Vulnerability · Published Apr 21, 2025 · Assigned by GitHub_M
CVE-2025-32955Harden-Runner Evasion of 'disable-sudo' policy
Medium 6.0
In plain English
A medium-severity privilege mismanagement in harden-runner from step-security. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Official description
Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. Versions from 0.12.0 to before 2.12.0 are vulnerable to `disable-sudo` bypass. Harden-Runner includes a policy option `disable-sudo` to prevent the GitHub Actions runner user from using sudo. This is implemented by removing the runner user from the sudoers file. However, this control can be bypassed as the runner user, being part of the docker group, can interact with the Docker daemon to launch privileged containers or access the host filesystem. This allows the attacker to regain root access or restore the sudoers file, effectively bypassing the restriction. This issue has been patched in version 2.12.0.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| step-security | harden-runner | >= 0.12.0, < 2.12.0 |
Weakness: CWE-268, CWE-269 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
References
- https://github.com/step-security/harden-runner/security/advisories/GHSA-mxr3-8whj-j74r x_refsource_CONFIRM
- https://github.com/step-security/harden-runner/commit/0634a2670c59f64b4a01f0f96f84700a4088b9f0 x_refsource_MISC
- https://github.com/step-security/harden-runner/releases/tag/v2.12.0 x_refsource_MISC