The extension mobility feature must only be enabled per user when specific security features are configured.

From Voice/Video over Internet Protocol (VVoIP) STIG

Part of VVoIP 1670

SV-23732r3_rule The extension mobility feature must only be enabled per user when specific security features are configured.

Vulnerability discussion

Extension mobility is a feature of a VVoIP system that permits a person to transfer their phone number extension and phone features (or configuration) to a phone that is not in their normal workspace. This is useful when a person is visiting a remote office away from their normal office and typically functions within an established enterprise wide VVoIP system where the system is designed as a contiguous system. In this case, the system is typically a single vendor solution. The system might be within one LAN/CAN may include multiple LAN/CANs at multiple interconnected sites. To activate this feature, the user approaches a phone that is not their regular phone and identifies themselves to the phone system via a username, password, pin, code, or some combination of these. Upon validation, the system configuration manager will configure the temporary phone to match the configuration of the user’s regular phone. Minimally, the phone number is transferred and possibly some or all of the user’s speed dial numbers and other personal preferences. This capability is dependant upon the capabilities of the temporary phone. Once activated the user’s inbound calls are directed to the temporary location. The user’s regular phone may or may not maintain its normal capabilities and also may also answer inbound calls.Extension mobility is similar to but not the same as forwarding ones calls. Forwarding is typically activated from the user’s normal phone or their user preferences configuration settings. Forwarding is therefore pre-set to a known location. Extension mobility is typically activated from the remote location and is activated upon arrival at that location. Extension mobility should be available only to those individuals that need to use the feature.

Check content

If the extension mobility feature of the VVoIP system cannot be configured per user or is globally disabled, this is not applicable. Interview the ISSO to validate compliance with the following requirement: Verify the configuration for the extension mobility feature is only available when enabled per user. Confirm the following specific security features are configured: - The feature is enabled/disabled on a per user basis. - Feature activation requires user authentication minimally using a user unique PIN (preferably including a unique user ID) - Feature is not activated using a common activation code, or feature button on the phone. - The user (or system administrator) can manually disable the feature at their discretion. - The user may have the capability to set duration when activating the feature. (Optional) - The feature automatically deactivates based on a period of inactivity or the time of day. If the extension mobility feature is enabled and does not meet the above specific security features, this is a finding.

Fix text

Configure the extension mobility feature only when enabled per user. Confirm the following specific security features are configured: - The feature is enabled/disabled on a per user basis. - Feature activation requires user authentication minimally using a user unique PIN (preferably including a unique user ID) - Feature is not activated using a common activation code, or feature button on the phone. - The user (or system administrator) can manually disable the feature at their discretion. - The user may have the capability to set duration when activating the feature. (Optional) - The feature automatically deactivates based on a period of inactivity or the time of day.

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