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Some creative software engineers have developed tools to fool NIDS's or even attack them. Such tools are discussed later in this lesson.
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Many different organizations produce NIDS's. Some are free and others cost thousands of dollars. Amazingly, the saying "you get what you pay for" doesn't seem to apply to NIDS's. The free NIDS's are sometimes rated higher than the commercial ones (see the MCP Magazine article "Barbarians at the Gate" by Saoutine, Perfiliev, and Corti, available at http://www.mcpmag.com). Here are some examples: Snort is a free open-source NIDS.
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Enterasys Networks' Dragon is a commercial NIDS.
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Realsecure is a commercial NIDS available from Internet Security Systems.
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NetProwler is a commercial NIDS available from Symantec.
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NFR NID is a commercial NIDS from NFR Security.
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Argus is a free network-monitoring tool for UNIX-based systems, and includes intrusion detection capabilities.
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SWATCH (Simple WATCHer) is a free LFM for UNIX-based systems. For more information on NIDS, visit the SANS IDS FAQ at http://www.sans.org/newlook/resources/IDFAQ/ID_FAQ.htm. NIDS Attack and Evasion As you learned in 4, attackers might attempt to attack, bypass, disable, or fool those systems. There are several publicly available tools for attacking or confusing NIDS's. Here are some examples and descriptions of NIDS attack tools: Stick launches a direct attack against the NIDS using a Snort signature file that is used to identify attacks. The attack causes a large number of false alarms, which reduces the system resources of the NIDS. So many false alarms could cause a real alarm to go unnoticed by security administrators or the real alarm might not even be logged by the NIDS due to lack of system
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Fragroute is a NIDS evasion tool that hides attacks from the NIDS by obfuscating attack packets. The tool intercepts, modifies, rewrites, and reorders packets so that the NIDS cannot identify them.
Tribe Flood Network 2000 is a DDoS attack tool that uses encryption, decoy packets, and IP address spoofing to avoid NDIS identification. (DDoS attacks are described in more detail in the next lesson.) Host-Based IDS A host-based IDS (HIDS) is installed on individual computers to protect those individual systems. HIDS's are much more reliable than NIDS's in detecting attacks on individual systems. HIDS typically utilize operating system audit trails and system logs. Operating system audit trails, generated by the core of the operating system (kernel), are quite reliable for tracking system events. System logs also track system events and are smaller and easier to interpret. However, system logs are sometimes modified by attackers, so focusing on both audit trails and system logs provides a double-checking feature. Many HIDS's are part of personal firewall software. Personal firewalls, or host wrappers, can examine all network packets, connection attempts, and logon attempts to their host machines. In addition, HIDS's can check the integrity of system files (and other files) to ensure that they are not tampered with. Some HIDS's are also designed to report intrusion attempts to a central IDS console located somewhere else on the network. This configuration allows a security administrator to monitor multiple host systems from one location. There are several benefits to using a HIDS on a network to protect your systems, including these: They are better than NIDS's at monitoring and keeping track of local system events.
They aren't typically hindered by encrypted attacks. HIDS's can read transmitted packets before they are encrypted and received packets after they are decrypted.
They can help to detect software integrity breaches, such as Trojan horse software, file modifications, and so on.
Because HIDS's only protect a single system, switches, VPNs, and routers do not affect their functionality.
Although HIDS's have several benefits, they also have limitations, such as these:
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Difficult to manage. HIDS's are more difficult to manage than NIDS's in large networks because they must be configured and controlled on individual systems. Susceptible to DoS attacks. Attacks against the HIDS-protected host might affect the HIDS itself. DoS attacks against the host might disrupt or disable the HIDS. A successful attack against a host protected by a HIDS could potentially disable and destroy evidence collected by the HIDS. Require host resources. HIDS's require resources from the protected host. HIDS's need extra hard disk space to store logs and tracking information. HIDS's must also utilize processor time and memory to analyze packets, user-issued commands, audit trails, and system logs to protect the client.
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