I picked this one up on Twitter and Secunia. Another reason to to upgrade to VC 2.5 U4
VMware Virtual Infrastructure Client Password Disclosure Weakness
Exposure of sensitive information
A weakness has been reported in VMware Virtual Infrastructure Client, which can be exploited by malicious, local users to disclose sensitive information.
The weakness is caused due to the application improperly storing passwords in memory. This can be exploited to potentially disclose the VirtualCenter Server password by reading the memory of the client process.
Update VirtualCenter, ESX, or ESXi to a fixed version, and install the included client.
Update to version 2.5 Update 4.
Apply patch ESXe350-200903201-O-UG (also included in ESXi 3.5 Update 4).
Apply patch ESX350-200903201-UG (also included in ESX 3.5 Update 4).
Provided and/or discovered by:
The vendor credits Craig Marshall.