GregSowell.com MikrotikUniversity.com. Rogue Access Point Detectoin and Mitigation MUM 2011
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1 Rogue Access Point Detectoin and Mitigation MUM 2011
2 Define Rogue Access Point A rogue in this instance is any access point connected to your network without permission.
3 Why Should I Care? Limited spectrum. Man in the middle attacks/information theft. Because they didn t say please.
4 Limited Spectrum b has only 3 nonoverlapping channels. 2400Mhz 2483Mhz 22Mhz channels 22 * 3 = 66Mhz for transmissions 4Mhz separation * 2 = 8Mhz = 74Mhz of the available 83Mhz
5 Man In The Middle Attack MITM happens when an attacker convinces you to proxy your traffic through him. He then steals information or directs you to false resources.
6 Man In The Middle Attack A MITM attack usually happens when an attacker uses ARP poisoning on a network.
7 Man In The Middle Attack If you are performing MITM via an attackers access point, no poisoning is necessary you are willingly sending all of your traffic. How nice of you
8 Commercial Methods Keep a list of MAC addresses and alert when a new address appears. Monitor MAC addresses looking for those that are of a wireless manufacturer.
9 Detect Rogues Basic Flow Connect to probe and run wireless scan.
10 Detect Rogues Basic Flow Parse scan for open AP s not in ignore list.
11 Detect Rogues Basic Flow Connect to open AP s.
12 Detect Rogues Basic Flow Attempt to pull a resource that only exists internally to my network. If it fails to, move to the next AP.
13 Detect Rogues Basic Flow Attempt to pull a resource that only exists internally to my network. If it successfully pulls internal resource, we have a rogue. Send alert listing what probe it came from and rogue info. Start a continuous ping from probe to internal resource.
14 Detect Rogues - Supplies Mikrotik Access Point. Preferably with a centrally located omni antenna. Windows machine. (Try to keep your booing to a minimum.) Putty. Windows SSH client. SMTP relay. Allows us to send alert s. HTTP server. Hosts a basic html page. Rogue Detect program. Newest version will be on my blog along with source code. Written in AutoIT.
15 Rogue Detect Configuration Edit config files: Ignore-list.txt Any open AP s to ignore should be in this file. Format of MAC address~ssid Probes.txt This is the list of MTK probes to connect to. Format of IPaddress~username~password. Settings.txt This has all of the program settings. Format of: scan interval, internal server addressing and settings.
16 Diagram
17 Step 1 Program starts. Connects to first probe. Scans for available APs.
18 Step 1 AP list pulled:
19 Step 2 Grab list of APs. Scan through for open APs. Ensure the open APs aren t on ignore list. Connect to AP. Release/renew DHCP address. Try and fetch rogue html page from server.
20 Rogue Diagram: Step 3
21 Step 3 Rogue Diagram Traffic Flow:
22 Step 3 Open packet sniffer. Determine IP address of sending ICMP. If on same subnet, find MAC address.
23 Step 3 IP in same subnet. Make note of MAC address.
24 Step 4 Track down MAC address. show mac-address-table. Shut down port with offending device. Pay visit to owner of AP.
25 Possible Extensions Track all APs, open and encrypted. Try company encryption on protected APs. Rewrite in portable format. Rewrite completely CLI version.
26 Completely Theoretical Extensions Get pan/tilt mount
27 Completely Theoretical Extensions Mount outdoor AP to PT.
28 Completely Theoretical Extensions Mount outdoors.
29 Completely Theoretical Extensions Connect serially controlled relays from PC to PT.
30 Completely Theoretical Extensions Create algorithm that scans for open APs and connects to each for connectivity test. Keep track of signal strength/speed test of all and connect to best. If connectivity is lost or signal degrades, automatically switch to backup APs.
31 Thanks and happy routing!
32 Resources Link To Article (Contains files) Greg s Blog Training Wikipedia Wireshark Putty
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