MT.1042: Restrict dial-in users from bypassing a meeting lobby
| ID | MT.1042 |
| Severity | Medium |
| Suite | Mito |
| Product | Teams |
| Feature | Meetings |
| Security area | External access and sharing |
| Resource type | Tenant |
| User impact of fixing | Low |
| Effort to fix | Low |
| Framework controls | nist-800-53-r5:AC-3 Access Enforcement |
| Reads from | Microsoft Teams |
What this checks and how to fix it
Section titled “What this checks and how to fix it”Dial-in users should not be able to bypass the meeting lobby.
Dial-in users aren’t authenticated though the Teams app. Increase the security of your meetings by preventing these unknown users from bypassing the lobby and immediately joining the meeting.
This test checks the AllowPSTNUsersToBypassLobby setting of the Global (Org-wide default) Teams meeting policy.
Remediation action
Section titled “Remediation action”- Open Meeting policies in the Teams admin center.
- Select the Global (Org-wide default) policy.
- Set People dialing in can bypass the lobby to Off.
- Select Save.
Or with PowerShell: Set-CsTeamsMeetingPolicy -Identity Global -AllowPSTNUsersToBypassLobby $false
Related links
Section titled “Related links”Mito check. Author: weyCC81; contributors: merill, svrooij. Open-source licences.
Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).
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