Map container images from code to cloud

When a vulnerability is identified in a container image stored in a container registry or running in a Kubernetes cluster, it can be difficult for a security practitioner to trace back to the CI/CD pipeline that first built the container image and identify a developer remediation owner. With DevOps security capabilities in Microsoft Defender Cloud Security Posture Management (CSPM), you can map your cloud-native applications from code to cloud to easily kick off developer remediation workflows and reduce the time to remediation of vulnerabilities in your container images.

Prerequisites

• An Azure account with Defender for Cloud onboarded. If you don't already have an Azure account, create one for free.

• Azure DevOps or GitHub environment onboarded to Microsoft Defender for Cloud.

  • When an Azure DevOps environment is onboarded to Microsoft Defender for Cloud, the Microsoft Defender for DevOps Container Mapping will be automatically shared and installed in all connected Azure DevOps organizations. This will automatically inject tasks into all Azure Pipelines to collect data for container mapping.

• For Azure DevOps, Microsoft Security DevOps (MSDO) Extension installed on the Azure DevOps organization.

• For GitHub, Microsoft Security DevOps (MSDO) Action configured in your GitHub repositories. Additionally, the GitHub Workflow must have "id-token: write" permissions for federation with Defender for Cloud. For an example, see this YAML.

• Defender CSPM enabled.

• The container images must be built using Docker and the Docker client must be able to access the Docker server during the build.

Map your container image from Azure DevOps pipelines to the container registry

After building a container image in an Azure DevOps CI/CD pipeline and pushing it to a registry, see the mapping by using the Cloud Security Explorer:

1. Sign in to the Azure portal.

2. Go to Microsoft Defender for Cloud > Cloud Security Explorer. It can take a maximum of 4 hours for the container image mapping to appear in the Cloud Security Explorer.

3. To see basic mapping, select Container Images > + > Pushed by code repositories.

   

4. (Optional) Select + by Container Images to add other filters to your query, such as Has vulnerabilities to filter only container images with CVEs.

5. After running your query, you will see the mapping between container registry and Azure DevOps pipeline. Select ... next to the edge to see additional details on where the Azure DevOps pipeline was run.

   

The following is an example of an advanced query that utilizes container image mapping. Starting with a Kubernetes workload that is exposed to the internet, you can trace all container images with high severity CVEs back to the Azure DevOps pipeline where the container image was built, empowering a security practitioner to kick off a developer remediation workflow.

Note

If your Azure DevOps organization had the Azure DevOps connector created prior to November 15, 2023, please navigate to Organization settings > Extensions > Shared and install the container image mapping decorator. If you do not see the extension shared with your organization, fill out the following form.

Map your container image from GitHub workflows to the container registry

1. Add the container image mapping tool to your MSDO workflow:

name: Build and Map Container Image

on: [push, workflow_dispatch]

jobs:
  build:
    runs-on: ubuntu-latest
    # Set Permissions
    permissions:
      contents: read
      id-token: write
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: '3.8' 
    # Set Authentication to Container Registry of Choice
   - name: Azure Container Registry Login 
        uses: Azure/docker-login@v1 
        with:
        login-server: <containerRegistryLoginServer>
        username: ${{ secrets.ACR_USERNAME }}
        password: ${{ secrets.ACR_PASSWORD }}
    # Build and Push Image
    - name: Build and Push the Docker image 
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: ${{ secrets.IMAGE_TAG }}
          file: Dockerfile
     # Run Mapping Tool in MSDO
    - name: Run Microsoft Security DevOps Analysis
      uses: microsoft/security-devops-action@latest
      id: msdo
      with:
        include-tools: container-mapping

After building a container image in a GitHub workflow and pushing it to a registry, see the mapping by using the Cloud Security Explorer:

1. Sign in to the Azure portal.

2. Go to Microsoft Defender for Cloud > Cloud Security Explorer. It can take a maximum of 4 hours for the container image mapping to appear in the Cloud Security Explorer.

3. To see basic mapping, select Container Images > + > Pushed by code repositories.

   

4. (Optional) Select + by Container Images to add other filters to your query, such as Has vulnerabilities to filter only container images with CVEs.

5. After running your query, you will see the mapping between container registry and GitHub workflow. Select ... next to the edge to see additional details on where the GitHub workflow was run.

The following is an example of an advanced query that utilizes container image mapping. Starting with a Kubernetes workload that is exposed to the internet, you can trace all container images with high severity CVEs back to the GitHub repository where the container image was built, empowering a security practitioner to kick off a developer remediation workflow.

Next steps

• Learn more about DevOps security in Defender for Cloud.