If the MDM server includes a mobile email management capability, the email client S/MIME encryption algorithm must be 3DES or AES. When AES is used, AES 128 bit encryption key length is the minimum requirement; AES 256 desired.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-36224	SRG-APP-196-MDM-205-MEM	SV-47628r1_rule		Medium

Description
Cryptography is only as strong as the encryption modules/algorithms that are employed to encrypt the data. Strong encryption must be used to protect the integrity and confidentiality of the data. In this case the requirement states that S/MIME must utilize a 3DES or AES encryption algorithm.

STIG	Date
Mobile Device Manager Security Requirements Guide	2013-01-24

Details

Check Text ( C-44464r1_chk )

Determine if the MDM server includes a mobile email management capability. If no, this requirement is not applicable. If yes, perform the following procedure: Verify the mobile email client is capable of providing S/MIME v3 (or later version) encryption of email. Talk to the site system administrator and have them confirm this capability exists in the MDM server. Also, review the MDM server configuration. If the mobile email client is not capable of providing S/MIME v3 (or later version) encryption of email with a 3DES or AES algorithm, this is a finding.

Fix Text (F-40754r1_fix)
Configure the MDM server so the email client on the mobile device is configured to utilize S/MIME encryption with a 3DES or AES algorithm.