Intrusion Detection Systems
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1 Intrusion Detection Systems Raj Jain Washington University in Saint Louis Saint Louis, MO Audio/Video recordings of this lecture are available at:
2 Overview Concepts Intrusion vs. Extrusion Detection Types of IDS Host vs. Network IDS Protocols for IDS: Syslog, BEEP, IDXP 23-2
3 Concepts Intrusion: Break into, misuse, or exploit a system (against policy) Intruders: Insiders or outsiders Most IDS are designed for outsiders Vulnerability: Weakness that could be used by the attacker Threat: Party that exploits a vulnerability Structured Threat: Adversaries with a formal methodology, a financial sponsor, and a defined objective. Unstructured Threat: Compromise victims out of intellectual curiosity 23-3
4 Intrusion vs. Extrusion Detection Intrusion Detection: Detecting unauthorized activity by inspecting inbound traffic Extrusion Detection: Detecting unauthorized activity by inspecting outbound traffic Extrusion: Insider visiting malicious web site or a Trojan contacting a remote internet relay chat channel 23-4
5 Notification Alarms False Positive: Valid traffic causes an alarm False Negative: Invalid traffic does not cause an alarm Probability Normal Abnormal False Negatives 23-5 Activities False Positives
6 Types of IDS Sensors Log analyzers: Matching log entry Action Signature based sensors System call analyzers: Shim between applications and OS Application behavior analyzers: E.g., web server writing a file File Integrity checkers 23-6
7 Types of IDS IDS Sensor: SW/HW to collect and analyze network traffic Host IDS: Runs on each server or host Network IDS: Monitors traffic on the network Network IDS may be part of routers or firewalls Manager Host Based Network Based IDS Agent Agent Agent WWW Mail DNS 23-7
8 Host vs. Network IDS 23-8
9 Types of IDS (Cont) Signature Based IDS: Search for known attack patterns using pattern matching, heuristics, protocol decode Rule Based IDS: Violation of security policy Anomaly-Based IDS Statistical or non-statistical detection Response: Passive: Alert the console Reactive: Stop the intrusion Intrusion Prevention System Blocking 23-9
10 Signature Based IDS 5-tuple packet filtering (SA/DA/L4 protocol/ports) Use Ternary Content Addressable Memories (TCAMs) Deep packet inspection requires pattern string matching algorithms (Aho-Corasik algorithm and enhancements) Regular expression signatures 23-10
11 Types of Signatures Ref: Sasdat Malik's book 23-11
12 Sample Signatures ICMP Floods directed at a single host Connections of multiple ports using TCP SYN A single host sweeping a range of nodes using ICMP A single host sweeping a range of nodes using TCP Connections to multiple ports with RPC requests between two nodes 23-12
13 Anomaly Based IDS Traffic that deviates from normal, e.g., routing updates from a host Statistical Anomaly: sudden changes in traffic characteristics Machine Learning: Learn from false positives and negatives Data Mining: Develop fuzzy rules to detect attacks 23-13
14 Performance degradation Encrypted traffic Open Issues Polymorphic attacks: change their signatures Human intervention: Inconvenient and slows down Newer and Newer Attacks: Need to keep signatures updated 23-14
15 SYSLOG Protocol SYSLOG Packet Format Protocols for IDS Remote Data Exchange Protocol (RDEP) BEEP IDMEF 23-15
16 RFC 3164, August 2001 SYSLOG Protocol Designed for BSD. Now used on many OSs. Used to send event data Device: Originates event data Collector (Server): Consumes/logs/acts on event data Relay: forwards event data Sender/Receiver Uses UDP port
17 SYSLOG Packet Format 3 Parts: PRI, Header, Msg PRI = <nnn> = Facility*8+Severity Facility: 0=Kernel, 1=User-level, 2=Mail,... Severity: 0=Emergency, 1=Alert,... Header: Timestamp and Hostname MSG: Additional info Example: <34>Dec 10 22:14:15 siesta su: 'su root' failed for jain on /dev/csf/ No connection No security, integrity, reliability Reliability Syslog over TCP, RFC 3195, November
18 Remote Data Exchange Protocol (RDEP) Cisco protocol to exchange IDS events Alarms remain on the sensors until pulled by the management system Uses XML encoding for data Out-of-band or in-band communication using secure channel Ref: Joe Minieri, "RDEP Client," http: 23-18
19 BEEP Block Extensible Exchange Protocol RFC 3080, March 2001 Generic application protocol kernel for connection-oriented asynch interactions Supports both textual and binary messages Messages are arbitrary MIME content, usually XML Supports multiple simultaneous exchanges - channels Each channel has a associated profile that defines syntax and semantics Channel management profile, TLS transport security profile BEEP peer advertises the profiles it supports and later offers one of the profile for the channel 23-19
20 IDMEF Intrusion Detection Message Exchange Format RFC 4765, 4766, 4767, March 2007 Many IDS sensor vendors, Many management consoles Need standard data format and protocol Data format and exchange procedures for sharing IDS info Uses Extensible Markup Language (XML) Allows vendors to extend the definition 23-20
21 IDMEF Concepts Data Source Activity Sensor Event Sensor Event Analyzer Alert Operator Notification Response Manager Administrator Security Policies 23-21
22 IDMEF Concepts (Cont) Data source: Raw network packets, audit logs, application logs Sensor: Collects from data source and forwards to analyzer Analyzer: Analyzes the data collected by sensor Manager: Used by operator to configure sensors, analyzers, data consolidation, etc. Operator: Human user of IDS manager Administrator: Human responsible for security policies Activity: Any action - Unauthorized file access, login failure Alert: Message from analyzer to manager Event: Activity that results in an alert Notification: from manager to administrator Response: Action taken in response to an event Signature: Rule used by analyzer Security Policy: Formal document on what is allowed 23-22
23 IDXP Intrusion Detection Exchange Protocol RFC 4767, March 2007 Application level protocol for exchanging IDS data A profile of Blocks Extensible Exchange Protocol (BEEP) BEEP offers the security part using TLS or Simple Authentication and Security Layer (SASL) profiles BEEP also has a TUNNEL profile for going over proxy servers (untrusted) IDXP provides the messages for IDS data exchange Only peer-to-peer two-party communication Multi-party to multi-party communication using pair-wise connections 23-23
24 IDMEF Example: Teardrop Attack Teardrop= IP Fragments with overlapping oversize payloads <?xml version="1.0" encoding="utf-8"?> <idmef:idmef-message xmlns:idmef= version="1.0"> <idmef:alert messageid="abc "> <idmef:analyzer analyzerid="hq-dmz-analyzer01"> <idmef:node category="dns"> <idmef:location>headquarters DMZ Network</idmef:location> <idmef:name>analyzer01.example.com</idmef:name> </idmef:node> </idmef:analyzer> <idmef:createtime ntpstamp="0xbc723b45.0xef449129"> T10:01: :00 </idmef:createtime> <idmef:source ident="a1b2c3d4"> <idmef:node ident="a1b2c3d4-001" category="dns"> <idmef:name>badguy.example.net</idmef:name> </idmef:alert> </idmef:idmef-message> 23-24
25 Summary Intrusion detection systems: Host based and Network Based Analyzers can be signature based, anomaly based Syslog provides a simple efficient method for IDS data But it is not secure or reliable IDXP provides a secure, reliable method of IDS data exchange 23-25
26 References S. Kumar, "Survey of Current Network Intrusion Detection Techniques," NIST, Guide to Intrusion Detection and Prevention Systems (IDPS), Special Publication SP , Sep 2006, Open Directory Projects IDS Page, ms/ Has a list of 25 open source and 96 commercial tools, 79 security scanners, 25 security scanner services Architectural Issues of Intrusion Detection Infrastructure in Large Enterprises, SANS Institute, "Intrusion Detection FAQ," cb8de1e1ff4ae9e
27 RFCs RFC 3080 The Blocks Extensible Exchange Protocol Core, March 2001 RFC 3164 The BSD Syslog Protocol, August RFC 3195 Reliable Delivery for syslog, November RFC 4765 The Intrusion Detection Message Exchange Format (IDMEF), March RFC 4766 Intrusion Detection Message Exchange Requirements, March RFC 4767 The Intrusion Detection Exchange Protocol (IDXP), March
28 References: Books Used Gert DeLaet, Gert X. Schauwers, "Network Security Fundamentals," Cisco Press, Sep 2004, 400 pp., ISBN: Richard Bejtlich, "The Tao Of Network Security Monitoring : Beyond Intrusion Detection," Addison-Wesley, Jul 2004, 798 pp., ISBN: Richard Bejtlich, "Extrusion Detection: Security Monitoring for Internal Intrusions," Addison-Wesley Professional, Nov 2005, Paperback 416 pp., ISBN: Saadat Malik, "Network Security Principles and Practices," Macmillan Technical Pub, Nov 2002, 400 pp., ISBN: Terry Escamilla, "Intrusion Detection : Network Security Beyond the Firewall," Wiley, Oct 1998, 348 pp., ISBN:
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