The DBus configuration file for Wicd before 1.5.9 allows arbitrary users to own org.wicd.daemon, which allows local users to receive messages that were intended for the Wicd daemon, possibly including credentials.
http://www.openwall.com/lists/oss-security/2009/02/06/4
http://sourceforge.net/project/shownotes.php?group_id=194573&release_id=659059
http://security.gentoo.org/glsa/glsa-200904-12.xml
http://secunia.com/advisories/34685
http://secunia.com/advisories/33870
http://bazaar.launchpad.net/~wicd-devel/wicd/trunk/revision/222