[Bug 212305] Security: possible to edit crontab of other user

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212305

            Bug ID: 212305
           Summary: Security: possible to edit crontab of other user
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: akuzik at gmail.com

Security bug allows to edit other users crontab

root# pw useradd -n www.promspecbud.com  -g nobody -s /bin/sh -d /tmp
root# pw useradd -n www.promspecbud.com.other -g nobody -s /bin/sh -d /tmp 
root# echo @daily doit baby > /tmp/test
root# crontab -u www.promspecbud.com.other /tmp/test
root# crontab -u www.promspecbud.com -l

=====output =====
@daily doit baby
=================

root#echo @daily doit baby one more time>> /tmp/test
root#sudo -u www.promspecbud.com.other crontab /tmp/test
root#sudo -u www.promspecbud.com crontab -l
=====output =====
@daily doit baby
@daily doit baby one more time
=================

root# uname -a
FreeBSD kuzik 10.3-RELEASE FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25 02:10:02
UTC 2016     root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

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