fwb_install in fwbuilder 2.1.19 allows local users to overwrite arbitrary files via a symlink attack on a /tmp/ssh-agent.##### temporary file.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2008-4935
https://bugs.gentoo.org/show_bug.cgi?id=235809
https://bugs.gentoo.org/show_bug.cgi?id=235770
http://www.openwall.com/lists/oss-security/2008/10/30/2