What is an Intrusion Detection System (IDS)?

Classification of Intrusion Detection Systems

Intrusion detection systems are designed to be deployed in different environments. And like many cybersecurity solutions, an IDS can either be host-based or network-based.

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• Host-Based IDS (HIDS): A host-based IDS is deployed on a particular endpoint and designed to protect it against internal and external threats. Such an IDS may have the ability to monitor network traffic to and from the machine, observe running processes, and inspect the system&#;s logs. A host-based IDS&#;s visibility is limited to its host machine, decreasing the available context for decision-making, but has deep visibility into the host computer&#;s internals.
• Network-Based IDS (NIDS): A network-based IDS solution is designed to monitor an entire protected network. It has visibility into all traffic flowing through the network and makes determinations based upon packet metadata and contents. This wider viewpoint provides more context and the ability to detect widespread threats; however, these systems lack visibility into the internals of the endpoints that they protect.

 

Due to the different levels of visibility, deploying a HIDS or NIDS in isolation provides incomplete protection to an organization&#;s system. A unified threat management solution, which integrates multiple technologies in one system, can provide more comprehensive security.

Detection Method of IDS Deployment

Beyond their deployment location, IDS solutions also differ in how they identify potential intrusions:

• Signature Detection: Signature-based IDS solutions use fingerprints of known threats to identify them. Once malware or other malicious content has been identified, a signature is generated and added to the list used by the IDS solution to test incoming content. This enables an IDS to achieve a high threat detection rate with no false positives because all alerts are generated based upon detection of known-malicious content. However, a signature-based IDS is limited to detecting known threats and is blind to zero-day vulnerabilities.
• Anomaly Detection: Anomaly-based IDS solutions build a model of the &#;normal&#; behavior of the protected system. All future behavior is compared to this model, and any anomalies are labeled as potential threats and generate alerts. While this approach can detect novel or zero-day threats, the difficulty of building an accurate model of &#;normal&#; behavior means that these systems must balance false positives (incorrect alerts) with false negatives (missed detections).
• Hybrid Detection: A hybrid IDS uses both signature-based and anomaly-based detection. This enables it to detect more potential attacks with a lower error rate than using either system in isolation.

IDS vs Firewalls

Intrusion Detection Systems and firewalls are both cybersecurity solutions that can be deployed to protect an endpoint or network. However, they differ significantly in their purposes.

An IDS is a passive monitoring device that detects potential threats and generates alerts, enabling security operations center (SOC) analysts or incident responders to investigate and respond to the potential incident. An IDS provides no actual protection to the endpoint or network. A firewall, on the other hand, is designed to act as a protective system. It performs analysis of the metadata of network packets and allows or blocks traffic based upon predefined rules. This creates a boundary over which certain types of traffic or protocols cannot pass.

Since a firewall is an active protective device, it is more like an Intrusion Prevention System (IPS) than an IDS. An IPS is like an IDS but actively blocks identified threats instead of simply raising an alert. This complements the functionality of a firewall, and many next-generation firewalls (NGFWs) have integrated IDS/IPS functionality. This enables them to both enforce the predefined filtering rules (firewalls) and detect and respond to more sophisticated cyber threats (IDS/IPS). Learn more about the IPS vs IDS debate here.

Selecting an IDS Solution

An IDS is a valuable component of any organization&#;s cybersecurity deployment. A simple firewall provides the foundation for network security, but many advanced threats can slip past it. An IDS adds an additional line of defense, making it more difficult for an attacker to gain access to an organization&#;s network undetected.

 

When selecting an IDS solution, it is important to carefully consider the deployment scenario. In some cases, an IDS may be the best choice for the job, while, in others, the integrated protection of an IPS may be a better option. Using a NGFW that has built-in IDS/IPS functionality provides an integrated solution, simplifying threat detection and security management.

 

Check Point has many years of experience in developing IDS and IPS systems that provide a high level of threat detection with very low error rates, enabling SOC analysts and incident responders to easily identify true threats. To see our NGFWs, with integrated IDS/IPS functionality, in action, request a demonstration or simply contact us with any questions. Furthermore, you&#;re welcome to learn about preventing attacks on IoT networks and devices in this webinar.

An Intrusion Detection System (IDS) is a security tool that monitors a computer network or systems for malicious activities or policy violations. It helps detect unauthorized access, potential threats, and abnormal activities by analyzing traffic and alerting administrators to take action. An IDS is crucial for maintaining network security and protecting sensitive data from cyber-attacks.

An Intrusion Detection System (IDS) maintains network traffic looks for unusual activity and sends alerts when it occurs. The main duties of an Intrusion Detection System (IDS) are anomaly detection and reporting, however, certain Intrusion Detection Systems can take action when malicious activity or unusual traffic is discovered. In this article, we will discuss every point about the Intrusion Detection System.

What is an Intrusion Detection System?

A system called an intrusion detection system (IDS) observes network traffic for malicious transactions and sends immediate alerts when it is observed. It is software that checks a network or system for malicious activities or policy violations. Each illegal activity or violation is often recorded either centrally using an SIEM system or notified to an administration. IDS monitors a network or system for malicious activity and protects a computer network from unauthorized access from users, including perhaps insiders. The intrusion detector learning task is to build a predictive model (i.e. a classifier) capable of distinguishing between &#;bad connections&#; (intrusion/attacks) and &#;good (normal) connections&#;.

Working of Intrusion Detection System(IDS)

• An IDS (Intrusion Detection System) monitors the traffic on a computer network to detect any suspicious activity.

• It analyzes the data flowing through the network to look for patterns and signs of abnormal behavior.

• The IDS compares the network activity to a set of predefined rules and patterns to identify any activity that might indicate an attack or intrusion.

• If the IDS detects something that matches one of these rules or patterns, it sends an alert to the system administrator.

• The system administrator can then investigate the alert and take action to prevent any damage or further intrusion.

 

Classification of Intrusion Detection System(IDS)

 Intrusion Detection System are classified into 5 types:

• Network Intrusion Detection System (NIDS):

  Network intrusion detection systems (NIDS) are set up at a planned point within the network to examine traffic from all devices on the network. It performs an observation of passing traffic on the entire subnet and matches the traffic that is passed on the subnets to the collection of known attacks. Once an attack is identified or abnormal behavior is observed, the alert can be sent to the administrator. An example of a NIDS is installing it on the subnet where

  firewalls

  are located in order to see if someone is trying to crack the

  firewall

  .

• Host Intrusion Detection System (HIDS):

  Host intrusion detection systems (HIDS) run on independent hosts or devices on the network. A HIDS monitors the incoming and outgoing packets from the device only and will alert the administrator if suspicious or malicious activity is detected. It takes a snapshot of existing system files and compares it with the previous snapshot. If the analytical system files were edited or deleted, an alert is sent to the administrator to investigate. An example of HIDS usage can be seen on mission-critical machines, which are not expected to change their layout.

• Protocol-Based Intrusion Detection System (PIDS):

  Protocol-based intrusion detection system (PIDS) comprises a system or agent that would consistently reside at the front end of a server, controlling and interpreting the protocol between a user/device and the server. It is trying to secure the web server by regularly monitoring the

  HTTPS protocol

  stream and accepting the related

  HTTP protocol

  . As HTTPS is unencrypted and before instantly entering its web presentation layer then this system would need to reside in this interface, between to use the HTTPS.

• Application Protocol-Based Intrusion Detection System (APIDS):

  An application

  Protocol-based Intrusion Detection System

  (APIDS) is a system or agent that generally resides within a group of servers. It identifies the intrusions by monitoring and interpreting the communication on application-specific protocols. For example, this would monitor the SQL protocol explicitly to the middleware as it transacts with the database in the web server.

• Hybrid Intrusion Detection System:

  Hybrid intrusion detection system is made by the combination of two or more approaches to the intrusion detection system. In the hybrid intrusion detection system, the host agent or system data is combined with network information to develop a complete view of the network system. The hybrid intrusion detection system is more effective in comparison to the other intrusion detection system. Prelude is an example of Hybrid IDS.

What is an Intrusion in Cybersecurity?

Understanding Intrusion Intrusion is when an attacker gets unauthorized access to a device, network, or system. Cyber criminals use advanced techniques to sneak into organizations without being detected. Common methods include:

• Address Spoofing:

  Hiding the source of an attack by using fake, misconfigured, or unsecured proxy servers, making it hard to identify the attacker.

• Fragmentation

  : Sending data in small pieces to slip past detection systems.

• Pattern Evasion:

  Changing attack methods to avoid detection by IDS systems that look for specific patterns.

• Coordinated Attack:

  Using multiple attackers or ports to scan a network, confusing the IDS and making it hard to see what is happening.

Intrusion Detection System Evasion Techniques

• Fragmentation:

  Dividing the packet into smaller packet called fragment and the process is known as

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  fragmentation

  . This makes it impossible to identify an intrusion because there can&#;t be a malware signature.

• Packet Encoding:

  Encoding packets using methods like Base64 or hexadecimal can hide malicious content from signature-based IDS.

• Traffic Obfuscation:

  By making message more complicated to interpret, obfuscation can be utilised to hide an attack and avoid detection.

• Encryption:

  Several security features, such as data integrity, confidentiality, and data privacy, are provided by

  encryption

  . Unfortunately, security features are used by malware developers to hide attacks and avoid detection.

Benefits of IDS

• Detects Malicious Activity:

  IDS can detect any suspicious activities and alert the system administrator before any significant damage is done.

• Improves Network Performance:

  IDS can identify any performance issues on the network, which can be addressed to improve network performance.

• Compliance Requirements:

  IDS can help in meeting compliance requirements by monitoring network activity and generating reports.

• Provides Insights:

  IDS generates valuable insights into network traffic, which can be used to identify any weaknesses and improve network security.

Detection Method of IDS

• Signature-Based Method:

  Signature-based IDS detects the attacks on the basis of the specific patterns such as the number of bytes or a number of 1s or the number of 0s in the network traffic. It also detects on the basis of the already known malicious instruction sequence that is used by the malware. The detected patterns in the IDS are known as signatures. Signature-based IDS can easily detect the attacks whose pattern (signature) already exists in the system but it is quite difficult to detect new malware attacks as their pattern (signature) is not known.

• Anomaly-Based Method:

  Anomaly-based IDS was introduced to detect unknown malware attacks as new malware is developed rapidly. In anomaly-based IDS there is the use of machine learning to create a trustful activity model and anything coming is compared with that model and it is declared suspicious if it is not found in the model. The machine learning-based method has a better-generalized property in comparison to signature-based IDS as these models can be trained according to the applications and hardware configurations.

Comparison of IDS with Firewalls

IDS and firewall both are related to network security but an IDS differs from a firewall as a firewall looks outwardly for intrusions in order to stop them from happening. Firewalls restrict access between networks to prevent intrusion and if an attack is from inside the network it doesn&#;t signal. An IDS describes a suspected intrusion once it has happened and then signals an alarm.

Why Are Intrusion Detection Systems (IDS) Important?

An Intrusion Detection System (IDS) adds extra protection to your cybersecurity setup, making it very important. It works with your other security tools to catch threats that get past your main defenses. So, if your main system misses something, the IDS will alert you to the threat.

Placement of IDS

• The most optimal and common position for an IDS to be placed is behind the firewall. Although this position varies considering the network. The &#;behind-the-firewall&#; placement allows the IDS with high visibility of incoming network traffic and will not receive traffic between users and network. The edge of the network point provides the network the possibility of connecting to the extranet.

• In cases, where the IDS is positioned beyond a network&#;s firewall, it would be to defend against noise from internet or defend against attacks such as port scans and network mapper.An IDS in this position would monitor layers 4 through 7 of the

  OSI model

  and would use Signature-based detection method. Showing the number of attemepted breacheds instead of actual breaches that made it through the firewall is better as it reduces the amount of false positives. It also takes less time to discover successful attacks against network.

• An advanced IDS incorporated with a firewall can be used to intercept complex attacks entering the network. Features of advanced IDS include multiple security contexts in the routing level and bridging mode. All of this in turn potentially reduces cost and operational complexity.

• Another choice for IDS placement is within the network. This choice reveals attacks or suspicious activity within the network. Not acknowledging security inside a network is detrimental as it may allow users to bring about security risk, or allow an attacker who has broken into the system to roam around freely.

Advantages

• Early Threat Detection

  : IDS identifies potential threats early, allowing for quicker response to prevent damage.

• Enhanced Security

  : It adds an extra layer of security, complementing other cybersecurity measures to provide comprehensive protection.

• Network Monitoring

  : Continuously monitors network traffic for unusual activities, ensuring constant vigilance.

• Detailed Alerts

  : Provides detailed alerts and logs about suspicious activities, helping IT teams investigate and respond effectively.

Disadvantages

• False Alarms

  : IDS can generate false positives, alerting on harmless activities and causing unnecessary concern.

• Resource Intensive

  : It can use a lot of system resources, potentially slowing down network performance.

• Requires Maintenance

  : Regular updates and tuning are needed to keep the IDS effective, which can be time-consuming.

• Doesn&#;t Prevent Attacks

  : IDS detects and alerts but doesn&#;t stop attacks, so additional measures are still needed.

• Complex to Manage

  : Setting up and managing an IDS can be complex and may require specialized knowledge.

Conclusion

Intrusion Detection System (IDS) is a powerful tool that can help businesses in detecting and prevent unauthorized access to their network. By analyzing network traffic patterns, IDS can identify any suspicious activities and alert the system administrator. IDS can be a valuable addition to any organization&#;s security infrastructure, providing insights and improving network performance.

Frequently Asked Questions on Intrusion Detection System &#; FAQs

Difference between IDS and IPS?

When IDS detects intrusion it only alerts network administration while Intrusion Prevention System(IPS) blocks the malicious packets before it reaches to destination.

What are the key challenges of IDS implementation?

False positives and False Negatives are IDSs&#; primary drawbacks. False positives add to the noise that can seriously impair an intrusion detection system&#;s (IDS) efficiency, while a false negative occurs when an IDS misses an intrusion and consider it valid.

Can IDS detect insider threats?

Yes Intrusion Detection System can detect threats.

What is the role of machine learning in IDS?

By using Machine Learning, one can achieve a high detection rate and a low false alarm rate.

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