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Questions and Answers
What is a signature in the context of IDS?
What is the purpose of a signature in an IDS system?
What is the SNORT rule designed to detect in the given example?
What is the condition for the SNORT rule to issue an alert?
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What is the purpose of the detection_filter in the SNORT rule?
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What is the significance of the sid:1000001 in the SNORT rule?
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What is the purpose of the ICMP flood attack SNORT rule?
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What is the characteristic of a Ping of Death attack?
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What is the threshold for detecting a brute force attack on SSH using the provided SNORT rule?
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What is the purpose of the 'detection_filter' option in the SNORT rule?
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What is the common theme among the intrusion detection datasets mentioned?
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What is the sid value for the SNORT rule detecting Ping of Death attacks?
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What is the classtype of the SNORT rule detecting brute force attacks on SSH?
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Study Notes
ICMP Flood Attack
- An ICMP flood attack can be detected if a client sends more than 500 ICMP packets within 3 seconds.
- This type of attack involves sending a large number of ping messages to flood the network.
Ping of Death Attack
- A Ping of Death attack is a denial of service (DoS) attack that involves sending an IP packet larger than the 65,536 bytes allowed by the IP protocol.
- This attack can be detected if an ICMP packet is larger than 10,000 bytes.
Brute Force Attack
- A Brute Force attack involves attempting to obtain the login password of SSH by trying multiple login credentials.
- This attack can be detected if a client has more than 5 login attempts in 60 seconds.
Intrusion Detection Datasets
- There are several intrusion detection datasets available, including DARPA/KDD Cup 99, CAIDA, NSL-KDD, ISCX 2012, and ADFA-LD and ADFA-WD.
Signature Detection Techniques
- A signature is a pattern within a packet or a series of packets in a network traffic that corresponds to a known threat.
- Signatures can be used by IDS to identify threats, such as the CONFICKER worm.
TCP SYN Flood Attack
- A TCP SYN flood attack involves sending a large number of TCP SYN requests to a web server to flood the network.
- This attack can be detected if a client sends more than 100 TCP SYN requests to the server within 10 seconds.
Signature-Based IDS
- The detection process involves defining a signature, identifying the threat, and taking action.
- Advantages of signature-based IDS include high accuracy and low false positive rates, but it may not detect unknown threats.
- Disadvantages include the need for continuous updates and maintenance.
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Description
This quiz covers the lecture objectives of CYB236 Chapter 6, focusing on signature detection techniques in Intrusion Detection Systems (IDS). It defines what a signature is and explains the advantages and disadvantages of signature-based IDS detection process.
