Title: Thibault Godouet Fcron Symbolic Link Vulnerability
Severity: MODERATE
Description:
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. If an attacker creates an 'rm.[username]' file in the fcron spool directory, fcrond will delete the target user's crontab.
Affected Products:
- Thibault Godouet FCron 1.0.0
- Thibault Godouet FCron 1.0.1
- Thibault Godouet FCron 1.0.2
- Thibault Godouet FCron 1.0.3
- Thibault Godouet FCron 1.1.0.0
References:
- Thibault Godouet: FCron homepage
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
