Format string vulnerability in Screen Sharing Server in Apple Mac OS X before 10.9 and Apple Remote Desktop before 3.5.4 allows remote attackers to execute arbitrary code via format string specifiers in a VNC username.

Apple Remote Desktop before 3.7 does not properly use server authentication-type information during decisions about whether to present an unencrypted-connection warning message, which allows remote attackers to obtain sensitive information in opportunistic circumstances by sniffing the network during an unintended cleartext VNC session.

Apple Remote Desktop (ARD) for Mac OS X 10.2.8 and later does not drop privileges on the remote machine while installing certain applications, which allows local users to bypass authentication and gain privileges by selecting the icon during installation. NOTE: it could be argued that the issue is not in Remote Desktop itself, but in applications that are installed while using it.