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|Don't Send ICMPv4 Redirect Messages
ICMP redirects are broadcast in order to reshape network traffic. A malicious user could use the system to send fake redirect packets and try to force all network traffic to pass through a network sniffer. Disabling ICMP redirect broadcasts mitigates this risk.
Don't Forward Source-Routed Packets
A source-routed packet attempts to specify the network path that the system should take. If the system is not configured to block the sending of source-routed packets, an attacker can redirect the system's network traffic.
Drop Incoming ICMPv4 Redirect Messages
ICMP redirects are broadcast in order to reshape network traffic. A malicious user could craft fake redirect packets and try to force all network traffic to pass through a network sniffer. If the system is not configured to ignore these packets, it could be suspectible to this kind of attack.
Drop Incoming ICMPv4 Timestamp Requests
ICMP Timestamp requests reveal information about the system and can be used to determine which operating system is installed. Precise time data can also be used to launch time based attacks against the system. Configuring the system to drop incoming ICMPv4 timestamp requests mitigates these risks.
Drop Incoming Source-Routed Packets
A source-routed packet attempts to specify the network path the packet should take. If the system is not configured to block the incoming source-routed packets, an attacker can redirect the system's network traffic. Configuring the system to drop incoming source-routed IPv4 packets mitigates this risk.
Enable Application Firewall
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.
Gatekeeper settings must be configured correctly to only allow the system to run applications downloaded from the Mac App Store. Administator 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 Apple issued certificate in order to run. Digital signatures all ...
Ensure Audit Logs are Kept for 1 Week or Longer
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.
Lock Emergency Accounts after 72 Hours
Emergency administrator accounts are privileged accounts which are established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possi ...
Lock the Screen with a Screensaver after 15 Minutes of Inactivity
A screensaver must be enabled and set to require a password to unlock. The timeout should be set to fifteen minutes of inactivity. This mitigates the risk that a user might forget to manually lock the screen before stepping away from the computer.
A session time-out lock is a temporary action taken when a user stops work and moves ...
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