The screensharing feature in the Admin application in Apple Xsan before 2.2 places a cleartext username and password in a URL within an error dialog, which allows physically proximate attackers to obtain credentials by reading this dialog.
https://exchange.xforce.ibmcloud.com/vulnerabilities/53232
http://www.vupen.com/english/advisories/2009/2644
http://www.securitytracker.com/id?1022904
http://www.securityfocus.com/bid/36385
http://support.apple.com/kb/HT3797
http://secunia.com/advisories/36673
http://lists.apple.com/archives/security-announce/2009/Sep/msg00005.html