The operating system must monitor remote access methods.

From Apple OS X 10.10 (Yosemite) Workstation Security Technical Implementation Guide

Part of SRG-OS-000032

Associated with: CCI-000067

SV-73965r1_rule The operating system must monitor remote access methods.

Vulnerability discussion

Remote access services, such as those providing remote access to network devices and information systems, increase risk and expose those systems to possible cyber attacks, so all remote access should be closely monitored and audited. Only authorized users should be permitted to remotely access DoD non-public information systems. An attacker might attempt to log in as an authorized user, through stolen credentials, unpatched exploits of the remote access service, or brute force attempts to guess a valid username and password. If a user is attempting to log in to a system from an unusual location or at an unusual time, or if there are many failed attempts, there is a possibility that the system is the target of a cyber attack. Auditing logon events mitigates this risk by recording all logon attempts, successful and unsuccessful, to the system.

Check content

To check to make sure the audit daemon is configured to log all login events, both local and remote, run the following command: sudo grep ^flags /etc/security/audit_control The flag 'lo' should be included in the list of flags set. If it is not, this is a finding.

Fix text

To make sure the appropriate flags are enabled for auditing, run the following command: sudo sed -i.bak '/^flags/ s/$/,lo/' /etc/security/audit_control; sudo audit -s A text editor may also be used to implement the required updates to the /etc/security/audit_control file.

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