STIGQter: STIG Summary: Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The Exchange Outbound Connection Timeout must be 10 minutes or less.

DISA Rule

SV-228390r612748_rule

Vulnerability Number

V-228390

Group Title

SRG-APP-000247

Rule Version

EX16-MB-000460

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 to specify the "ConnectionInactivityTimeOut" value.

Open the Exchange Management Shell and enter the following command:

Set-SendConnector -Identity <'IdentityName'> -ConnectionInactivityTimeOut 00:10:00

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

or

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

Check Contents

Review the Email Domain Security Plan (EDSP) or document that contains this information.

Determine the Connection Timeout value.

Open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select Name, Identity, ConnectionInactivityTimeOut

For each Send connector, if the value of "ConnectionInactivityTimeOut" is not set to "00:10:00", this is a finding.

or

If "ConnectionInactivityTimeOut" is set to a value other than "00:10:00" and has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-228390

Documentable

False

Rule Version

EX16-MB-000460

Severity Override Guidance

Review the Email Domain Security Plan (EDSP) or document that contains this information.

Determine the Connection Timeout value.

Open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select Name, Identity, ConnectionInactivityTimeOut

For each Send connector, if the value of "ConnectionInactivityTimeOut" is not set to "00:10:00", this is a finding.

or

If "ConnectionInactivityTimeOut" is set to a value other than "00:10:00" and has signoff and risk acceptance in the EDSP, this is not a finding.

Check Content Reference

M

Target Key

4223

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