6

CVE-2020-14367

A flaw was found in chrony versions before 3.5.1 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.

Data is provided by the National Vulnerability Database (NVD)
Tuxfamily ≫ Chrony Version < 3.5.1
Fedoraproject ≫ Fedora Version32
Canonical ≫ Ubuntu Linux Version18.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version20.04 SwEditionlts
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.26% 0.494
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 6 0.8 5.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
nvd@nist.gov 3.6 3.9 4.9
AV:L/AC:L/Au:N/C:N/I:P/A:P
CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

https://bugzilla.redhat.com/show_bug.cgi?id=1870298
Patch
Vendor Advisory
Issue Tracking
https://usn.ubuntu.com/4475-1/
Third Party Advisory