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75 lines
3.1 KiB
Markdown
75 lines
3.1 KiB
Markdown
# CVE Differential (`cve-differential`)
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A self-contained Gitea and GitHub Actions composite action that extracts multi-platform SBOM attestations from container images, runs vulnerability scans with [Trivy](https://github.com/aquasecurity/trivy), and produces a set-based CVE delta report between a head image and a target baseline image.
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---
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## ✨ Features
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- **Multi-Platform Support**: Automatically detects and extracts SPDX SBOM attestations for multi arch images.
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- **Fast Attestation Extraction**: Uses `docker buildx imagetools inspect` to extract SBOMs directly from registry manifest indices in seconds without downloading layer blobs.
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- **Graceful Fallbacks**: If SBOM attestations or baseline images are missing, automatically falls back to generating SBOMs directly with Trivy. Using images that do contain an SBOM is highly recomended though!
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- **Set-Based Differential Analysis**: Categorizes vulnerabilities into:
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- 🔴 **Introduced Vulnerabilities** (newly added in this branch / commit)
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- 🟢 **Fixed Vulnerabilities** (present in target baseline, resolved in this branch)
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- ⚪ **Unchanged Vulnerabilities** (pre-existing in target baseline)
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- **Secure by Default**: Verified Trivy binary downloads against static SHA256 checksum lockfiles and single-step unified caching (binary + vulnerability database).
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---
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## 📥 Inputs
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| Input | Description | Required | Default |
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| :--- | :--- | :---: | :--- |
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| `head-image` | Head container image reference to scan (e.g. `registry.example.com/repo:git-sha`) | **Yes** | — |
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| `target-image` | Target baseline container image reference to compare against (e.g. `registry.example.com/repo:latest`) | **Yes** | — |
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| `target-branch` | Target branch name for report headings | No | `main` |
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| `trivy-version` | Trivy version to install and verify | No | `0.74.0` |
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| `output-delta` | Output path for the CVE delta Markdown report | No | `cve-delta.md` |
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| `output-summary` | Output path for the full vulnerability Markdown summary | No | `cve-summary.md` |
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| `write-summary` | Whether to append the generated reports to the job summary (`$GITHUB_STEP_SUMMARY`) | No | `true` |
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---
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## 📤 Outputs
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| Output | Description |
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| :--- | :--- |
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| `delta-report` | Path to the generated CVE delta Markdown report |
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| `summary-report` | Path to the full vulnerability Markdown summary report |
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---
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## 🚀 Usage Example
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```yaml
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jobs:
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build-and-scan:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout repository
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uses: actions/checkout@v4
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- name: Build and Push Head Container Image
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uses: docker/build-push-action@v5
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with:
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context: .
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push: true
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sbom: true
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platforms: linux/amd64,linux/arm64
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tags: registry.example.com/my-app:git-${{ github.sha }}
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- name: Compare Vulnerabilities (Head vs Target)
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uses: https://git.horstenkamp.eu/Philipp/cve-differential.git@main
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with:
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head-image: registry.example.com/my-app:git-${{ github.sha }}
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target-image: registry.example.com/my-app:latest
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target-branch: ${{ github.base_ref || 'main' }}
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```
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---
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## 📄 License
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MIT
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