STIGQter: STIG Summary: Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 30 Jan 2025:

Exchange Attachment filtering must remove undesirable attachments by file type.

DISA Rule

SV-259616r961161_rule

Vulnerability Number

V-259616

Group Title

SRG-APP-000261

Rule Version

EX19-ED-000130

Severity

CAT II

CCI(s)

• CCI-001308 - Automatically update spam protection mechanisms on an organization-defined frequency.

Weight

10

Fix Recommendation

Update the EDSP to reflect the list of undesirable attachment types that should be stripped.

Open the Exchange Management Shell and enter the following command:

Add-AttachmentFilterEntry -Name <'*.FileExtension'> -Type FileName

Repeat the procedure for each undesirable attachment type.

Check Contents

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Review the Email Domain Security Plan (EDSP).

Determine the list of undesirable attachment types that should be stripped.

Open the Exchange Management Shell and enter the following command:

Get-AttachmentFilterEntry

For each attachment type, if the values returned are different from the EDSP documented attachment types, this is a finding.

Vulnerability Number

V-259616

Documentable

False

Rule Version

EX19-ED-000130

Severity Override Guidance

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Review the Email Domain Security Plan (EDSP).

Determine the list of undesirable attachment types that should be stripped.

Open the Exchange Management Shell and enter the following command:

Get-AttachmentFilterEntry

For each attachment type, if the values returned are different from the EDSP documented attachment types, this is a finding.

Check Content Reference

M

Target Key

5579