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Hardening Networks: Log files are used extensively during the process of tightening a network When firewall rules are written to restrict more and more inbound traffic, overzealous network administrators can accidentally lock the front door Log analysis can help determine what pathways in are blocked that should be opened and vice versa
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The biggest trick to successful logging is gathering the right amount of information If you gather too little, the critical information you need might not be there If you gather too much, you might never find the needle in the silo full of hay The following are points worth considering:
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Part XII Detecting Intrusions 409 Encryption: Ideally, all logging data should be encrypted This prevents hackers 40 from modifying or reading the log data
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Transit: Get your logs to one place securely Make sure all of your transfer channels Intrusions: Logging and are encrypted or otherwise secure Many high security systems send logs via one- Analysis way cables to the remote logging system Secure the Central Logging System: A central logging system is a prime target for hackers Make sure they can t get onto it One technique is to ensure that the system can t be remotely accessed This might mean keeping the system off the network Logs can be sent to the log system over a secure serial link that is only capable of writing whatever it receives It would be impossible to control the log computer over the serial link Another trick is to write the logs to write-once media such as a CD-R or DVD-ROM giving the hacker no chance of deleting or modifying logs If you re not into rainforests and own a sizeable storage facility, you can also dump logs straight to a printer Consistency: Getting all of the logs into a standard, consistent format can be very helpful when analyzing information Some of the more advanced analysis tools can cross-correlate different types of logging information to spot potential problems For example, firewall logs can be cross-referenced against Web server logs The UNIX system logger, syslog, is one of the most widely used and understood logging systems Most applications can be configured to log to syslog Even Windows applications can log to syslog This ensures that syslog is the only system writing the consolidated log files, which is good for consistency Baseline Data: It s incredibly useful to have some sort of baseline information on the systems being logged when everything is healthy This acts as a control in the evil experiment known as hacking prevention A number of analysis tools will actually detect problems by comparing information against such a baseline Divide and Conquer: Separate your logs into two groups: the things you expect to see, and everything else First look through the everything else and examine the weird stuff that you can t explain Then simplify the things you re expecting and look for what s missing If you expect daily logs from a certain application, get worried if one of the days is not there Erasing Tracks: Put yourself in the hacker s shoes If you were a hacker, what tracks might you leave, and how would you erase them These are the things you should be securely logging A secure log will not only show the hacker in action, but it will also show the hacker attempting to erase tracks Here s a trick: Hackers will attempt to compile their attack software once they break into a machine Log all attempts at running the compiler and capture the input This will expose the hacker and his or her trojan programs
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