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 METHODNEITHER IOCTLs to the \\.\hgfs device, which allows guest OS users to modify arbitrary memory locations in guest kernel memory and gain privileges.

Double free vulnerability in VMware ESX Server 3.0.0 and 3.0.1 allows attackers to cause a denial of service (crash), obtain sensitive information, or possibly execute arbitrary code via unspecified vectors.

Buffer overflow in VMware ESX Server 3.0.0 and 3.0.1 might allow attackers to gain privileges or cause a denial of service (application crash) via unspecified vectors.