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

From Keyboard Video and Mouse Switch STIG

Part of A/B Switch cascaded differing classification

Associated with IA controls: DCBP-1

SV-6983r2_rule A/B switches must not be cascaded when connected to devices or ISs which are at different classification levels.

Vulnerability discussion

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.

Check content

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

Remove the cascaded A/B switches that are connected to ISs of different classification levels.

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