Wireless Network Security
Jerry Grugin
In this blog, we will be looking at wireless security. Specifically, we will be looking at five different things:
- Weak Encryption = WEP
- SSID Broadcast
- MAC Filtering
- Rogue Access Points
- War Driving, Bluejacking, and BlueSnorting
Wireless was designed to be very promiscuous. The early standard of authentication had two forms of authenticating devices: There was Open System. This is basically where if you come in range you are connected. Wireless communications was to extend to the masses this thing we call connectivity. It was designed to be an open system. The other type of authentication is shared key. Shared key is just where one person puts in a password and then the administrator on the access point puts in a password. These passwords or "keys" are called static WEP keys. The name WEP gave people a false sense of security. There is nothing secure about wired equivalent privacy. The goal was to have equivalent privacy to wired networks, but the problem is that there are some major inherent weaknesses with WEP.
For encryption, we have four types of encryption for wireless communications. We have WPA, WPA2, WEP 64 bit, and WEP 128 bit. We do not want to use WEP 64 bit. At home, it is OK to use WEP 128 bit. However, if we have the choice, it is better to use WPA. Even better is WPA2. This is the wifi standard. It is called 802.11i or RSNA (Robust Security Network Associations).
Wireless Setup
SSID is the workgroup name. It is the workgroup of devices that will communicate with the access point. You want to change the SSID name to something that is not the vendor supplied SSID. We are given the choice to hide or not hide the name of the SSID from being broadcasted. We want to hide the SSID from being broadcasted. However, choosing not to broadcast the SSID gives us a false sense of security. We need to be aware that the SSID will still be communicated in other transmissions to other devices and the SSID can still be pulled out of the air with Aeropeak.
Under profile, it is basically asking what type of .11 someone is using. The one that is used most often is 11g because it is backwards compatible and it gives you up to 52 megabit per second of theoretical bandwith. The passphrase should be a strong password. Strong passwords were covered in another blog.
MAC Filtering
We want to go through our business or system and only allow certain MAC addresses. You are going to name them or give them some type of label and then manually configure the MAC addresses of all the systems. The result is that only those MAC addresses will be able to authenticate to the switch port. Again, this provides a false sense of security because there are programs out there that can spoof MAC addresses or that can change MAC addresses.
You want to be aware of any rogue device or any unauthorized device on your network. With rogue access points you can have it connected to your laptop and do wireless sniffing and scanning in a corporate environment. This is what an attacker would do. A rogue access point is small and can be obtained for 60 dollars or less. A rogue device is anything that is unauthorized.
Wardriving
Driving through different areas and finding open access points. You are looking for people who are using null authentication. You are also looking for people who are using WEP and are using default SSIDs. Wardrivers go one step further and do war chalking. They will go to the building and put down symbols that tell people that it is a null authentication point and other things. The main goal of wardriving is to gain free internet access, but it can lead to other malicious activity.
Bluejacking
This involves bluetooth. bluetooth is not compatible with 802.11. There is all different types of bluetooth technologies. They operate over the 2.4 gigahertz range. Bluejacking is sending unwanted messages over bluetooth. It is typically a harmless activity. However, there are trojan horse programs being sent to bluetooth devices.
Bluesnarfing
Illegal hacking of mobile phones using bluetooth.
Bluesnorting
A free network intrusion detection software. There are wireless versions of snort. Introducing IDS and IPS protocol analysis in a bluetooth environment.
Conclusion
In this blog, we looked at
- Weak Encryption = WEP
- SSID Broadcast
- MAC Filtering
- Rogue Access Points
- War Driving, Bluejacking, and BlueSnorting