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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Tuxfamily ≫ Chrony Version < 3.5.1
Fedoraproject ≫ Fedora Version 32
Canonical ≫ Ubuntu Linux Version 18.04 SwEdition lts
Canonical ≫ Ubuntu Linux Version 20.04 SwEdition lts
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.49% 0.378
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 6 0.8 5.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
NIST 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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6WKABKNLCSC3MACCWU6OM2YGWVWFWFMU/
https://security.gentoo.org/glsa/202008-23
Third Party Advisory
https://usn.ubuntu.com/4475-1/
Third Party Advisory