Any enabled or connected device represents a potential attack channel. Users and processes without privileges on a virtual machine can connect or disconnect hardware devices, such as network adapters and CD-ROM drives. Attackers can use this capability to breach virtual machine security. Removing unnecessary hardware devices can help prevent attacks.
- Ensure that unauthorized devices are not connected and remove any unneeded or unused hardware devices.
- Disable unnecessary virtual devices from within a virtual machine.
- Ensure that no device is connected to a virtual machine if it is not required. Serial and parallel ports are rarely used for virtual machines in a data center, and CD/DVD drives are usually connected only temporarily during software installation.
- Log into a vCenter Server system using the vSphere Web Client.
- Right-click the virtual machine and click Edit Settings.
- Check each hardware device and ensure that you want it connected.
Include checks for the following devices:
- Floppy drives
- Serial ports
- Parallel ports
- USB controllers
- CD-ROM drives