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The operating system must implement DoD-approved encryption to protect the confidentiality of remote access sessions.


Overview

Finding ID Version Rule ID IA Controls Severity
V-59529 AOSX-10-000035 SV-73959r1_rule High
Description
The 'rexec' service must be disabled. The 'rexec' service does not implement crypto and has had several security vulnerabilities in the past. It is disabled by default; enabling it would increase the attack surface of the system. Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD non-public information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP) thereby providing a degree of confidentiality. The encryption strength of mechanism is selected based on the security categorization of the information.
STIG Date
Apple OS X 10.10 (Yosemite) Workstation Security Technical Implementation Guide 2017-04-06

Details

Check Text ( C-60299r3_chk )
To check if the 'rexec' service is disabled, use the following command:

sudo launchctl print-disabled system | grep com.apple.rexecd

If the results do not show the following:

"com.apple.rexecd" => true

this is a finding.
Fix Text (F-64939r1_fix)
To disable the 'rexec' service, run the following command:

sudo launchctl disable system/com.apple.rexecd

The system may need to be restarted for the update to take effect.