Directory traversal vulnerability in the Shared Folders feature for VMware Workstation before 5.5.4, when a folder is shared, allows users on the guest system to write to arbitrary files on the host system via the "Backdoor I/O Port" interface.
http://www.vupen.com/english/advisories/2007/1592
http://www.vmware.com/support/ws55/doc/releasenotes_ws55.html#554
http://www.securitytracker.com/id?1017980
http://www.securityfocus.com/bid/23721
http://www.securityfocus.com/archive/1/469011/30/6510/threaded
http://www.securityfocus.com/archive/1/467936/30/6690/threaded
http://secunia.com/advisories/25079
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=521