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Tools / Microsoft Threat Modeling Tool (TMT) Interview questions

Why does TMT generate more threats for data flows crossing trust boundaries?

Crossing a trust boundary means data is moving from one trust context into another where the receiving side has no inherent way to vouch for the sender's identity or the integrity of the environment it came from.

Template rules specifically check the "crosses trust boundary" flag on a data flow, and where it's set, they add threats that wouldn't otherwise apply within a single trusted zone - things like sniffing on an untrusted network segment, or weak authentication between two differently-trusted parties. A flow that never leaves one trust context skips these, since the assumption is that everything inside a single boundary already shares a baseline of trust.

Crossing a trust boundary increases risk because the receiving side:
A flow that stays entirely within one trust boundary:

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