Zero window probe

Hi all

I saw zero Windows Probe events and its default action says 'change the package '. Please let me know what will be the exact action taken by IPS that I need to understand it perfectly. Please guide me.

Concerning

Kiran

Hello Kiran,

The action to modify the package signature line 1317.0 removes the package data probe Zero Window.

RFC 793/1122 allow no data 1 byte of data or even a package of comprehensive data in Zero-Window probe.  If the window opens while the package is in transit, the receiving end can accept data. As the IPS has no way of knowing if the data will be accepted on the receiving end or not, it deletes the data. The IPS force package as a legitimate zero window probe and remove possible ambiguity on what data have been processed. Zero window probes are not malicious. The signature exists as a way to control the behavior of the normalizer.  The behavior is necessary for the normalizer can maintain the proper workflow status.

Disabling this signature can cause the normalizer of a false positive in the following scenario:

Client server

------------------Syn>

-------------------ACK>

-ZeroWindow >

-ZeroWindow >

If the receive window opens while the ZWP package above is in flight, the customer accepts the packet normalizer will be ignored and the normalizer is out of sync with the data stream. The normalizer will begin to produce false alarms.

If the signature 1317.0 is selected, all data will be removed from the ZeroWindowProbe and there is no potential ambiguity.

Please let me know if I can help with anything whatsoever in addition under this thread. If your question has been answered, please mark the thread as such so that it is useful to other users. Also, feel free to note this thread to take account of your experience.

Thank you

Blayne Dreier

Cisco TAC team climbing

* Please see our Podcasts *.

TAC security show: http://www.cisco.com/go/tacsecuritypodcast

TAC IPS Media Series: https://supportforums.cisco.com/community/netpro/security/intrusion-prevention?view=tags&tags=tac_ips_media_series

Tags: Cisco Security

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