The Exchange Block List service provider must be identified.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69879	EX13-EG-000210	SV-84501r2_rule		Medium

Description
Block List filtering is a sanitization process performed on email messages prior to their arrival at the destination mailbox. By performing this process at the email perimeter, threats can be eliminated outside the enclave, where there is less risk they can do harm. Block List services (sometimes called Reputation Data services) are fee-based data providers that collect the IP addresses of known spammers and other malware purveyors. Block List service subscribers benefit from more effective spam elimination. (Spam is estimated to compose up to 90 percent of inbound mail volume.) Failure to specify a Block List provider risks that manual email administration effort would be needed to maintain and update larger Block Lists than a single email site administrator could conveniently or accurately maintain. The Block List service vendor provides a value for this field, usually the Domain Name System (DNS) suffix for its domain.

Description

Block List filtering is a sanitization process performed on email messages prior to their arrival at the destination mailbox. By performing this process at the email perimeter, threats can be eliminated outside the enclave, where there is less risk they can do harm. Block List services (sometimes called Reputation Data services) are fee-based data providers that collect the IP addresses of known spammers and other malware purveyors. Block List service subscribers benefit from more effective spam elimination. (Spam is estimated to compose up to 90 percent of inbound mail volume.) Failure to specify a Block List provider risks that manual email administration effort would be needed to maintain and update larger Block Lists than a single email site administrator could conveniently or accurately maintain. The Block List service vendor provides a value for this field, usually the Domain Name System (DNS) suffix for its domain.

STIG	Date
MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide	2019-03-11

Details

Check Text ( C-70347r2_chk )
If not using a service provider, this requirement is not applicable. This requirement is NA for SIPR enclaves. Review the Email Domain Security Plan (EDSP). Determine the name and information for the Block List provider. Open the Exchange Management Shell and enter the following command: Get-IPBlockListProvider \| Select Name, Identity, LookupDomain If the values for Name, GUID, and LookupDomain are not configured, this is a finding.

Check Text ( C-70347r2_chk )

If not using a service provider, this requirement is not applicable.

This requirement is NA for SIPR enclaves.

Review the Email Domain Security Plan (EDSP).

Determine the name and information for the Block List provider.

Open the Exchange Management Shell and enter the following command:

Get-IPBlockListProvider | Select Name, Identity, LookupDomain

If the values for Name, GUID, and LookupDomain are not configured, this is a finding.

Fix Text (F-76109r1_fix)
Update the EDSP. Open the Exchange Management Shell and enter the following command: Set-IPBlockListProvider -Name [Additional optional parameters as required by the service provider]