The (1) check_update.sh and (2) rkhunter script in Rootkit Hunter before 1.2.3-r1 create temporary files with predictable file names, which allows local users to overwrite arbitrary files via a symlink attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20279
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1273
http://www.securityfocus.com/bid/13399