CEH.V6.-.Module.20.Hacking.Wireless.Networks

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Unformatted text preview: ommunity community and are used mostly for personal use EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Cantenna EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Wireless Access Points An An access point is a piece of wireless communications hardware that creates a central point of wireless connectivity Similar to a “hub,” the access point is a common connection point for devices in a wireless network Wireless access points must be deployed and managed in common areas of the campus, and they must be coordinated with telecommunications and network managers EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited SSID The SSID is a unique identifier that wireless networking devices use to establish and maintain wireless connectivity An SSID acts as a single shared identifier between access points and clients Security concerns arise when the default values are not changed, as these units can be easily compromised A non-secure access mode allows clients to connect to the access access point using the configured SSID, a blank SSID, or an SSID configured as “any” EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Beacon Frames Beacon frames broadcast the SSID: • Helps users to locate available networks • Layer 2 management frames • Networks without BFs are called “closed networks”: • Simply means that the SSID is not broadcast anymore • Weak attempt at security through obscurity, to make the presence of the network less obvious • BSSIDs are revealed as soon as a single frame is sent by any member station • Mapping between SSIDs and BSSIDs is revealed by several management frames that are not encrypted EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Is the SSID a Secret Stations looking for an access point send the SSID they are looking for in a "probe request" Access points answer with a "probe reply" frame, which contains the SSID and BSSID pair Stations wanting to become part of a BSS send an association request frame, which also contains the SSID/BSSID pair in cleartext: • As do reassociation requests (see next slides) and their response Therefore the Therefore, the SSID remains secret only on closed networks with no activity Closed networks are mainly inconvenient to legitimate users EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Setting up a WLAN The channel and service set identifier (SSID) must be configured when setting up a WLAN in addition to traditional network tti WLAN settings such as IP address and a subnet mask Th The channel is a number between 1 and 11 (between 1 and 13 in (b Europe) and it designates the frequency on which the network will operate The SSID is an alphanumeric string that differentiates networks operating on the same channel It is essentially a configurable name that iden...
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This note was uploaded on 02/12/2013 for the course CEH v6 taught by Professor John during the Summer '13 term at West Point.

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