Overview
  1. 03.01: Access Control
  2. 03.02: Awareness and Training
  3. 03.03: Audit and Accountability
  4. 03.04: Configuration Management
  5. 03.05: Identification and Authentication
  6. 03.06: Incident Response
  7. 03.07: Maintenance
  8. 03.08: Media Protection
  9. 03.09: Personnel Security
  10. 03.10: Physical Protection
  11. 03.11: Risk Assessment
  12. 03.12: Security Assessment
  13. 03.13: System and Communications Protection
  14. 03.14: System and Information Integrity

Security Requirements for 03.13.14 Voice over Internet Protocol

VoIP has different requirements, features, functionality, availability, and service limitations when compared with the Plain Old Telephone Service (POTS) (i.e., the standard telephone service). In contrast, other telephone services are based on high-speed, digital communications lines, such as Integrated Services Digital Network (ISDN) and Fiber Distributed Data Interface (FDDI). The main distinctions between POTS and non-POTS services are speed and bandwidth. To address the threats associated with VoIP, usage restrictions and implementation guidelines are based on the potential for the VoIP technology to cause damage to the system if it is used maliciously. Threats to VoIP are similar to those inherent with any Internet-based application.[SP 800-58] provides guidance on Voice Over IP Systems.

Assessment GuidanceExamine 0/10

How an assessor determines this requirement is met. Source: CMMC Assessment Guide – Level 2, Version 2.13 (NIST SP 800-171 Rev. 2).

Discussion

Controlling VoIP technologies starts with establishing guidelines and enforcing the appropriate usage that is described in organizational policies. Monitoring should include the users’ activity for anything other than what is permitted and authorized and detection of insecure or unauthorized use of the VoIP technology. Security concerns for VoIP include eavesdropping on calls and using ID spoofing to impersonate trusted individuals. Selecting a solution that can encrypt VoIP traffic is helpful in maintaining the confidentiality and integrity of the voice data.

Examples

  1. Example 1

    You are a system administrator responsible for the VoIP system. You configure VoIP for new users after being notified that they have signed the Acceptable Use Policy for VoIP technology [a]. You verify that the VoIP solution is configured to use encryption and have enabled requirements for passwords on voice mailboxes and on phone extension management. You require phone system administrators to log in using multifactor authentication when managing the system [a]. You add the VoIP software to the list of applications that are patched monthly as needed [a, b]. Finally, you configure the VoIP system to send logs to your log aggregator so that they can be correlated with those from other systems and examined for signs of suspicious activity [b].

Assessment Methods

Examine
The process of reviewing, inspecting, observing, studying, or analyzing assessment objects (e.g., policies, procedures, plans, system designs, mechanisms) to facilitate understanding, achieve clarification, or obtain evidence.Example: An assessor reads the access control policy and inspects system configuration settings to confirm they match.

Not all of the evidence listed is required to meet this requirement — check the items your organization has collected.

Interview
The process of holding discussions with individuals or groups within an organization to facilitate understanding, achieve clarification, or identify the location of evidence.Example: An assessor asks a system administrator to describe how user accounts are approved, reviewed, and disabled.
  • System or network administrators
  • Personnel with information security responsibilities
  • Personnel with responsibilities for managing VoIP
Test
The process of exercising assessment objects (e.g., activities, mechanisms) under specified conditions to compare actual behavior with expected behavior.Example: An assessor attempts to sign in with a disabled account to confirm that access is denied.
  • Organizational process for authorizing, monitoring, and controlling VoIP
  • Mechanisms supporting or implementing authorizing, monitoring, and controlling VoIP

Potential Assessment Considerations

  • Are VoIP technologies (e.g., approved and managed products or solutions) that may or may not be used in the system defined [a]?
  • Is monitoring for unapproved VoIP technologies or unapproved use of the allowed VoIP solutions employed [b]?

Key References

NIST SP 800-171 Rev. 2 3.13.14

Evidence

  1. 03.13.14.a

    Use of voice over internet protocol (voip) technologies is controlled

  1. 03.13.14.b

    Use of voice over internet protocol (voip) technologies is monitored