![]() GitHub runner is an environment running this open-source code that connects to a personal account or an organization and listens to the workflow queue. Supporting automatic merges for PR created by external bots.Sending issues to ticket handling system (Jira/Monday/Asana/etc.).Running tests for forked pull requests.Scheduled tasks that scan vulnerabilities in code.Building the code into a container and uploading it to the chosen registry.Like every continuous integration system, its usages may vary. For example, the following workflow dictates that each repository push will run code that prints “Hello World!”. github/workflows path, and once certain events occur, it will run your jobs. Since then, GitHub Actions have become extremely popular mainly due to its marketplace, containing more than 11 thousand actions, and free hosted runners for public repositories.Īny repository on GitHub can add YAML files (called workflows) in the. In 2018, they announced that they are going in a different but related direction by launching GitHub Actions – a CI/CD platform allowing GitHub developers to automate development workflows easily. Describing possible mitigations for such vulnerabilities and best practices for developers and DevOps teams using GitHub Actions.įor most of its history, GitHub was all about storing source code.Diving into GitHub Actions internals to understand what malicious actors could achieve with code execution on the runners.Explaining GitHub Actions security concepts, including how you can leverage misconfiguration such as the ones we found into code execution.What is the GitHub Actions platform, and what makes it a powerful build system.Apart from reporting these vulnerabilities, we want to share with the community our journey through the research and elaborate on the following topics: Article OutlineĬycode is a leader in software supply chain security solutions, and it is our responsibility to increase the awareness and educate around security issues in code and build systems. Such vulnerabilities could also be found in private GitHub repositories. Note: These aren’t vulnerabilities in GitHub Actions infrastructure but in misusing workflows and not applying best practices. ![]() We didn’t find any signs of prior exploitation of the vulnerable workflows. We responsibly disclosed these vulnerabilities to the organizations and the maintainers, and they fixed them quickly. Summing up the users of these tools, these vulnerabilities can impact millions of potential victims.
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