GitHub Actions Injection Scanner
Tests for injection vulnerabilities in GitHub Actions workflows.
What is GitHub Actions Injection?
GitHub Actions Injection specifically targets GitHub's CI/CD platform where workflow files use expression syntax like ${{ github.event.issue.title }}. If this data flows to shell commands unsanitized, attackers who can create issues, PRs, or trigger workflows can inject commands executed in the workflow runner.
Why is This Important?
GitHub Actions often have access to GITHUB_TOKEN, repository secrets, and deployment capabilities. Thousands of public and private repositories have vulnerable workflows. Exploitation can lead to secret theft, code modification, and supply chain compromise affecting downstream users.
How It Works
1. Attack Surface Mapping
Identifies complex attack vectors including race conditions, desync points, and logic flaws in your application.
2. Advanced Exploitation
Executes sophisticated attack techniques that bypass traditional security controls and detection mechanisms.
3. Impact Assessment
Demonstrates real-world impact with detailed exploitation chains and business risk analysis.
Key Capabilities
Expert-level security testing for sophisticated vulnerabilities that evade traditional scanning tools.
- Race condition and timing attack detection
- Request smuggling and desync analysis
- Business logic flaw identification
- Chained exploit development
- Protocol-level vulnerability testing
Frequently Asked Questions
Which GitHub contexts are injectable?
Dangerous contexts include: github.event.issue.title/body, github.event.pull_request.title/body, github.event.comment.body, github.head_ref (branch name), commit messages, and any user-controllable data from events that trigger workflows.
What makes an Action vulnerable?
Vulnerable patterns: run: echo '${{ github.event.issue.title }}' (shell injection), run: | git checkout ${{ github.head_ref }} (command injection). Safe: using inputs that GitHub sanitizes, environment variables, or actions that don't pass to shell.
How do I find these vulnerabilities?
Detection: search workflow files for ${{ github.event.* }} in run: blocks, audit all user-controllable inputs, use tools like actionlint for static analysis, and check for expression injection in action inputs that eventually reach shells.
How do I fix GitHub Actions injection?
Fixes: use intermediate environment variables (env: TITLE: ${{ github.event.issue.title }} then $TITLE in shell), use actions instead of inline shell, validate input format, avoid processing untrusted data in shell context, and use actions/github-script for safe JavaScript execution.
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