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Intrusion Detection and Prevention
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In information security, intrusion detection is the practice of detecting attempts (successful as well as unsuccessful) to compromise a network resource. Intrusion detection does not usually involve the prevention of intrusions; however, we will discuss some preventive measures that can work in tandem with intrusion detection. With any intrusion detection solution, it is important that it somehow alerts you to potential intrusions so that you can determine whether your security was actually compromised, allowing you to act swiftly in order to limit the damage. Once you ve mitigated the damage, you can examine what the attack vector was, investigate whether it was done maliciously, and then take measures to prevent future intrusions based on this information.
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CHAPTER 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools
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Host Intrusion Detection System
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The purpose of a host intrusion detection system is to monitor and analyze a system in such a way that an administrator can determine whether a change has occurred on a system. Most host-based intrusion detection systems focus on checking for changes to configuration files or folders containing binary files (applications).
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Tripwire
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Tripwire is an intrusion detection system that is used to track changes to the files on a computer. Tripwire can scan for files on computers by creating a checksum of the files and folders on a system, and then comparing that against a checksum created at installation time. This enables a fast scan of a variety of files and folders on a computer. Regular Tripwire scans will alert system administrators of changes to the file system that shouldn t be made. Some folders we recommend scanning regularly include the following:
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/dev /opt /usr /usr/sbin /bin /mach.kern /Library/Preferences /Library/FileSystems /etc /System/Library/Extensions /System/Library/CoreServices
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Tripwire Installation
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The simplest method of installing Tripwire is to first install MacPorts or Fink. Both of these are package management tools that allow for easy installation of software from a large repository of open source projects. Tripwire is available through both of these tools, and the source is also available from Sourceforge. To install Tripwire from MacPorts, you would use the port command.
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sudo port install tripwire
After installation is finished, run the tripwire configuration script. This will create the necessary configuration files and passphrases, and then sign the configuration files with those passphrases.
sudo /opt/local/etc/tripwire/twsetup.sh
When that s finished, you need to define the baseline state of the computer.
sudo tripwire --init
To update your Tripwire database after making system changes, run this command:
sudo tripwire -m u -r /opt/var/db/tripwire/report/day-month-year-initials.twr
CHAPTER 17: Network Scanning, Intrusion Detection, and Intrusion Prevention Tools
To update your Tripwire config, change the /opt/local/etc/twcfg.txt file, and run this command:
sudo twadmin -m F -S /opt/local/etc/tripwire /site.key /opt/local/etc/tripwire/twcfg.txt
To enforce a new policy, edit the /opt/local/etc/tripwire/twpol.txt file, and run this command:
sudo twadmin -m p > /opt/local/etc/tripwire/twpol.txt
To view Tripwire reports, run this command:
sudo twprint -m r -r /opt/local/var/db/tripwire/report/*.twr
NOTE: A .twr file is a Tripwire report file. To scan for changes that have been made to the system, run this command:
sudo tripwire -m c
To e-mail these changes to the e-mail address listed in the config file, if you have identified an e-mail address, run the following command:
sudo tripwire m c -M
Bear in mind that Tripwire will not be able to restore any modified files that it finds. This is another reason that proper backups are important.
Network Intrusion Detection
Host-based intrusion detection scans the system for changes. But it is also possible to use a network intrusion detection system (NIDS), which can scan the network interface of systems to identify traffic patterns based on signatures of known exploits. One example of a popular NIDS application is snort.
Snort from the Command Line
Snort is an open source network intrusion detection and prevention system that is capable of packet logging and real-time traffic analysis. Proprietary solutions that include integrated hardware and support services are sold by Sourcefire, and there are hundreds of additional rule sets and downloads available to extend the snort platform. Snort can perform protocol analysis along with content matching, and it is often used to help detect attacks and probes. But it s mainly used as a means of finding existing threats to your network infrastructure. Some of the attacks that snort can detect include buffer overflows, stealthy port scans (such as those stemming from nmap), specific CGI attacks, SMB probes, and OS fingerprinting techniques. Snort can also be used for intrusion prevention by dropping attacks as they are taking place or augmenting your firewall to block future attempts from flagged IP addresses. SnortSnarf, sguil, OSSIM, and the Basic Analysis and Security Engine (BASE) help administrators effectively analyze the mountains of data generated by snort.
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