Check: EX16-ED-000290
Microsoft Exchange 2016 Edge Transport Server STIG:
EX16-ED-000290
(in versions v2 r5 through v1 r1)
Title
Exchange Receive connectors must control the number of recipients chunked on a single message. (Cat III impact)
Discussion
Email system availability depends in part on best practice strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound message size. Failure to control the configuration strategy can result in loss of data or system availability. This setting enables the administrator to enable "chunking" on received messages as they arrive at the domain. This is done so large message bodies can be relayed by the remote sender to the Receive connector in multiple, smaller chunks.
Check Content
Open the Exchange Management Shell and enter the following command: Get-ReceiveConnector | Select Name, Identity, ChunkingEnabled For each receive connector, if the value of "ChunkingEnabled" is not set to "True", this is a finding.
Fix Text
Open the Exchange Management Shell and enter the following command: Set-ReceiveConnector -Identity <'IdentityName'> -ChunkingEnabled $true Note: The <IdentityName> value must be in single quotes. Repeat the procedure for each receive connector.
Additional Identifiers
Rule ID: SV-221228r879651_rule
Vulnerability ID: V-221228
Group Title: SRG-APP-000247
Expert Comments
CCIs
Number | Definition |
---|---|
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. |
Controls
Number | Title |
---|---|
SC-5 (2) |
Excess Capacity / Bandwidth / Redundancy |