Thibault Godouet Fcron Symbolic Link Vulnerability

FCron is an implementation of the popular UNIX 'cron' utility that runs user-specified programs at periodic scheduled times.

fcron is vulnerable to symbolic link attacks.

It is possible for an attacker to anticipate the expected name of an fcron tempfile. Attackers can create a symbolic link with an anticipated filename pointing to files on the system writable by the fcron group. This could allow an attacker to corrupt another user's crontab file, interfering with scheduled events and potentially creating a denial of service.

In addition, the ability to cause deletion of user crontabs has been demonstrated by the discoverer.


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