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

The Exchange Send connector connections count must be limited.

DISA Rule

SV-207308r615936_rule

Vulnerability Number

V-207308

Group Title

SRG-APP-000247

Rule Version

EX13-MB-000210

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-TransportServer -Identity <'IdentityName'> -MaxOutboundConnections 1000

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

or

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

Check Contents

Review the Email Domain Security Plan (EDSP).

Determine the value for SMTP Server Maximum Outbound Connections.

Open the Exchange Management Shell and enter the following command:

Get-TransportService | Select Name, Identity, MaxOutboundConnections

If the value of MaxOutboundConnections is not set to 1000, this is a finding.

or

If the value of MaxOutboundConnections is set to a value other than 1000 and has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-207308

Documentable

False

Rule Version

EX13-MB-000210

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Determine the value for SMTP Server Maximum Outbound Connections.

Open the Exchange Management Shell and enter the following command:

Get-TransportService | Select Name, Identity, MaxOutboundConnections

If the value of MaxOutboundConnections is not set to 1000, this is a finding.

or

If the value of MaxOutboundConnections is set to a value other than 1000 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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