Medium: chrony

Issue Overview:

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. (CVE-2020-14367)

Affected Packages:

chrony

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update chrony to update your system.

New Packages:

aarch64:  
    chrony-3.5.1-1.amzn2.0.1.aarch64  
    chrony-debuginfo-3.5.1-1.amzn2.0.1.aarch64  
  
i686:  
    chrony-3.5.1-1.amzn2.0.1.i686  
    chrony-debuginfo-3.5.1-1.amzn2.0.1.i686  
  
src:  
    chrony-3.5.1-1.amzn2.0.1.src  
  
x86_64:  
    chrony-3.5.1-1.amzn2.0.1.x86_64  
    chrony-debuginfo-3.5.1-1.amzn2.0.1.x86_64  

Additional References

Red Hat: CVE-2020-14367

Mitre: CVE-2020-14367