STIGQter: STIG Summary: Microsoft Exchange 2013 Mailbox Server Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 22 Jan 2021:

Exchange Receive connectors must control the number of recipients per message.

DISA Rule

SV-207302r615936_rule

Vulnerability Number

V-207302

Group Title

SRG-APP-000247

Rule Version

EX13-MB-000180

Severity

CAT III

CCI(s)

• CCI-001095 - The information system manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Update the EDSP.

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -MaxRecipientsPerMessage 5000

Note: The <IdentityName> value must be in quotes.

or

The value as identified by the EDSP that has obtained a signoff with risk acceptance.

Repeat the procedure for each Receive connector.

Check Contents

Review the Email Domain Security Plan (EDSP).

Determine the Maximum Recipients per Message value.

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select Name, Identity, MaxRecipientsPerMessage

For each Receive connector, evaluate the MaxRecipientsPerMessage value.

For each Receive connector, if the value of MaxRecipientsPerMessage is not set to 5000, this is a finding.

or

If the value of Maximum Recipients per Message is set to a value other than 5000 and has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-207302

Documentable

False

Rule Version

EX13-MB-000180

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Determine the Maximum Recipients per Message value.

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select Name, Identity, MaxRecipientsPerMessage

For each Receive connector, evaluate the MaxRecipientsPerMessage value.

For each Receive connector, if the value of MaxRecipientsPerMessage is not set to 5000, this is a finding.

or

If the value of Maximum Recipients per Message is set to a value other than 5000 and has signoff and risk acceptance in the EDSP, this is not a finding.

Check Content Reference

M

Target Key

2923

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