STIGQter STIGQter: STIG Summary: Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 24 Jan 2020: The Exchange Sender filter must block unaccepted domains.

DISA Rule

SV-95261r2_rule

Vulnerability Number

V-80551

Group Title

SRG-APP-000261

Rule Version

EX16-ED-000360

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Update the EDSP to reflect the unaccepted domains that are to be blocked.

Open the Exchange Management Shell and enter the following command:

For BlockedDomains:

Set-SenderFilterConfig -BlockedDomains <BlockedDomain>

Repeat the procedure for each domain that is to be blocked.

or

For BlockedDomainsAndSubdomains:

Set-SenderFilterConfig -BlockedDomainsAndSubdomains <BlockedDomainAndSubdomain>

Repeat the procedure for each domain and all of its subdomains that are to be blocked.

Check Contents

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Review the Email Domain Security Plan (EDSP).

Determine the unaccepted domains that are to be blocked.

Open the Exchange Management Shell and enter the following command:

Get-SenderFilterConfig | Select Name, BlockedDomains, BlockedDomainsAndSubdomains

If the value for "BlockedDomains" or "BlockedDomainsAndSubdomains" does not reflect the list of accepted domains, this is a finding.

Vulnerability Number

V-80551

Documentable

False

Rule Version

EX16-ED-000360

Severity Override Guidance

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Review the Email Domain Security Plan (EDSP).

Determine the unaccepted domains that are to be blocked.

Open the Exchange Management Shell and enter the following command:

Get-SenderFilterConfig | Select Name, BlockedDomains, BlockedDomainsAndSubdomains

If the value for "BlockedDomains" or "BlockedDomainsAndSubdomains" does not reflect the list of accepted domains, this is a finding.

Check Content Reference

M

Target Key

3353

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