mead.pl in fml 4.0.3 allows local users to overwrite arbitrary files via a symlink attack on the /tmp/debugbuf temporary file.
https://bugs.gentoo.org/show_bug.cgi?id=235770
http://www.securityfocus.com/bid/30903
http://www.openwall.com/lists/oss-security/2008/10/30/2
http://uvw.ru/report.lenny.txt