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TITLE:
Vixie Cron "do_command.c" setuid Security Issue

SECUNIA ADVISORY ID:
SA20380

VERIFY ADVISORY:
http://secunia.com/advisories/20380/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
Vixie Cron 4.x
http://secunia.com/product/10269/

DESCRIPTION:
Roman Veretelnikov has reported a security issue in Vixie Cron, which
potentially can be exploited by malicious, local users to perform
certain actions with escalated privileges.

The security issue is caused due to missing checks for whether the
"setuid()" call has succeeded before running a job submitted by a
user. This may cause the user's job to run with root privileges if
the "setuid()" fails due to e.g. PAM failures or resource limits.

The security issue has been reported in version 4.1. Other versions
may also be affected.

SOLUTION:
Restrict the use of cron to trusted users only.

Some Linux vendors have issued fixed packages.

PROVIDED AND/OR DISCOVERED BY:
Roman Veretelnikov

ORIGINAL ADVISORY:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=178431
http://bugs.gentoo.org/show_bug.cgi?id=134194

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