cve/2023/CVE-2023-27581.md

### [CVE-2023-27581](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27581)
![](https://img.shields.io/static/v1?label=Product&message=github-slug-action&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3E%3D%204.0.0%2C%20%3C%204.4.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-77%3A%20Improper%20Neutralization%20of%20Special%20Elements%20used%20in%20a%20Command%20('Command%20Injection')&color=brighgreen)

### Description

github-slug-action is a GitHub Action to expose slug value of GitHub environment variables inside of one's GitHub workflow. Starting in version 4.0.0` and prior to version 4.4.1, this action uses the `github.head_ref` parameter in an insecure way. This vulnerability can be triggered by any user on GitHub on any workflow using the action on pull requests. They just need to create a pull request with a branch name, which can contain the attack payload. This can be used to execute code on the GitHub runners and to exfiltrate any secrets one uses in the CI pipeline. A patched action is available in version 4.4.1. No workaround is available.

### POC

#### Reference
- https://securitylab.github.com/research/github-actions-untrusted-input/

#### Github
No PoCs found on GitHub currently.