STIGQter: STIG Summary: MS Exchange 2013 Client Access Server Security Technical Implementation Guide Version: 1 Release: 3 Benchmark Date: 24 Jan 2020:

Exchange ActiveSync (EAS) must only use certificate-based authentication to access email.

DISA Rule

SV-84349r1_rule

Vulnerability Number

V-69727

Group Title

SRG-APP-000033

Rule Version

EX13-CA-000035

Severity

CAT II

CCI(s)

• CCI-000213 - The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-ActiveSyncVirtualDirectory -Identity ‘<ServerName>\Microsoft-Server-ActiveSync (Default Web Site)’ -BasicAuthEnabled $False -WindowsAuthEnabled $False -ClientCertAuth ‘Required’ -WebSites-InternalAuthenticationMethods ‘Certificate’ -ExternalAuthenticationMethods ‘Certificate’

Note: The <ServerName>Microsoft-Server-ActiveSync (Default Web Site) value must be in quotes.

Check Contents

Open the Exchange Management Shell and enter the following commands:

Get-ActiveSyncVirtualDirectory | Select Name, Identity

Get-ActiveSyncVirtualDirectory -Identity '<ServerName>Microsoft-Server-ActiveSync (Default Web Site)' | fl BasicAuthEnabled, WindowsAuthEnabled, ClientCertAuth, WebSiteSSLEnabled, InternalAuthenticationMethods, ExternalAuthenticationMethods

Note: The <ServerName>Microsoft-Server-ActiveSync (Default Web Site) value must be in quotes.

The command should return the following:

BasicAuthEnabled : False
WindowsAuthEnabled : False
ClientCertAuth : Required
WebSiteSSLEnabled : True
InternalAuthenticationMethods : {Certificate}
ExternalAuthenticationMethods : {Certificate}

If the values above are not returned, this is a finding.

Vulnerability Number

V-69727

Documentable

False

Rule Version

EX13-CA-000035

Severity Override Guidance

Open the Exchange Management Shell and enter the following commands:

Get-ActiveSyncVirtualDirectory | Select Name, Identity

Get-ActiveSyncVirtualDirectory -Identity '<ServerName>Microsoft-Server-ActiveSync (Default Web Site)' | fl BasicAuthEnabled, WindowsAuthEnabled, ClientCertAuth, WebSiteSSLEnabled, InternalAuthenticationMethods, ExternalAuthenticationMethods

Note: The <ServerName>Microsoft-Server-ActiveSync (Default Web Site) value must be in quotes.

The command should return the following:

BasicAuthEnabled : False
WindowsAuthEnabled : False
ClientCertAuth : Required
WebSiteSSLEnabled : True
InternalAuthenticationMethods : {Certificate}
ExternalAuthenticationMethods : {Certificate}

If the values above are not returned, this is a finding.

Check Content Reference

M

Target Key

3097

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