STIGQter: STIG Summary: Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 30 Jan 2025:

Exchange Simple Mail Transfer Protocol (SMTP) IP Allow List entries must be empty.

DISA Rule

SV-259623r961161_rule

Vulnerability Number

V-259623

Group Title

SRG-APP-000261

Rule Version

EX19-ED-000137

Severity

CAT II

CCI(s)

• CCI-001308 - Automatically update spam protection mechanisms on an organization-defined frequency.

Weight

10

Fix Recommendation

Update the EDSP to reflect the SMTP Allow List settings.

Open the Exchange Management Shell and enter the following command:

Note: Remove any value(s) that are not identified by the EDSP or have not obtained a signoff with risk acceptance.

Remove-IPAllowListEntry -Identity <IP Allow List entry ID>

Check Contents

Review the Email Domain Security Plan (EDSP).

Identify the SMTP Allow List settings.

Open the Exchange Management Shell and enter the following command:

Get-IPAllowListEntry | Format-List

If the result returns any values, this is a finding.

or

If the result returns any values but has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-259623

Documentable

False

Rule Version

EX19-ED-000137

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Identify the SMTP Allow List settings.

Open the Exchange Management Shell and enter the following command:

Get-IPAllowListEntry | Format-List

If the result returns any values, this is a finding.

or

If the result returns any values but has signoff and risk acceptance in the EDSP, this is not a finding.

Check Content Reference

M

Target Key

5579