Race condition in the runScript function in Tunnelblick 3.3beta20 and earlier allows local users to gain privileges by replacing a script file.
http://www.openwall.com/lists/oss-security/2012/08/14/1
http://git.zx2c4.com/Pwnnel-Blicker/tree/pwnnel-blicker.c
http://code.google.com/p/tunnelblick/issues/detail?id=212
http://archives.neohapsis.com/archives/fulldisclosure/2012-08/0122.html