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links starting with an uppercase S to a lowercase s To disable the mysql daemon, change the link from S90mysql to s90msql In Telnet, direct root login should be prohibited, and the passwords should be secure (minimum lengths, non-dictionary words that are mixedcase alpha-numerics) Change the passwords frequently, such as every three months For further protection, consider disabling Telnet, installing SSH instead, and connecting through SSH from designated secure hosts only
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What to Do If Attacked
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The following list includes some steps you should take if your system comes under attack:
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Gather as much information as possible Determine what part of the system was vulnerable Make appropriate changes
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If your network has been attacked, you need to gather as much information as possible Start with the system logs to try to determine how and when the attackers entered Some attackers attempt to remove evidence of their entry from the system logs, so be observant for the disappearance of information as well Careful examination of the logs will provide you with the attacker s method of entry (which security loophole the attacker came through) Once you know the vulnerability, you can check the different resources (Bugtraq, CERT, or distribution sites) to see if a patch has been made available for this loophole, and if so, apply it to your system If you cannot find a patch, you can certainly disseminate the existence of a security loophole, and a patch will usually come out in a short time Fortunately, most log entries that relate to security issues on an up-todate system represent failures on the part of the attacker The Linux community usually responds very quickly to system weaknesses and provides regular updates that render many intrusion tools useless Addressing failed attempts usually involves blocking the offending IP and contacting the service provider that owns the originating address It would also be a good idea to check CERT and Rootshell to see if there are any new exploits for the targeted service No system can be completely secure, and, from
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time to time, an intruder will be successful and perhaps even gain privileged access In a worst-case scenario, finding an intruder on a system might require dropping network interfaces, rebooting the server, or even doing a major restore of system files
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Handling an Attack That Is in Progress
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If you happen to catch an attack while it is in progress, the best thing to do is to remove the system from the network until you can resolve the weakness You might unplug the Ethernet or hang up the modem; this isn t always an option if the system absolutely needs to be available to other users during the time of the attack If you cannot bring down the network, you can disable the service from which the attack is originating by commenting it out in inetdconf, followed by a kill -HUP pid If that service is the one that must stay up, try to block a range of the attacker s IP in TCP wrappers Regardless of how it is done, you must modify your situation quickly to minimize damage
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Notify Service Provider or Local Authorities
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If you were able to get the IP address of the attacker (this is not difficult in most situations), you may be able to use the whois utility to find out who owns the domain block from which the attack originated If the owner is not the attacker, you will most likely receive some assistance
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Recovery from attack will be much easier if you are using tools like tripwire to point out files that have been compromised Having good backups of critical system files (login, ls, bash, etc) is important, as they are often used as back doors or Trojan horses by those who have gained privileged access If at all possible, keep the system disconnected from the network until you can discover the cause of the security breach
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