postinst in twiki 4.1.2 allows local users to overwrite arbitrary files via a symlink attack on the /tmp/twiki temporary file. NOTE: the vendor disputes this vulnerability, stating "this bug is invalid.Referenceshttp://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494648http://www.openwall.com/lists/oss-security/2008/10/30/2https://bugs.gentoo.org/show_bug.cgi?id=235770https://bugs.gentoo.org/show_bug.cgi?id=235802
