RE: wireless access point

["Christopher Harrington" <charrington () syseng com>]

There is a difference between a blank SSID and not broadcasting a SSID. Higher end AP's allow you to disable the SSID 
broadcasts. Most of the AP's I have played with allow a blank SSID to be broadcasted. Did you see a vendor on the one's 
you speak of? I would guess that you saw Belkin / Linksys / Netgear.

--Chris


-----Original Message-----
From: Myers, Marvin [mailto:MRMyers () anteon com] 
Sent: Friday, June 06, 2003 2:34 PM
To: Christopher Harrington; lod () acmesecurity org; security-basics () securityfocus com
Subject: RE: wireless access point


That is not entirely true. Netstumbler does in fact detect AP's that do not broadcast their SSID, it just takes longer. 
I have proven this on more than one occasion using NetStumbler on XP with both Orinoco and Netgear cards.

-----Original Message-----
From: Christopher Harrington [mailto:charrington () syseng com] 
Sent: Friday, June 06, 2003 1:23 PM
To: lod () acmesecurity org; security-basics () securityfocus com
Subject: RE: wireless access point

Netstumbler does not detect AP's that do not broadcast their SSID. I know Kismet and Wellenreiter do, I cant speak for 
the others.

--Chris


-----Original Message-----
From: Luiz Otávio Duarte [mailto:lod () acmesecurity org] 
Sent: Thursday, June 05, 2003 9:54 PM
To: security-basics () securityfocus com
Subject: RE: wireless access point


Hi,

> Is there any way of detecting wireless access point that doesn't
> broadcast
> the SSID?

Yep, It's possible. I will tell you why:

   We have two probing modes for channels in a 802.11 network.

  - Activing probe - Is when the prober machine exchange some probe frames 
with the AP.

  - RFMON - Radio Frequency Monitor (Passive probe) - when the probe machine 
capture all data in the channel and try to find some SSID (Service Set 
Identification)

  You can find AP that does not broadcast the SSID using any probe technique.

  You can use: Netstumbler, DStumbler, Kismet, Wellenreiter, THC-RUT, 
WEPCrack, AirSnort, .... 

That's All Folks! 

-- 
##
# Luiz Otávio Duarte (lod at acmesecurity dot org)
# www.acmesecurity.org/~lod
##
# ACME! (Computer Security Research)
# www.acmesecurity.org
##
# Unesp - São José do Rio Preto - São Paulo - Brazil
##

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