CA2430571A1 - Flow-based detection of network intrusions - Google Patents

Flow-based detection of network intrusions Download PDF

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Publication number
CA2430571A1
CA2430571A1 CA002430571A CA2430571A CA2430571A1 CA 2430571 A1 CA2430571 A1 CA 2430571A1 CA 002430571 A CA002430571 A CA 002430571A CA 2430571 A CA2430571 A CA 2430571A CA 2430571 A1 CA2430571 A1 CA 2430571A1
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Canada
Prior art keywords
flow
concern index
index value
packets
host
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Granted
Application number
CA002430571A
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French (fr)
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CA2430571C (en
Inventor
John A. Copeland Iii
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Cisco Technology Inc
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Individual
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Publication of CA2430571A1 publication Critical patent/CA2430571A1/en
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Publication of CA2430571C publication Critical patent/CA2430571C/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0227—Filtering policies
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
    • G06F21/55—Detecting local intrusion or implementing counter-measures
    • G06F21/552—Detecting local intrusion or implementing counter-measures involving long-term monitoring or reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H04L63/1416—Event detection, e.g. attack signature detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols

Abstract

A flow-based intrusion detection system for detecting intrusions in computer communication networks. Data packets representing communications between hosts in a computer-to-computer communication network are processed and assigned to various client/server flows. Statistics are collected for each flow. Then, the flow statistics are analyzed to determine if the flow appears to be legitimate traffic or possible suspicious activity. A concern index value is assigned to each flow that appears suspicious. By assigning a value to each flow that appears suspicious and adding that value to the total concern index of the responsible host, it is possible to identify hosts that are engaged in intrusion activity. When the concern index value of a host exceeds a preset alarm value, an alert is issued and appropriate action can be taken.

Claims (6)

1. A method of analyzing network communication traffic for potential intrusion activity, comprising the steps of:
assigning packets to a flow;
collecting flow data from packet headers;
analyzing collected flow data to assign a concern index value to the flow based upon a probability that the flow was not normal for data communications;
maintaining an accumulated concern index from flows associated with a host;
and issuing an alarm signal once the accumulated concern index has exceeded an alarm threshold value.
2. The method of claim 1, wherein the flow consists of the packets exchanged between two hosts that are associated with a single service.
3. The method of claim 1, wherein the alarm signal updates a firewall for filtering packets transmitted by a host.
4. The method of claim 1, wherein the alarm signal generates a notification to the network administrator.
5. The method of claim 1, wherein each concern index value associated with a respective potential intrusion activity is a predetermined fixed value.
6. A method of analyzing network communication traffic for potential intrusion activity, comprising the steps of:
assigning packets to a flow wherein a flow consists of the packets exchanged between two hosts that are associated with a single service;
collecting flow data from packet headers;
analyzing collected flow data to assign a concern index value wherein each concern index value associated with a respective potential intrusion activity is a predetermined fixed value;
maintaining an accumulated concern index from flows associated with a host;
and issuing an alarm signal once the accumulated concern index has exceeded an alarm threshold value.

8. A method of analyzing network communication traffic for potential intrusion activity, comprising the steps of:
assigning packets to a flow wherein a flow consists of the packets exchanged between two Internet Protocol addresses with at least one port remains constant;
collecting flow data from packet headers;
analyzing collected flow data to assign a concern index value to the flow;
maintaining a host structure containing an accumulated concern index from flows associated with the host; and issuing an alarm once the accumulated concern index has exceeded an alarm threshold value.

9. The method of claim 8, wherein each concern index value associated with a respective potential intrusion activity is a predetermined fixed value.

10. A system for analyzing network communication traffic, comprising:
a computer system operable to classify packets into flows, collect flow data from packet header information, analyze collected flow data to assign a concern index value wherein each concern index value associated with a respective potential intrusion activity is a predetermined fixed value, and generate an alarm signal; and a communication system coupled to the computer system operable to send packets from one host to another host.

11. A system for analyzing network communication tragic, comprising:
a processor operable to classify packets into flows, collect flow data from packet header information, analyze collected flow data to assign a concern index value wherein each concern index value associated with a respective potential intrusion activity is a predetermined fixed value, and generate an alarm signal;
memory coupled to the processor operable to store the flow data;
a database coupled to processor operable to store log files; and and a network interface coupled to the processor operable to monitor network traffic.

12. A method of analyzing network communication traffic for potential intrusion activity, comprising the steps of:
analyzing packet header information;
determining a transport level protocol specifying a format of a data area ;
issuing an alarm when the transport level protocol is identified as User Datagram Protocol and the data segment associated with User Datagram Protocol packet contains two or less bytes of data.
CA2430571A 2000-11-30 2001-11-30 Flow-based detection of network intrusions Expired - Lifetime CA2430571C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US25026100P 2000-11-30 2000-11-30
US60/250,261 2000-11-30
US26519401P 2001-01-31 2001-01-31
US60/265,194 2001-01-31
PCT/US2001/045275 WO2002045380A2 (en) 2000-11-30 2001-11-30 Flow-based detection of network intrusions

Publications (2)

Publication Number Publication Date
CA2430571A1 true CA2430571A1 (en) 2002-06-06
CA2430571C CA2430571C (en) 2011-07-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2430571A Expired - Lifetime CA2430571C (en) 2000-11-30 2001-11-30 Flow-based detection of network intrusions

Country Status (7)

Country Link
US (1) US7185368B2 (en)
EP (1) EP1338130B1 (en)
AT (1) ATE344573T1 (en)
AU (2) AU2002230541B2 (en)
CA (1) CA2430571C (en)
DE (1) DE60124295T8 (en)
WO (1) WO2002045380A2 (en)

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