IPS Signatures

TCP SYN Host Sweep

 
Signature ID: 3030/0
Original Release:S2
Release:S2 (download)
Original Release Date:2001 February 02
Latest Release Date:2001 February 02
Default Enabled:True
Default Retired:False
CVE:CVE-2003-0533
Alarm Severity:Informational
Fidelity:85 

Description

This signature fires when a series of TCP SYN packets have been sent from one single host to a number of different hosts. This could, for example, be an attempt to map the network. This is indicative that a reconnaissance sweep of your network may be in progress. This may be the prelude to a more serious attack.

Recommended Filter

Exclude internal networks as sources.

Benign Triggers

Host sweep signatures 3030 and 3032 detect behaviors that should not be observed from sources outside the local network but are normal behaviors for sources from within the local network.

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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