cronic before 3 allows local users to write to arbitrary files via a symlink attack on a (1) cronic.out.$$, (2) cronic.err.$$, or (3) cronic.trace.$$ file in /tmp.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820331
http://www.openwall.com/lists/oss-security/2016/04/10/2
http://www.openwall.com/lists/oss-security/2016/04/09/4
http://lists.opensuse.org/opensuse-updates/2016-07/msg00013.html