GitHub Actions Pwn Request Vulnerability
Detects a vulnerable GitHub Actions workflow configuration known as a "Pwn Request". This occurs when a workflow is triggered by `pull_request_target` but checks out and executes untrusted code from the head of the pull request (`${{ github.event.pull_request.head.sha }}`). This allows an attacker to run arbitrary code with the permissions of the target repository, including access to secrets. This pattern was actively exploited by the 'hackerbot-claw' campaign. This rule should be applied to files in the `.github/workflows/` directory.
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