Exchange must have antispam filtering enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-70039	EX13-MB-000250	SV-84661r1_rule		Medium

Description
Originators of spam messages are constantly changing their techniques in order to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A manual update procedure is labor intensive and does not scale well in an enterprise environment. This risk may be mitigated by using an automatic update capability. Spam protection mechanisms include, for example, signature definitions, rule sets, and algorithms. Exchange 2013 provides both antispam and antimalware protection out of the box. The Exchange 2013 antispam and antimalware product capabilities are limited but still provide some protection.

Description

Originators of spam messages are constantly changing their techniques in order to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A manual update procedure is labor intensive and does not scale well in an enterprise environment. This risk may be mitigated by using an automatic update capability. Spam protection mechanisms include, for example, signature definitions, rule sets, and algorithms. Exchange 2013 provides both antispam and antimalware protection out of the box. The Exchange 2013 antispam and antimalware product capabilities are limited but still provide some protection.

STIG	Date
MS Exchange 2013 Mailbox Server Security Technical Implementation Guide	2017-04-06

Details

Check Text ( C-70513r1_chk )
Review the Email Domain Security Plan (EDSP). Note: If using another DoD-approved antispam product for email or a DoD-approved email gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable. Open the Exchange Management Shell and enter the following command: Get-ContentFilterConfig \| Format-Table Name,Enabled; Get-SenderFilterConfig \| Format-Table Name,Enabled; Get-SenderIDConfig \| Format-Table Name,Enabled; Get-SenderReputationConfig \| Format-Table Name,Enabled If any of the following values returned are not set to True, this is a finding: Set-ContentFilterConfig Set-SenderFilterConfig Set-SenderIDConfig Set-SenderReputationConfig

Check Text ( C-70513r1_chk )

Review the Email Domain Security Plan (EDSP).

Note: If using another DoD-approved antispam product for email or a DoD-approved email gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable.

Open the Exchange Management Shell and enter the following command:

Get-ContentFilterConfig | Format-Table Name,Enabled; Get-SenderFilterConfig | Format-Table Name,Enabled; Get-SenderIDConfig | Format-Table Name,Enabled; Get-SenderReputationConfig | Format-Table Name,Enabled

If any of the following values returned are not set to True, this is a finding:

Set-ContentFilterConfig
Set-SenderFilterConfig
Set-SenderIDConfig
Set-SenderReputationConfig

Fix Text (F-76275r1_fix)
Update the EDSP. Open the Exchange Management Shell and enter the following command for any values that were not set to True: Set-ContentFilterConfig -Enabled $true Set-SenderFilterConfig -Enabled $true Set-SenderIDConfig -Enabled $true Set-SenderReputationConfig -Enabled $true