VShieldCheck in McAfee VirusScan for Mac (Virex) before 7.7 patch 1 allow local users to change permissions of arbitrary files via a symlink attack on /Library/Application Support/Virex/VShieldExclude.txt, as demonstrated by symlinking to the root crontab file to execute arbitrary commands.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32729
http://www.vupen.com/english/advisories/2007/0777
http://www.securitytracker.com/id?1017707
http://www.securityfocus.com/archive/1/461485/100/0/threaded