HGFS.sys in the VMware Tools package in VMware Workstation 5.x before 5.5.6 build 80404, VMware Player before 1.0.6 build 80404, VMware ACE before 1.0.5 build 79846, VMware Server before 1.0.5 build 80187, and VMware ESX 2.5.4 through 3.0.2 does not properly validate arguments in user-mode METHOD_NEITHER IOCTLs to the \\.\hgfs device, which allows guest OS users to modify arbitrary memory locations in guest kernel memory and gain privileges.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5688
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5358
http://www.vupen.com/english/advisories/2008/1744
http://www.vmware.com/security/advisories/VMSA-2008-0009.html
http://www.securityfocus.com/archive/1/493172/100/0/threaded
http://www.securityfocus.com/archive/1/493148/100/0/threaded
http://www.securityfocus.com/archive/1/493080/100/0/threaded
http://securitytracker.com/id?1020197
http://securityreason.com/securityalert/3922
http://security.gentoo.org/glsa/glsa-201209-25.xml
http://secunia.com/advisories/30556
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=712