Approach For Mitigating The Effects Of Rogue Wireless Access Points

• US 20080186932A1
• Filed: 02/05/2008
• Published: 08/07/2008
• Est. Priority Date: 02/05/2007
• Status: Abandoned Application

• Current Assignee: Bandspeed, Inc. (Broadcom, Inc.)
• Original Assignee: Bandspeed, Inc. (Broadcom, Inc.)
• Inventors: Skafidas, Efstratios, Fesas, Nestor Alexis, Do, Duy Khuong, Willman, Charles Arthur, Gibson, Michael Clark
• Application Number:
  US12/026,520
• Publication Number:
  US 20080186932A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 63/126 the source of the received data
• CPC Class Codes: H04W 12/08 Access security
• CPC Class Codes: H04W 12/122 Counter-measures against attacks; Protection against rogue devices

Abstract

According to an approach for mitigating the effects of rogue WAPs in wireless local area networks, a determination is made of one or more clients that are communicating with a rogue WAP. For example, messages may be intercepted and examined to identify messages that are sent by or to rogue WAPs. Information that identifies the one or more clients is then extracted from the messages and stored in a client list. Communications between the one or more clients and the rogue WAP are then disrupted. Embodiments of the invention include, without limitation, disrupting communications using deauthentication and by spoofing Address Resolution Protocol (ARP) responses.

Claims

1. A computer-implemented method for mitigating the effects of rogue wireless access points (WAPs) in a wireless local area network, the computer-implemented method comprising:

determining one or more clients communicating with a rogue WAP; and

disrupting communications between the one or more clients and the rogue WAP.

2. The computer-implemented method of claim 1, wherein the determining one or more clients communicating with a rogue WAP further comprises:

monitoring one or more communications channels that carry communications data between WAPs and clients;

monitoring one or more communications channels that carry communications data between a node in the wireless local area network and a client accessing the wireless local area network via the rogue WAP;

receiving data exchanged between the rogue WAP and the client;

receiving data exchanged between the client accessing the wireless local area network via the rogue WAP and the node in the wireless local area network;

extracting address information from the received data; and

determining that the address information corresponds to the rogue WAP.

3. The computer-implemented method of claim 2, wherein the disrupting communications between the one or more clients and the rogue WAP is performed in response to receiving the data exchanged between the rogue WAP and the client.

4. The computer-implemented method of claim 2, wherein the extracting address information from the received data further comprises determining a BSSID field, an SA field, a DA field and a data field in the address information.

5. The computer-implemented method of claim 2, further comprising:

determining whether the received data represents a management frame;

if the received data represents a management frame, then;

determining whether the management frame corresponds to an associate or reassociate request,

if the management frame corresponds to the associate or reassociate request, then;

extracting an SA value from an SA field in the received data, and

storing the SA value in association with the rogue WAP,

determining whether the management frame corresponds to an associate or reassociate response,

if the management frame corresponds to the associate or reassociate response, then;

extracting an DA value from a DA field in the received data, and

storing the DA value in association with the rogue WAP.

6. The computer-implemented method of claim 2, further comprising:

determining whether the received data represents a data frame;

if the received frame is the data frame, then;

determining whether the address information in the data frame contains an SA field,

if the address information in the data frame contains the SA field, then;

extracting an SA value from the SA field, and

storing the SA value in association with the rogue WAP,

determining whether the address information in the data frame contains an DA field,

if the address information in the data frame contains the DA field, then;

extracting an DA value from the DA field, and

storing the DA value in association with the rogue WAP.

7. The computer-implemented method of claim 1, wherein the disrupting communications between the one or more clients and the rogue WAP further comprises generating and transmitting a deauthentication message to cause at least one client from the one or more clients to be deauthenticated.

8. The computer-implemented method of claim 1, wherein the disrupting communications between the one or more clients and the rogue WAP further comprises periodically transmitting a deauthentication message to cause at least one client from the one or more clients to be periodically deauthenticated.

9. The computer-implemented method of claim 1, wherein the disrupting communications between the one or more clients and the rogue WAP further comprises generating and transmitting a unicast deauthentication message having a sending address that corresponds to the rogue WAP and a destination address that corresponds to at least one client from the one or more clients.

10. The computer-implemented method of claim 1, wherein the disrupting communications between the one or more clients and the rogue WAP further comprises generating and transmitting a broadcast deauthentication message having a sending address that corresponds to the rogue WAP.

11. The computer-implemented method of claim 1, wherein the disrupting communications between the one or more clients and the rogue WAP further comprises generating and transmitting a unicast deauthentication message having a sending address that corresponds to a particular client from the one or more clients and a destination address that corresponds to the rogue WAP.

12. The computer-implemented method of claim 1, wherein the disrupting communications between the one or more clients and the rogue WAP further comprises generating a transmitting a unicast deauthentication message having a sending address that corresponds to a particular client from the one or more clients and a destination address that corresponds to the rogue WAP.

13. The computer-implemented method of claim 1, wherein disrupting communications between the one or more clients and the rogue WAP includes generating and transmitting to the rogue WAP one or more messages containing incorrect length values.

14. The computer-implemented method of claim 1, wherein disrupting communications between the one or more clients and the rogue WAP includes generating and transmitting to the rogue WAP one or more messages containing CRC errors.

15. The computer-implemented method of claim 1, wherein disrupting communications between the one or more clients and the rogue WAP includes generating and transmitting to the rogue WAP one or more Ethernet packets containing errors in a destination address or a source address.

16. The computer-implemented method of claim 1, further comprising:

intercepting an ARP request sent by a client accessing the network via the rogue WAP; and

generating and transmitting to the client an ARP response in reply to the ARP request, wherein the ARP response contains a MAC address value that is not the MAC address corresponding to the destination IP address contained in the ARP request.

17. A computer-readable medium for mitigating the effects of rogue wireless access points (WAPs) in a wireless local area network, the computer-readable medium carrying instructions which, when executed by one or more processors, cause:

determining one or more clients communicating with a rogue WAP; and

disrupting communications between the one or more clients and the rogue WAP.

18. An apparatus for mitigating the effects of rogue wireless access points (WAPs) in a wireless local area network, the apparatus comprising a memory storing instructions which, when executed by one or more processors, cause:

determining one or more clients communicating with a rogue WAP; and

disrupting communications between the one or more clients and the rogue WAP.

19. An apparatus for mitigating the effects of rogue wireless access points (WAPs) in a wireless local area network, the apparatus comprising:

means for determining one or more clients communicating with a rogue WAP; and

means for disrupting communications between the one or more clients and the rogue WAP.