CVE-2021-27851
Guix Daemon Local Privilege Escalation Hardlink Manipulation
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.
INFO
Published Date :
April 26, 2021, 4:15 p.m.
Last Modified :
July 29, 2022, 4:34 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-27851.
| URL | Resource |
|---|---|
| https://bugs.gnu.org/47229 | Issue Tracking Mailing List Patch Vendor Advisory |
| https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/ | Patch Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-27851 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-27851 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Jul. 29, 2022
Action Type Old Value New Value Removed CWE NIST CWE-269 Added CWE NIST CWE-59 -
Initial Analysis by [email protected]
May. 07, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://bugs.gnu.org/47229 No Types Assigned https://bugs.gnu.org/47229 Issue Tracking, Mailing List, Patch, Vendor Advisory Changed Reference Type https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/ No Types Assigned https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/ Patch, Vendor Advisory Added CWE NIST CWE-269 Added CPE Configuration OR *cpe:2.3:a:gnu:guix:*:*:*:*:*:*:*:* versions from (including) 0.11.0 up to (excluding) 1.2.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-27851 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-27851
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.05635
percentile