IPS50SL08.ppt - Lesson 8 Configuring Signatures 2005 Cisco...

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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-1 Lesson 8 Configuring Signatures
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-2 Parameters Common to All Signature Engines
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-3 Common Parameters Signature ID Signature Name SubSignature ID Specify Alert Interval Alert Severity User Comments Alert Notes Alert Traits Release Event Count Event Count Key Sig Fidelity Rating Promiscuous Delta Sig Description Event Counter Engine
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-4 Common Parameters (Cont.) Summary Mode Summary Interval Summary Key Specify Global Summary Threshold Enabled Retired Alert Frequency Status
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-5 Key Terminology A = source address a = source port B = destination address b = destination port x = does not matter AxBx = The source and destination addresses matter, but the source and destination ports do not.
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-6 Summary Modes You can use the value of the common Parameter Summary mode to control the number of alarms generated by a specific signature. The Summary Mode parameter can have one of the following values: Fire once Fire all Summarize Global summarize
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-7 FireAll Summarize Summary Threshold Global Summary Threshold Summarize Global Summarize Global Summarize Summary Interval Summary Mode Threshold Parameters and Automatic Alarm Summarization Automatic alert summarization enables a signature to change alert modes automatically based on the number of alerts detected within the Summary Interval parameter.
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-8 Signature Tuning
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-9 Signature Tuning Configuration Signature Definition Signature Configuration Edit
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-10 Signature Tuning Scenario 1 A company FTP server stores software that is being beta tested by customers. The company wants to detect unauthorized login attempts. Using the signature search features in the IDM, the network security administrator discovers signature 6250, the FTP Authorization Failure signature. After examining the parameters for signature 6250, the administrator decides to tune the signature as follows: Change the severity level from informational to high Add the Deny Connection Inline action to the default action of Produce Alert
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-11 Signature Tuning Scenario 1 (Cont.) Alert Severity Event Action
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—8-12 Signature Tuning Scenario 2 You are replacing D-Link devices on your network with Linksys wireless devices, but you still have some old D-Link systems that have not yet been replaced. Until they are replaced, you want to make sure that they are not being attacked. You would like to do
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