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VuXML IDDescription
719f06af-e45e-11ea-95a1-c3b8167b8026chrony <= 3.5.1 data corruption through symlink vulnerability writing the pidfile

Miroslav Lichvar reports:

chrony-3.5.1 [...] fixes a security issue in writing of the pidfile.

When chronyd is configured to save the pidfile in a directory where the chrony user has write permissions (e.g. /var/run/chrony - the default since chrony-3.4), an attacker that compromised the chrony user account could create a symbolic link at the location of the pidfile to make chronyd starting with root privileges follow the symlink and write its process ID to a file for which the chrony user doesn't have write permissions, causing a denial of service, or data loss.

This issue was reported by Matthias Gerstner of SUSE.


Discovery 2020-08-06
Entry 2020-08-22
chrony
< 3.5.1

https://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2020/08/msg00000.html
CVE-2020-14367