fcron: Information disclosure

Background

fcron is a periodic command scheduler for Unix-based systems

Description

The fcrontab function contains a race condition relating to symlinks.

Impact

A local attacker could perform symlink attacks to read arbitrary files with the privileges of the user running the application.

Workaround

There is no known workaround at this time.

Resolution

All fcron users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-process/fcron-3.0.5-r2"