Improper Privilege Management Affecting guix package, versions <1.2.0-4
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Test your applications- Snyk ID SNYK-DEBIAN11-GUIX-1244684
- published 11 Apr 2021
- disclosed 26 Apr 2021
Introduced: 11 Apr 2021
CVE-2021-27851 Open this link in a new tabHow to fix?
Upgrade Debian:11 guix to version 1.2.0-4 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream guix package and not the guix package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
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.