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IPS Signatures

Half-open SYN Attack

 
Signature ID: 3050/0
Original Release:S1
Release:S636 (download)
Original Release Date:2000 November 27
Latest Release Date:2012 March 28
Default Enabled:True
Default Retired:False
CVE:CVE-2012-3073
Alarm Severity:High
Fidelity:100 

Description

Triggers when multiple TCP sessions have been improperly initiated against a TCP port. This is indicative that a denial of service attack against your network may be in progress.The signature alerts on 5000 (configurable) embryonic connections to a service.This signature will function in both promiscuous and in-line modes.

Recommended Filter

No recommended filters.

Benign Triggers

There are no known sources that would legitimately generate this traffic pattern. This may be indicative of some type of network problem and should be investigated.

IntelliShield Alerts

Download

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

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THE INFORMATION ON THIS PAGE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION CONTAINED HEREIN, OR MATERIALS LINKED FROM THE DOCUMENT, IS AT YOUR OWN RISK. INFORMATION IN THIS DOCUMENT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
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