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Assessment Title
Rule Text
All port groups on standard switches must be configured to reject forged transmits.
Description
Discussion Text
If the virtual machine (VM) operating system changes the Media Access Control (MAC) address, the operating system can send frames with an impersonated source MAC address at any time. This allows an operating system to stage malicious attacks on the devices in a network by impersonating a network adaptor authorized by the receiving network.
This means the virtual switch does not compare the source and effective MAC addresses.
To protect against MAC address impersonation, all virtual switches must have forged transmissions set to reject. Reject Forged Transmit can be set at the vSwitch and/or the Portgroup level. Switch-level settings can be overridden at the Portgroup level.
This means the virtual switch does not compare the source and effective MAC addresses.
To protect against MAC address impersonation, all virtual switches must have forged transmissions set to reject. Reject Forged Transmit can be set at the vSwitch and/or the Portgroup level. Switch-level settings can be overridden at the Portgroup level.
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