Access to need-to-know information must be restricted to an authorized community of interest.

Documentable No

Rule ID SV-243481r959010_rule

CCI References

CCI-000366

Discussion

Because trust relationships effectively eliminate a level of authentication in the trusting domain or forest, they represent less stringent access control at the domain or forest level in which the resource resides. To mitigate this risk, trust relationships must be documented so that they can be readily verified during periodic inspections designed to validate only approved trusts are configured in AD.

Check Procedure

1. Before performing this check, perform V-243494, which validates the trusts within the documentation are current within AD.

2. Obtain documentation of the site's approved trusts from the site representative.  

3. For each of the identified trusts, verify the documentation includes a justification or explanation of the need-to-know basis of the trust. 

4. If the need for the trust is not documented, this is a finding.

Fix Action

Delete the unneeded trust relationship or document the access requirement or mission need for the trust.