A vulnerability has been found in fcron, allowing local attackers to conduct symlink attacks.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-process/fcron | * | < 3.0.5-r2 | >= 3.0.5-r2 |
fcron is a periodic command scheduler for Unix-based systems
The fcrontab function contains a race condition relating to symlinks.
A local attacker could perform symlink attacks to read arbitrary files with the privileges of the user running the application.
There is no known workaround at this time.
All fcron users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-process/fcron-3.0.5-r2"
Multiple vulnerabilities in Fcron can allow a local user to potentially cause a Denial of Service.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-process/fcron | * | <= 2.9.5 | >= 2.0.2 (revision), >= 2.9.5.1 |
Fcron is a command scheduler with extended capabilities over cron and anacron.
Due to design errors in the fcronsighup program, Fcron may allow a local user to bypass access restrictions (CAN-2004-1031), view the contents of root owned files (CAN-2004-1030), remove arbitrary files or create empty files (CAN-2004-1032), and send a SIGHUP to any process. A vulnerability also exists in fcrontab which may allow local users to view the contents of fcron.allow and fcron.deny (CAN-2004-1033).
A local attacker could exploit these vulnerabilities to perform a Denial of Service on the system running Fcron.
Make sure the fcronsighup and fcrontab binaries are only executable by trusted users.
All Fcron users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-process/fcron-2.0.2"