CVE-2021-27851— Local privilege escalation in GNU Guix via guix-daemon and '--keep-failed'
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I. Basic Information for CVE-2021-27851
Vulnerability Information
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Vulnerability Title
Local privilege escalation in GNU Guix via guix-daemon and '--keep-failed'
Source: NVD (National Vulnerability Database)
Vulnerability Description
A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’. It affects multi-user setups in which ’guix-daemon’ runs locally. The attack consists in having an unprivileged user spawn a build process, for instance with `guix build`, that makes its build directory world-writable. The user then creates a hardlink to a root-owned file such as /etc/shadow in that build directory. If the user passed the --keep-failed option and the build eventually fails, the daemon changes ownership of the whole build tree, including the hardlink, to the user. At that point, the user has write access to the target file. Versions after and including v0.11.0-3298-g2608e40988, and versions prior to v1.2.0-75109-g94f0312546 are vulnerable.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
权限、特权和访问控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
GNU Guix 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU Guix是GNU社区的一款开源的、跨平台程序包管理器。 GNU guix-daemon 存在后置链接漏洞，该漏洞允许让一个没有特权的用户生成一个构建进程。
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 |
|---|---|---|---|---|
| GNU Guix | guix-daemon | v0.11.0-3298-g2608e40988 ~ unspecified | - |
II. Public POCs for CVE-2021-27851
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IV. Related Vulnerabilities
V. Comments for CVE-2021-27851
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