GitHub Actions Security Best Practices [cheat sheet included]

GitHub Actions, a popular CI/CD platform, offers automation for the development lifecycle but requires stringent security measures due to the incorporation of external code, which can introduce vulnerabilities. Key strategies for securing GitHub Actions include setting minimal credentials, such as using GITHUB_TOKEN with least privilege, and employing specific action version tags to avoid supply-chain attacks from third-party actions. It's crucial to avoid storing sensitive information in plaintext and to use GitHub Secrets instead, while also ensuring that any referenced values are controlled to mitigate the risk of malicious code injection. Additionally, caution is advised when using self-hosted runners, especially for public repositories, as they require rigorous security hardening, including ephemeral operations and robust monitoring. The article highlights the potential risks of the 'pull_request_target' event, which can inadvertently expose secrets if untrusted code is checked out, and recommends using OpenID Connect to securely connect workflows to cloud resources without long-lived secrets. These best practices are consolidated into a downloadable cheat sheet to assist developers in maintaining secure workflows.

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