Rapid7 Vulnerability & Exploit Database

Amazon Linux AMI 2: CVE-2020-14367: Security patch for chrony (ALAS-2021-1575)

Back to Search

Amazon Linux AMI 2: CVE-2020-14367: Security patch for chrony (ALAS-2021-1575)

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:N/I:P/A:P)
Published
08/24/2020
Created
01/09/2021
Added
01/08/2021
Modified
01/08/2021

Description

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.

Solution(s)

  • amazon-linux-ami-2-upgrade-chrony
  • amazon-linux-ami-2-upgrade-chrony-debuginfo

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;