The Pros & Cons of Intrusion Detection Systems

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Network Intrusion Detection System (NIDS)

A network intrusion detection system (NIDS) can be an integral part of an organization&#;s security, but they are just one aspect of many in a cohesive and safe system. They have many great applications, but there are also weaknesses that need to be considered. It is important to compare an NIDS against the alternatives, as well as to understand the best ways to implement them.

What Is an Intrusion Detection System?

Intrusion detection systems are a lot like fire alarms. Just as a fire alarm detects smoke, an intrusion detection system idenitifies incidents and potential threats. They are incredibly useful for raising awareness, but if you don&#;t hear the alarm or react appropriately, your house may burn down.

While a firewall is there to keep out malicious attacks, an IDS is there to detect whether someone or something is trying up to suspicious or nefarious activity. When it detects something, it notifies the system administrator.

An IDS is a visibility tool that sits off to the side of the network and monitors traffic. It consists of a management console and sensors. When the sensors encounter something that matches up to a previously detected attack signature, they report the activity to the console. An IDS can notify security personnel of infections, spyware or key loggers, as well as accidental information leakage, security policy violations, unauthorized clients and servers, and even configuration errors.

Intrusion Detection Systems vs. Intrusion Prevention Systems (IPS)

An IPS is similar to an IDS, except that they are able to block potential threats as well. They monitor, log and report activities, similarly to an IDS, but they are also capable of stopping threats without the system administrator getting involved. If an IPS is not tuned correctly, it can also deny legitimate traffic, so they are not suitable for all applications.

Network Intrusion Detection Systems vs. Host Intrusion Detection Systems (HIDS)

An NIDS and an HIDS are complementary systems that differ by the position of the sensors: network-based (monitoring the ethernet or WiFi) and host-based, respectively. Because of this, their uses and deployment are quite different.

Network-based sensors have a quicker response than host-based sensors and they are also easier to implement. An NIDS doesn&#;t need to alter the existing infrastructure and they monitor everything on a network segment, regardless of the target host&#;s operating system. As they do not need software loaded and managed at the different hosts in the network, they have a lower cost of setup and ownership.

An NIDS can detect attacks that an HIDS will miss because it looks at packet headers in real-time. In saying this, an HIDS will also be able to pick up some things that an NIDS will miss, such as unauthorized users making changes to the system files. An HIDS monitors event and audit logs, comparing new entries to attack signatures. This is resource intensive, so your organization will need to plan for the additional hardware required.

Another benefit of an NIDS is that they detect incidents in real-time, meaning that they can log evidence that an attacker may otherwise try to erase. While the real-time detection abilities of an NIDS allow for quicker responses, they also turn up more false positives than an HIDS. Hybrid NIDS and HIDS solutions that combine aspects of both systems are also available and can be useful in different scenarios.

Pros of Network Intrusion Detection Systems:

They Can Be Tuned to Specific Content in Network Packets

Firewalls may be able to show you the ports and IP addresses that are used between two hosts, but in addition a NIDS can be tuned to show you the specific content within the packets. This can be used to for uncovering intrusions such as exploitation attacks or compromised endpoint devices that are part of a botnet.

They Can Look at Data in the Context of the Protocol

When an NIDS performs protocol analysis, it looks at the TCP and UDP payloads. The sensors can detect suspicious activity because they know how the protocols should be functioning.

They Can Qualify and Quantify Attacks

An IDS analyzes the amount and types of attacks. This information can be used to change your security systems or implement new controls that are more effective. It can also be analyzed to identify bugs or network device configuration problems. The metrics can then be used for future risk assessments.

They Make It Easier to Keep Up With Regulation

Because an IDS gives you greater visibility across your network, they make it easier to meet security regulations. You can also use your IDS logs as part of the documentation to meet certain requirements.

They Can Boost Efficiency

Because IDS sensors can detect network devices and hosts, they can inspect the data within the network packets and identify the services or operating systems that are being utilized. This saves a lot of time when compared to doing it manually. An IDS can also automate hardware inventories, further reducing labor. These improved efficiencies can help to reduce an organization&#;s staff costs and offset the cost of implementing the IDS.

Cons of Network Intrusion Detection Systems:

They Will Not Prevent Incidents By Themselves

An IDS does not block or prevent attacks, they merely help to uncover them. Because of this, an IDS needs to be part of a comprehensive plan that includes other security measures and staff who know how to react appropriately.

An Experienced Engineer Is Needed to Administer Them

An IDS is immensely helpful for monitoring the network, but their usefulness all depends on what you do with the information that they give you. Because detection tools don&#;t block or resolve potential issues, they are ineffective at adding a layer of security unless you have the right personnel and policy to administer them and act on any threats.

They Do Not Process Encrypted Packets

An IDS cannot see into encrypted packets, so intruders can use them to slip into the network. An IDS will not register these intrusions until they are deeper into the network, which leaves your systems vulnerable until the intrusion is discovered. This is a huge concern as encryption is becoming more prevalent to keep our data secure.

IP Packets Can Still Be Faked

The information from an IP packet is read by an IDS, but the network address can still be spoofed. If an attacker is using a fake address, it makes the threat more difficult to detect and assess.

False Positives Are Frequent

One significant issue with an IDS is that they regularly alert you to false positives. In many cases false positives are more frequent than actual threats. An IDS can be tuned to reduce the number of false positives, however your engineers will still have to spend time responding to them. If they don&#;t take care to monitor the false positives, real attacks can slip through or be ignored.

They Are Susceptible to Protocol Based Attacks

An NIDS analyzes protocols as they are captured, which means that they face the same protocol based attacks as network hosts. An NIDS can be crashed by protocol analyzer bugs and also invalid data.

Contact us to discuss your requirements of Perimeter Intrusion Detection System. Our experienced sales team can help you identify the options that best suit your needs.

An IDS is only as good as its signature library. If it isn&#;t updated frequently, it won&#;t register the latest attacks and it can&#;t alert you about them. Another issue is that your systems are vulnerable until a new threat has been added to the signature library, so the latest attacks will always be a big concern.

Three advantages of a perimeter intrusion detection system

Over the past few months there has been a significant increase in the re-evaluation of site perimeter security, especially in the security estate, business park, factory and warehousing industries.

As a business owner, property owner or site security manager you will need to investigate additional security layers and early warning solutions to complement and enhance your current investment in fencing infrastructure and security technology. You should know that an effective perimeter intrusion detection system has the ability to save you time and money while delivering the very best protection for your premises.

So, what exactly are the advantages of perimeter intrusion detection systems (PIDS)?

1. Early warning with minimal false alarms

Multiple false alarms lead to complacency and you need to be certain that when you receive an alarm it is a real event. Most CCTV solutions generate massive amounts of false alarms, especially in environment with trees, branches and foliage. PIDS usually rely on vibration in order to ascertain whether there is an intruder or not. Furthermore, well-known internationally-recognised PIDS use a sequence of events and movements to minimise false alarms, accurately pinpoint the exact type of intrusion, such as cutting or climbing and the location of the intrusion.

The combination of a good quality fence acting as a barrier, an internationally recognised PIDS with minimal false alarms as detection mechanism and CCTV and remote monitoring as verification method is the best possible security solution.

2. Rapid detection

In the world of site security, there isn't a lot of time to play with. That's where perimeter intrusion detection systems such as VibraTek Fence and Wall Protection come in, giving you the advantage of early warning whenever suspicious activity is detected. Whether it is somebody prodding the fence, testing its resistance, or attempting to scale it &#; you will have the benefit of detecting the activity, giving you more time to assess the risk level and issue a response.

If you are operating an expansive site which is difficult to cover with security personnel, a perimeter intrusion detection system can cover your weak spots and ensure your reaction time to incidents is as fast as possible.

3. The convenience of compatibility

If you choose the right perimeter intrusion detection system and your fence is in good working order there is no need to invest in new or additional electric fencing. This is because the leading systems available can easily fit on existing fencing, with no additional construction required. All it takes is the correct installation method, using cable ties to attach the PIDS sensor cable to the fence and a connection to the alarm system or VMS. The sensor cable is able to sense any vibration or movement, remove false alarms and immediately notify your security team of activity around your premises.

So whatever type of fencing your site currently has in place, a recognised perimeter intrusion detection system will enable you to respond to suspicious activity quickly.

For a security solution which is highly effective, good value and requires less manpower, it is hard to beat a perimeter intrusion detection system.

The VibraTek solution

The VibraTek solution supplied by Samian Technologies has been independently evaluated by the UK government Centre for the Protection of the National Infrastructure (CPNI) agency. Part of the responsibilities of the CPNI is to advise high-security sites within the UK which perimeter detection system will provide the best value for money in terms of system performance and cost. More than 500 km of VibraTek sensors effectively secure hundreds of sites worldwide. It is sophisticated, yet easy to install.

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