The Linux Security Auditing Tool (LSAT) allows local users to overwrite arbitrary files via a symlink attack on temporary files, as demonstrated using /tmp/lsat1.lsat.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33057
http://www.securityfocus.com/bid/23014
http://security.gentoo.org/glsa/glsa-200703-20.xml