A Software Tool for Network Intrusion Detection
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1 A Software Tool for Network Intrusion Detection 4th Biennial Conference Presented by: Christiaan van der Walt Date:October 2012
2 Presentation Outline Need for intrusion detection systems Overview of attacks Illustration of network traffic for various attacks Simulation of data Description of NetID Algorithm Illustration of NetID Software Tool Future Work CSIR 2012 Slide 2
3 The Need for Network Intrusion Detection Systems Online services and security of data Serve content -> serve applications Online services include internet banking, e-commerce, video streaming, Gmail Data services include Dropbox, Google Docs, Google Drive Threats: hacking, Denial of Service (DoS) attacks Victims of DoS attacks include Yahoo, ebay, e-trade, CNN Distributed DoS attacks Why another software tool? CSIR 2012 Slide 3
4 Types of DoS attacks Consumption of computational resources bandwidth, disk space, processor time Disruption of configuration information routing information Disruption of state information unsolicited resetting of TCP connections Obstructing communication media users and victim can t communicate adequately CSIR 2012 Slide 4
5 Commonly used attacks TCP SYN (Neptune) flooding attack More than 90% of DoS attacks use the TCP protocol SYN flood is the most commonly-used TCP attack Exploits the limitation of the three-way hand shake, that maintains half-open connections for a certain time period Neptune - SYN flood denial of service on one or more ports CSIR 2012 Slide 5
6 Commonly used attacks ICMP (Smurf) attack Use spoofed broadcast ICMP echo (ping) messages Sends spoofed ping messages (spoof ip address so that it seems the victim of the attack is sending them) The network to which these ping requests are sent, then forwards these requests to all hosts in the network and each of them respond with an echo reply, thus multiplying the traffic by the number of hosts Teardrop attack Exploits the flaw in the implementation of TCP/IP stacks that can not handle overlapping IP fragments Sends mangled IP packets with overlapping IP fragments, and large payloads to victim of attack CSIR 2012 Slide 6
7 What do DoS Attacks Look Like? Figure: Network packet rate for different attacks CSIR 2012 Slide 7
8 Approaches to detecting DoS flooding attacks Adaptive threshold algorithms Monitor the traffic flow (number of packets per second), in case of SYN flood, they monitor the SYN packet rate When packet rate exceeds a threshold a possible intrusion is flagged Threshold is adapted to account for daily and weekly variations, typically make use of mean packet rate of recent traffic Change-point detection algorithms Based on hypothesis testing for iid data Continually estimate a statistical distribution of network traffic, and test whether the change in distribution is statistically significant CSIR 2012 Slide 8
9 Algorithm Development Make use DARPA Intrusion Detection Evaluation Data generated by MIT The simulated the following DoS attacks CSIR 2012 Slide 9
10 Data Simulation Setup CSIR 2012 Slide 10
11 NetID Online Detection Algorithm Detect attacks in real-time (is capable of scanning 4 hours of data in a few minutes) High detection accuracy and fast detection time (< 5 seconds) Performs change detection via an advanced statistics adaptive threshold algorithm Algorithm Specify sampling rate (typically 5ms) Arrival times of network packets are converted to packet rate (packets per sampling rate) Specify window length (typically 80s) Estimate the probability density function (PDF) of the data in the time window starting at time t Specify a window step size (typically 2.5s) Move the samples in the window to time t + step_size Estimate the PDF of window t + step_size Calculate the change in distribution Test if change > threshold CSIR 2012 Slide 11
12 Simulation results Smurf Attack 1 CSIR 2012 Slide 12
13 Simulation results Neptune Attack 1 CSIR 2012 Slide 13
14 Simulation results Smurf Attack 2 CSIR 2012 Slide 14
15 NetID Software Tool (Illustration) CSIR 2012 Slide 15
16 Operator Controls Figure: Operator Tools Figure: Parameter settings CSIR 2012 Slide 16
17 Future Work Add more intrusion detection algorithms to NetID Software Investigate more attacks and their detection performance Simulate our own attacks (possibly from within NetID Software) Further develop the analysis tools for NetID CSIR 2012 Slide 17
18 Thank you
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