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Vixie Cron: Privilege Escalation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200606-07 / vixie-cron
Release Date June 09, 2006
Latest Revision June 09, 2006: 01
Impact high
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-process/vixie-cron < 4.1-r9 >= 4.1-r9 All supported architectures

Related bugreports: #134194


Vixie Cron allows local users to execute programs as root.

2.  Impact Information


Vixie Cron is a command scheduler with extended syntax over cron.


Roman Veretelnikov discovered that Vixie Cron fails to properly check whether it can drop privileges accordingly if setuid() in do_command.c fails due to a user exceeding assigned resource limits.


Local users can execute code with root privileges by deliberately exceeding their assigned resource limits and then starting a command through Vixie Cron. This requires resource limits to be in place on the machine.

3.  Resolution Information


There is no known workaround at this time.


All Vixie Cron users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-process/vixie-cron-4.1-r9"

4.  References


Page updated June 09, 2006

Summary: This is a Gentoo Linux Security Advisory

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