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The Application Firewall is the built in firewall that comes with Mac OS X and must be enabled. Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.

The system must allow only applications downloaded from the App Store to run. Gatekeeper settings must be configured correctly to only allow the system to run applications downloaded from the Mac App Store. Administrator users will still have the option to override these settings on a per app basis. Gatekeeper is a security feature that ensures that applications must be digitally signed by an Appl ...

The audit service must be configured to require that records are kept for 7 days or longer before deletion when there is no central audit record storage facility. When expire-after is set to 7d, the audit service will not delete audit logs until the log data is at least 7 days old.

The permissions of the rcp executable must be set as appropriate. The rcp utility copies files between machines.

The kernel extension for Wi-Fi network devices such as Airport must be removed to ensure that users will not be able to reactivate wireless networking at a later time. System updates will sometimes replace deleted kernel extensions. Administrator users may need to periodically check to ensure that the file remains deleted. Alternately, the wireless card hardware may be removed from the system.

The default global umask setting must be set to '027' for user applications. The setting '027' ensures that user created files and directories will be readable, but not writable, by users that share the same group id. Users with a different group id will not be able to read or write those files. This mitigates the risk that unauthorized users might be able to read and write files saved to the syst ...

The owner of the ipcs executable must be root. The ipcs utility provides information on System V interprocess communication (IPC) facilities on the system.

The group of the ipcs executable must be root. The ipcs utility provides information on System V interprocess communication (IPC) facilities on the system.

iTunes Music Sharing must be disabled. When iTunes Music Sharing is enabled, the computer starts a network listening service that shares the contents of the user's music collection with other users in the same subnet. Unnecessary network services should always be disabled because they increase the attack surface of the system. Disabling iTunes Music Sharing mitigates this risk.

The SSH Version should be explicity set to Version 2. Version 2 supports strong crypto and was rewritten from scratch to resolve several weaknesses in Version 1 that make it extremely vulnerable to attackers. The weaker crypto in Version 1 is potentially susceptible to certain forms of replay attacks. The system default is to only enable Version 2. A replay attack may enable an unauthorized user t ...


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