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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-67487 AOSX-11-000035 SV-81977r1_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 10.11 Security Technical Implementation Guide 2018-01-04

Details

Check Text ( C-68051r1_chk )
To check if the "rexec" service is disabled, use the following command:

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

If the results do not show the following, this is a finding.

"com.apple.rexecd" => true
Fix Text (F-73601r1_fix)
To disable the "rexec" service, run the following command:

/usr/bin/sudo /bin/launchctl disable system/com.apple.rexecd

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