Snort by SecArmour
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This document discusses different types of intrusion detection systems including network intrusion detection systems like Snort, host intrusion detection systems like OSSEC, and distributed intrusion detection systems. It provides an introduction to Snort, describing what it is, where it came from, and its architecture. It also covers Snort addons, deployment options, rule categories and options, and concludes with a brief overview of the open source host-based intrusion detection system OSSEC.
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Snort
Snort is an open source network intrusion detection and prevention system that monitors network traffic and compares it against a ruleset to detect anomalous activity. It works on the network, transport, and application layers to analyze packet headers, payloads, and apply detection rules using a string matching algorithm. Snort includes components like a packet decoder, preprocessors, detection engine, and output modules. The detection engine applies rules to packets in priority order to detect known intrusions based on signatures as well as potential new attacks. Improving Snort involves optimizing its rule processing, offloading work to hardware, and developing better detection algorithms.
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This document provides an overview and implementation guide for Snort, an open source intrusion detection and prevention system (IDPS). It discusses what Snort is, how it works, and how to install and configure it on an Ubuntu server. The key points covered include:
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Network Security Monitoring (NSM) involves collecting, analyzing, and escalating indications and warnings to detect and respond to intrusions. Security Onion is an open source NSM platform that includes intrusion detection using Snort and Suricata, network analysis tools like Bro and ELSA, and the OSSEC host-based intrusion detection system. It also includes the Sguil, Snorby, and Xplico tools for security information and event management. The demonstration showed setting up Security Onion in a test environment and reviewing configurations, as well as detecting attacks.
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This document provides an overview and implementation guide for Snort, an open source intrusion detection and prevention system (IDPS). It discusses what Snort is, how it works, and how to install and configure it on an Ubuntu server. The key points covered include:
- Snort can operate as a network intrusion detection system (NIDS), packet logger, or intrusion prevention system (IPS) through inline mode.
- Configuring an Ubuntu server, installing prerequisites like libpcap and PCRE libraries, and downloading/compiling the latest version of Snort from source.
- Creating directories, configuration files, rules files and setting permissions for Snort to run properly.
- Additional tools
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- Snort is an open source network intrusion detection system (IDS) that was created in 1998 and has continued to evolve, with a focus on detection capacity, speed and output plugin functionality.
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- Output is configured through plugins to perform actions like logging to files or databases. Signatures use a standardized language to define common network attacks and anomalies.
- Unified log files were created to offload alerting from Snort to other applications, improving performance for detection. Compatible spool readers like Barnyard and Mudpit can
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Snort by SecArmour
- 2. Intrusion Detection & Analysis
- 3. Intrusion Detection System • Network Intrusion Detection System – Example: Snort • Host Intrusion Detection System – Example: OSSEC • Distributed Intrusion Detection System
- 4. Introduction To Snort • What is Snort? – Snort is a multi-mode packet analysis tool • • • • Sniffer Packet Logger Forensic Data Analysis tool Network Intrusion Detection System • Where did it come from? – Developed out of the evolving need to perform network traffic analysis in both real-time and for forensic post processing
- 7. Data Flow Snort Packet Decoder Preprocessor (Plug-ins) Data Flow Packet Stream Sniffing Detection Engine (Plug-ins) Output Stage (Plug-ins) Alerts/Logs
- 8. Snort Addons • • • • • • • • SnortSnarf Snortplot.pl Swatch ACID BASE Demarc Razorback Incident.pl
- 9. Deployment • Monitor Internet Internal Network IDS • Inline Internal Network {IDS} Internet
- 10. Deployment Continued • Good Thumb Rule – One Inside The Router – One Inside each Subnet • Switched Network – SPAN PORT
- 11. Rules • In snort we can use following options: – – – – – Alert Log Pass Activate Dynamic • Snort Inline Mode provide some extra options like: – Drop – Reject – sdrop
- 12. Category Of Rule Options • General – Example: msg:”Login attempt”; • Payload – Example: content:”GET”; • Non-Payload – Example:ttl:<=5; • Post Detection – Example:activates:1;
- 13. OSSEC • OSSEC is an open source host-based intrusion detection system. • It performs following activity: – Log Analysis – File integrity – Policy Monitoring – Rootkit Detection – Real Time Alert
- 14. DEMO!!