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System hardening is the process of changing the configuration of a system (which could be a server, subsystem, or network device) so that it is more resistant to malfunctions and attacks The principles behind system hardening consist of the following: Changing Systems from Multifunction to Single-function An individual server that performs many functions may require the presence of several services, software modules, or applications to be running at once Consolidation may reduce the number of servers and make an environment simpler, but it also increases risk A vulnerability on a multifunction server places all services on the server at risk
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In an environment where each server performs a single function, a vulnerability in a function will place only that function at risk Server virtualization makes it easy to separate functions into separate OS instances while permitting them to continue to run on one physical system Removal of Unnecessary Services Only the services and software features required to support a system s purpose should be installed and running; all other services and features should be disabled and, if possible, removed altogether Removing unnecessary services reduces the vulnerability surface on a system to only those services that are required For example, the sendmail program should be disabled (prevented from running) or removed on Unix systems that do not need to send or receive e-mail Sendmail is a large, complex program that is the subject of ongoing security research, and new vulnerabilities are discovered from time to time Limiting Functionality or Privilege of Necessary Services After all unnecessary services have been removed from a server, only those that are required for the server s function will remain The functions that any necessary service is permitted to perform should be reduced to only those that are necessary Accomplishing this will vary, but limiting functionality should follow the principle whereby any unneeded function should be disabled if the configuration will permit this Each necessary service or program should be configured to run at the lowest possible privilege In the past, it was common for all generic services (and even many applications) to run at root, super-user, or administrator level Often this is unnecessary, and on systems where the privilege levels can be configured, each service should run at a lower service where possible The advantage of this is that if a particular service is compromised through a vulnerability, the attacker s ability to compromise the entire system may be limited to the ability afforded by the privilege level assigned to the service Changing Default Passwords One of the easiest ways for an intruder to attack a system is through known default passwords Often, the manufacturers of systems and software utilize a documented default password that makes it easy for a new user or customer to begin using the system But all too often these default credentials are never updated, which results in systems that are vulnerable to attacks that are easy to carry out Before being connected to a network, every system should be changed so that all accounts have nondefault passwords Using Nonpredictable Passwords If an intruder is able to compromise a system, he may (if he is able) attempt to retrieve the system s encrypted user account passwords and crack them If the intruder has been able to crack one system s passwords, he may attempt to log in to neighboring systems (those in the same organization) using the same user IDs and passwords If many or all systems use the same passwords, particularly for administrative accounts, the intruder may be able to easily compromise all other systems in the environment Similarly, if the intruder is able to detect a pattern in the use of passwords, he may be able to compromise many systems
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