the details of your local registry.

## Running the standalone Container Scanning Tool

It's possible to run the [GitLab Container Scanning Tool](https://gitlab.com/gitlab-org/security-products/analyzers/klar)
against a Docker container without needing to run it within the context of a CI job. To scan an
image directly, follow these steps:

1. Run [Docker Desktop](https://www.docker.com/products/docker-desktop) or [Docker Machine](https://github.com/docker/machine).
1. Run the latest [prefilled vulnerabilities database](https://cloud.docker.com/repository/docker/arminc/clair-db) Docker image:

   ```shell
   docker run -p 5432:5432 -d --name clair-db arminc/clair-db:latest
   ```

1. Configure an environment variable to point to your local machine's IP address (or insert your IP address instead of the `LOCAL_MACHINE_IP_ADDRESS` variable in the `CLAIR_DB_CONNECTION_STRING` in the next step):

   ```shell
   export LOCAL_MACHINE_IP_ADDRESS=your.local.ip.address
   ```

1. Run the analyzer's Docker image, passing the image and tag you want to analyze in the `CI_APPLICATION_REPOSITORY` and `CI_APPLICATION_TAG` environment variables:

   ```shell
   docker run \
     --interactive --rm \
     --volume "$PWD":/tmp/app \
     -e CI_PROJECT_DIR=/tmp/app \
     -e CLAIR_DB_CONNECTION_STRING="postgresql://postgres:password@${LOCAL_MACHINE_IP_ADDRESS}:5432/postgres?sslmode=disable&statement_timeout=60000" \
     -e CI_APPLICATION_REPOSITORY=registry.gitlab.com/gitlab-org/security-products/dast/webgoat-8.0@sha256 \
     -e CI_APPLICATION_TAG=bc09fe2e0721dfaeee79364115aeedf2174cce0947b9ae5fe7c33312ee019a4e \
     registry.gitlab.com/gitlab-org/security-products/analyzers/klar
   ```

The results are stored in `gl-container-scanning-report.json`.

## Reports JSON format

CAUTION: **Caution:**
The JSON report artifacts are not a public API of Container Scanning and their format may change in the future.

The Container Scanning tool emits a JSON report file. Here is an example of the report structure with all important parts of
it highlighted:

```json-doc
{
  "version": "2.3",
  "vulnerabilities": [
    {
      "category": "container_scanning",
      "message": "CVE-2019-3462 in apt",
      "description": "Incorrect sanitation of the 302 redirect field in HTTP transport method of apt versions 1.4.8 and earlier can lead to content injection by a MITM attacker, potentially leading to remote code execution on the target machine.",
      "cve": "debian:9:apt:CVE-2019-3462",
      "severity": "High",
      "confidence": "Unknown",
      "solution": "Upgrade apt from 1.4.8 to 1.4.9",
      "scanner": {
        "id": "klar",
        "name": "klar"
      },
      "location": {
        "dependency": {
          "package": {
            "name": "apt"
          },
          "version": "1.4.8"
        },
        "operating_system": "debian:9",
        "image": "registry.gitlab.com/gitlab-org/security-products/dast/webgoat-8.0@sha256:bc09fe2e0721dfaeee79364115aeedf2174cce0947b9ae5fe7c33312ee019a4e"
      },
      "identifiers": [
        {
          "type": "cve",
          "name": "CVE-2019-3462",
          "value": "CVE-2019-3462",
          "url": "https://security-tracker.debian.org/tracker/CVE-2019-3462"
        }
      ],
      "links": [
        {
          "url": "https://security-tracker.debian.org/tracker/CVE-2019-3462"
        }
      ]
    }
  ],
  "remediations": [
    {
      "fixes": [
        {
          "cve": "debian:9:apt:CVE-2019-3462"
        }
      ],
      "summary": "Upgrade apt from 1.4.8 to 1.4.9",
      "diff": "YXB0LWdldCB1cGRhdGUgJiYgYXB0LWdldCB1cGdyYWRlIC15IGFwdA=="
    }
  ]
}
```

CAUTION: **Deprecation:**
Beginning with GitLab 12.9, container scanning no longer reports `undefined` severity and confidence levels.

Here is the description of the report file structure nodes and their meaning. All fields are mandatory to be present in
the report JSON unless stated otherwise. Presence of optional fields depends on the underlying analyzers being used.

| Report JSON node                                     | Description                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `version`                                            | Report syntax version used to generate this JSON.                                                                                                                                                                                                                                                                                                                                          |
| `vulnerabilities`                                    | Array of vulnerability objects.                                                                                                                                                                                                                                                                                                                                                            |
| `vulnerabilities[].category`                         | Where this vulnerability belongs (for example, SAST or Container Scanning). For Container Scanning, it will always be `container_scanning`.                                                                                                                                                                                                                                                          |
| `vulnerabilities[].message`                          | A short text that describes the vulnerability, it may include occurrence's specific information. Optional.                                                                                                                                                                                                                                                                                 |
| `vulnerabilities[].description`                      | A long text that describes the vulnerability. Optional.                                                                                                                                                                                                                                                                                                                                    |
| `vulnerabilities[].cve`                              | A fingerprint string value that represents a concrete occurrence of the vulnerability. It's used to determine whether two vulnerability occurrences are same or different. May not be 100% accurate. **This is NOT a [CVE](https://cve.mitre.org/)**.                                                                                                                                      |
| `vulnerabilities[].severity`                         | How much the vulnerability impacts the software. Possible values: `Undefined` (an analyzer has not provided this info), `Info`, `Unknown`, `Low`, `Medium`, `High`, `Critical`.  **Note:** Our current container scanning tool based on [klar](https://github.com/optiopay/klar) only provides the following levels: `Unknown`, `Low`, `Medium`, `High`, `Critical`.                       |
| `vulnerabilities[].confidence`                       | How reliable the vulnerability's assessment is. Possible values: `Undefined` (an analyzer has not provided this info), `Ignore`, `Unknown`, `Experimental`, `Low`, `Medium`, `High`, `Confirmed`.  **Note:** Our current container scanning tool based on [klar](https://github.com/optiopay/klar) does not provide a confidence level, so this value is currently hardcoded to `Unknown`. |
| `vulnerabilities[].solution`                         | Explanation of how to fix the vulnerability. Optional.                                                                                                                                                                                                                                                                                                                                     |
| `vulnerabilities[].scanner`                          | A node that describes the analyzer used to find this vulnerability.                                                                                                                                                                                                                                                                                                                        |
| `vulnerabilities[].scanner.id`                       | Id of the scanner as a snake_case string.                                                                                                                                                                                                                                                                                                                                                  |
| `vulnerabilities[].scanner.name`                     | Name of the scanner, for display purposes.                                                                                                                                                                                                                                                                                                                                                 |
| `vulnerabilities[].location`                         | A node that tells where the vulnerability is located.                                                                                                                                                                                                                                                                                                                                      |
| `vulnerabilities[].location.dependency`              | A node that describes the dependency of a project where the vulnerability is located.                                                                                                                                                                                                                                                                                                      |
| `vulnerabilities[].location.dependency.package`      | A node that provides the information on the package where the vulnerability is located.                                                                                                                                                                                                                                                                                                    |
| `vulnerabilities[].location.dependency.package.name` | Name of the package where the vulnerability is located.                                                                                                                                                                                                                                                                                                                                    |
| `vulnerabilities[].location.dependency.version`      | Version of the vulnerable package. Optional.                                                                                                                                                                                                                                                                                                                                               |
| `vulnerabilities[].location.operating_system`        | The operating system that contains the vulnerable package.                                                                                                                                                                                                                                                                                                                                 |
| `vulnerabilities[].location.image`                   | The Docker image that was analyzed.                                                                                                                                                                                                                                                                                                                                                        |
| `vulnerabilities[].identifiers`                      | An ordered array of references that identify a vulnerability on internal or external DBs.                                                                                                                                                                                                                                                                                                  |
| `vulnerabilities[].identifiers[].type`               | Type of the identifier. Possible values: common identifier types (among `cve`, `cwe`, `osvdb`, and `usn`).                                                                                                                                                                                                                                                                                 |
| `vulnerabilities[].identifiers[].name`               | Name of the identifier for display purpose.                                                                                                                                                                                                                                                                                                                                                |
| `vulnerabilities[].identifiers[].value`              | Value of the identifier for matching purpose.                                                                                                                                                                                                                                                                                                                                              |
| `vulnerabilities[].identifiers[].url`                | URL to identifier's documentation. Optional.                                                                                                                                                                                                                                                                                                                                               |
| `vulnerabilities[].links`                            | An array of references to external documentation pieces or articles that describe the vulnerability further. Optional.                                                                                                                                                                                                                                                                     |
| `vulnerabilities[].links[].name`                     | Name of the vulnerability details link. Optional.                                                                                                                                                                                                                                                                                                                                          |
| `vulnerabilities[].links[].url`                      | URL of the vulnerability details document. Optional.                                                                                                                                                                                                                                                                                                                                       |
| `remediations`                                       | An array of objects containing information on cured vulnerabilities along with patch diffs to apply. Empty if no remediations provided by an underlying analyzer.                                                                                                                                                                                                                          |
| `remediations[].fixes`                               | An array of strings that represent references to vulnerabilities fixed by this particular remediation.                                                                                                                                                                                                                                                                                     |
| `remediations[].fixes[].cve`                         | A string value that describes a fixed vulnerability occurrence in the same format as `vulnerabilities[].cve`.                                                                                                                                                                                                                                                                              |
| `remediations[].summary`                             | Overview of how the vulnerabilities have been fixed.                                                                                                                                                                                                                                                                                                                                       |
| `remediations[].diff`                                | base64-encoded remediation code diff, compatible with [`git apply`](https://git-scm.com/docs/git-format-patch#_discussion).                                                                                                                                                                                                                                                                |

## Security Dashboard

The [Security Dashboard](../security_dashboard/index.md) shows you an overview of all
the security vulnerabilities in your groups, projects and pipelines.

## Vulnerabilities database update

For more information about the vulnerabilities database update, check the
[maintenance table](../index.md#maintenance-and-update-of-the-vulnerabilities-database).

## Interacting with the vulnerabilities

Once a vulnerability is found, you can [interact with it](../index.md#interacting-with-the-vulnerabilities).

## Solutions for vulnerabilities (auto-remediation)

Some vulnerabilities can be fixed by applying the solution that GitLab
automatically generates.

To enable remediation support, the scanning tool _must_ have access to the `Dockerfile` specified by
the `DOCKERFILE_PATH` environment variable. To ensure that the scanning tool has access to this
file, it's necessary to set [`GIT_STRATEGY: fetch`](../../../ci/yaml/README.md#git-strategy) in
your `.gitlab-ci.yml` file by following the instructions described in this document's
[overriding the Container Scanning template](#overriding-the-container-scanning-template) section.

Read more about the [solutions for vulnerabilities](../index.md#solutions-for-vulnerabilities-auto-remediation).

## Troubleshooting

### docker: Error response from daemon: failed to copy xattrs

When the GitLab Runner uses the Docker executor and NFS is used
(for example, `/var/lib/docker` is on an NFS mount), Container Scanning might fail with
an error like the following:

```text
docker: Error response from daemon: failed to copy xattrs: failed to set xattr "security.selinux" on /path/to/file: operation not supported.
```

This is a result of a bug in Docker which is now [fixed](https://github.com/containerd/continuity/pull/138 "fs: add WithAllowXAttrErrors CopyOpt").
To prevent the error, ensure the Docker version that the Runner is using is
`18.09.03` or higher. For more information, see
[issue #10241](https://gitlab.com/gitlab-org/gitlab/issues/10241 "Investigate why Container Scanning is not working with NFS mounts").
