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CVE-2025-32955— Harden-Runner Evasion of 'disable-sudo' policy

Quick assessment

Affected
step-security harden-runner
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Harden-Runner是StepSecurity开源的一个程序。为 GitHub 托管和自托管的跑步者提供网络出口过滤和运行时安全。 Harden-Runner 0.12.0至2.12.0之前版本存在安全漏洞，该漏洞源于disable-sudo策略可能被绕过，导致攻击者通过docker组恢复root访问权限。

CVSS 6.0 · Medium EPSS 0.23% · P12
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I. Basic Information for CVE-2025-32955

Vulnerability Information
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Vulnerability Title
Harden-Runner Evasion of 'disable-sudo' policy
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权链锁
Source: CVE Program / CVE List V5
Vulnerability Title
Harden-Runner 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Harden-Runner是StepSecurity开源的一个程序。为 GitHub 托管和自托管的跑步者提供网络出口过滤和运行时安全。 Harden-Runner 0.12.0至2.12.0之前版本存在安全漏洞，该漏洞源于disable-sudo策略可能被绕过，导致攻击者通过docker组恢复root访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
step-security harden-runner >= 0.12.0, < 2.12.0 -

II. Public POCs for CVE-2025-32955

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III. Intelligence Information for CVE-2025-32955

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Patches & Fixes for CVE-2025-32955 (2)

Vendor Advisories for CVE-2025-32955 (1)

IV. Related Vulnerabilities

Same product: harden-runner
Same vendor: step-security
Same weakness: CWE-268

V. Comments for CVE-2025-32955

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