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In guix-daemon in GNU Guix before 1618ca7, a content-addressed-mirrors file can be written to create a setuid program that allows a regular user to gain the privileges of the build user that runs it (even after the build has ended).

CVE-2025-59378 is a medium-severity vulnerability affecting the guix-daemon component of GNU Guix, a functional package management tool and distribution. The flaw arises from an incorrect resource transfer between security spheres (CWE-669), specifically involving the handling of the content-addressed-mirrors file. An attacker with regular user privileges can exploit this vulnerability by writing to this file to create a setuid program. This crafted setuid program runs with the privileges of the build user, which is a higher-privileged account responsible for building packages. Notably, the elevated privileges persist even after the build process has ended, allowing the attacker to maintain unauthorized access at a higher privilege level. The vulnerability does not require user interaction or prior authentication, but it does require local access since the attack vector involves writing to a file managed by guix-daemon. The CVSS 3.1 base score is 5.7, reflecting a medium severity with low attack vector scope (local), low attack complexity, no privileges required, no user interaction, and a scope change due to privilege escalation. The impact includes limited confidentiality and integrity loss but no availability impact. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. This vulnerability highlights a critical mismanagement of privilege boundaries within the guix-daemon, potentially allowing unauthorized privilege escalation on affected systems.

Detailed information about CVE-2025-59378: CWE-669 Incorrect Resource Transfer Between Spheres in GNU Guix affecting GNU Guix. Get real-time updates, technical 

CVE-2025-59378: CWE-669 Incorrect Resource Transfer Between Spheres in GNU Guix - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-59378: CWE-669 Incorrect Resource Transfer Between Spheres in GNU Guix

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