CVE-2020-14367

Public on 2020-09-03
Modified on 2021-01-07
Description
A flaw was found in chrony when creating the PID file under the /var/run/chrony folder. The file is created during chronyd startup while still running as the root user, and when it's opened for writing, chronyd does not check for an existing symbolic link with the same file name. This flaw allows an attacker with privileged access to create a symlink with the default PID file name pointing to any destination file in the system, resulting in data loss and a denial of service due to the path traversal.
Severity
Medium
CVSS v3 Base Score
5.1
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 chrony 2021-01-05 23:34 ALAS2-2021-1575
Amazon Linux 1 chrony 2020-09-03 22:01 ALAS-2020-1431

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.1 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L
NVD CVSSv2 3.6 AV:L/AC:L/Au:N/C:N/I:P/A:P
NVD CVSSv3 6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H