A/B switches must not be cascaded when connected to devices or ISs which are at different classification levels.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-6761	KVM04.008.00	SV-6983r2_rule	DCBP-1	Low

Description
When A/B switches are cascaded it is difficult to verify the currently selected connection is the correct selection. When A/B switches are used with ISs of differing classification levels this can lead to the compromise of sensitive data. When A/B switches are attached to ISs of different classification levels the ISSO or SA will ensure that A/B switches are not cascaded.

STIG	Date
Keyboard Video and Mouse Switch STIG	2015-12-09

Details

Check Text ( C-2908r2_chk )
The reviewer will, for A/B switches which are connected to devices or ISs that are at different classification levels, view the A/B switches to verify the A/B switches are not cascaded. If the A/B switches are cascaded, this is a finding.

Fix Text (F-6414r1_fix)
Remove the cascaded A/B switches that are connected to ISs of different classification levels.