CVE-2021-27851

CVE-2021-27851 · Local privilege escalation in GNU Guix via guix-daemon and '--keep-failed'

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

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.

CVSS 5.5 · Moyenne · EPSS 0,3% · Correctif disponible

Publication

2021-04-26T15:35:28.989Z

Mise à jour

2024-09-17T02:11:05.201Z

Pile logicielle: system

Vérifiez votre serveur →