Assessment Objective

Determine if:

• SC-07(04)(a) a managed interface is implemented for each external telecommunication service;
• SC-07(04)(b) a traffic flow policy is established for each managed interface;
• SC-07(04)(c)
  • SC-07(04)(c)[01] the confidentiality of the information being transmitted across each interface is protected;
  • SC-07(04)(c)[02] the integrity of the information being transmitted across each interface is protected;
• SC-07(04)(d) each exception to the traffic flow policy is documented with a supporting mission or business need and duration of that need;
• SC-07(04)(e)
  • SC-07(04)(e)[01] exceptions to the traffic flow policy are reviewed [Assignment: frequency];
  • SC-07(04)(e)[02] exceptions to the traffic flow policy that are no longer supported by an explicit mission or business need are removed;
• SC-07(04)(f) unauthorized exchanges of control plan traffic with external networks are prevented;
• SC-07(04)(g) information is published to enable remote networks to detect unauthorized control plane traffic from internal networks;
• SC-07(04)(h) unauthorized control plane traffic is filtered from external networks.

Assessment Methods

Examine

• System and communications protection policy
• traffic flow policy
• information flow control policy
• procedures addressing boundary protection
• system security architecture
• system design documentation
• boundary protection hardware and software
• system architecture and configuration documentation
• system configuration settings and associated documentation
• records of traffic flow policy exceptions
• system audit records
• system security plan
• other relevant documents or records

Interview

• System/network administrators
• organizational personnel with information security responsibilities
• organizational personnel with boundary protection responsibilities

Test

• Organizational processes for documenting and reviewing exceptions to the traffic flow policy
• organizational processes for removing exceptions to the traffic flow policy
• mechanisms implementing boundary protection capabilities
• managed interfaces implementing traffic flow policy

Verknüpfte Vorgänge

• NIST -

  https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final