do_command.c in Vixie cron (vixie-cron) 4.1 does not check the return code of a setuid call, which might allow local users to gain root privileges if setuid fails in cases such as PAM failures or resource limits, as originally demonstrated by a program that exceeds the process limits as defined in /etc/security/limits.conf.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10213
https://exchange.xforce.ibmcloud.com/vulnerabilities/26691
http://www.vupen.com/english/advisories/2006/2075
http://www.securityfocus.com/bid/18108
http://www.securityfocus.com/archive/1/435033/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0539.html
http://www.novell.com/linux/security/advisories/2006-05-32.html
http://support.avaya.com/elmodocs2/security/ASA-2006-168.htm
http://securitytracker.com/id?1016480
http://security.gentoo.org/glsa/glsa-200606-07.xml
http://secunia.com/advisories/35318
http://secunia.com/advisories/21702
http://secunia.com/advisories/21032
http://secunia.com/advisories/20616
http://secunia.com/advisories/20388