CVE-2021-27851
published 2021-04-26CVE-2021-27851: 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…
PriorityP427medium5.5CVSS 3.1
AVLACLPRLUINSUCNIHAN
EPSS
0.33%
25.5th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | guix | < guix 1.2.0-4 (bullseye) | guix 1.2.0-4 (bullseye) |
| gnu | guix | >= 0 < 1.2.0-4 | 1.2.0-4 |
| gnu | guix | >= 0.11.0 < 1.2.0 | 1.2.0 |
| gnu_guix | guix-daemon | >= unspecified < v1.2.0-75109-g94f0312546 | v1.2.0-75109-g94f0312546 |
| gnu_guix | guix-daemon | >= v0.11.0-3298-g2608e40988 < unspecified | unspecified |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
nvdv2.02.1LOWAV:L/AC:L/Au:N/C:N/I:P/A:N
osv5.5MEDIUM
vendor_debian5.5LOW
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Debian
CVE-2021-27851: guix - A security vulnerability that can lead to local privilege escalation has been fo...
vendor_debian·2021·CVSS 5.5
CVE-2021-27851 [MEDIUM] CVE-2021-27851: guix - A security vulnerability that can lead to local privilege escalation has been fo...
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.
Scope: local
bullseye: resolved (f
GHSA
GHSA-c5fp-qrw2-8x2w: A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’
ghsa_unreviewed·2022-05-24
CVE-2021-27851 [MEDIUM] CWE-269 GHSA-c5fp-qrw2-8x2w: A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’
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.
OSV
CVE-2021-27851: A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’
osv·2021-04-26·CVSS 5.5
CVE-2021-27851 [MEDIUM] CVE-2021-27851: A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2021-04-26
Published