Evil Twin Wireless Access Point Attack
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1 Evil Twin Wireless Access Point Attack 1 Evil Twin Wireless Access Point Attack Submitted to Dr. Stephan Robila CSIT 520 Network Security By Dan Ginsberg Department of Computer Science Montclair State University Spring 2015
2 Evil Twin Wireless Access Point Attack 2 Abstract Evil Twin Wireless Access Point Attack discusses a type of man in middle attack. Instead of pursuing a more traditional route, like obtaining access to a network to implement DNS poisoning, an Evil Twin wireless access point broadcasts an enticing or otherwise misleading WiFi network for unwitting users to join. Once unsuspecting users are connected to the Evil Twin wireless access point (WAP), their traffic can be inspected, modified and logged. Utilizing ettercap, SSLStrip, and relying on user ignorance, even SSL encrypted traffic falls prey to this attack. The attack is complex in terms of its complexity, yet it is simple to implement, and does not require very expensive hardware, only proximity and patience on the part of the hacker. An overview of the technology, procedures for implementation, and preventive measures are addressed.
3 Evil Twin Wireless Access Point Attack 3 INTRODUCTION WiFi is a useful technology that has been rapidly expanding for years and is now prevalent almost everywhere we go. It allows users and their devices to easily and wirelessly access the internet. Despite the reliance on this technology that has emerged in recent years, the average user is unaware of how it works and unaware of the many security vulnerabilities they subject themselves to when using it. While great advances have been made to protect wireless communications, such as WEP, WPA2, and WPS, the reality is that they are still all breakable. Further, they only work to secure the information traveling between the user s device and the WAP. The Evil Twin WAP attack provides the hacker a method for obtaining sensitive user information. Instead of targeting and hacking a wireless access point to infiltrate a network, the hacker simply tricks the user into connecting to a malicious network. An average user is unaware of what occurs when they connect to a wireless network. They know enough to determine something is wrong if their desired website does not load. However, even if their sites do not load, they usually assume their hardware is at fault and proceed to restart their routers. There is ample room to exploit these situations. In practice, it does not take a very elaborate plan to steal information. Furthermore, suspicion on the part of the user is usually kept at bay. In addition to uninformed users, WiFi devices are usually configured to auto connect to open or known networks. This combination of predictable human behaviour and the use of protocols that are easily trusted results in a very exploitable attack vector.
4 Evil Twin Wireless Access Point Attack 4 BACKGROUND The objective of this research is to identify a method for obtaining user credentials through a wireless man in the middle attack. During the initial research and development phase, several tools that simplified the implementation of the man in the middle attack were identified, and the original plan relied heavily on the user being oblivious to security and threats. An example of one type of threat would be the appearance of a fake version of Facebook at a x.x address space or a remembered password field being blank. This would have also required downloading the latest versions of several common websites like Google, Bing, Facebook, Twitter, LinkedIn and Fantasy Baseball and then running modified versions of each of those pages to return the form input to a database running locally through an Apache Web Server and MySQL. While researching the above implementation, it was discovered that the software, Ettercap, in conjunction with SSLStrip could more effectively capture the credentials of a victim from any website they visit, instead of the few sites that would have been modified originally. These tools also do a far better job of making the entire attack less noticeable and more transparent to the victim. Even going so far as adding a favicon lock icon to make the users think the session is secure. Outlined below are the original and implemented Plan of Attack. INITIAL PLAN 1. Find an open network, or crack the password of a secure network using Aircrack ng. 2. Broadcast an imposter SSID with the same credentials so users connect to me unknowingly. 3. Utilize the original router as an internet connection.
5 Evil Twin Wireless Access Point Attack 5 4. Redirect desired URLs to my local web server running a fake copy of a login page, capture username & password. 5. Redirect user to actual desired login page. IMPLEMENTED PLAN 1. Broadcast enticing ESSID (Ex Free WiFi, or one being requested by a nearby device) using airbase ng 2. Utilize Ettercap and SSLStrip to force a client into http from https and grab plaintext usernames and passwords from form submits. 3. Connect the clients out to the internet so they do not suspect anything is wrong. THE TOOLS These are the key technologies involved in the execution of this Evil Twin attack. The basic purpose of the tools are defined here, details like parameters will be outlined below in the implementation section. ALFA AWUS036NHA USB WiFi ADAPTER This piece of hardware is renown throughout the security and penetration testing industry for its affordable price, robust feature set, and Linux driver compatibility. This is also one of the few wireless cards on the market capable of both Monitor mode and Master mode. Monitor mode allows inspection of wireless traffic without being associated with the access point; this is useful for packet sniffing. Master mode is the key feature needed for our Evil Twin attack. It allows the adapter to act as wireless access point and provide network services to clients that connect.
6 Evil Twin Wireless Access Point Attack 6 AIRBASE NG Airbase ng is multi purpose tool aimed at attacking clients as opposed to the Access Point (AP) itself. [1] This is used to broadcast the ESSID the clients will connect to. It will create a tap interface (at0) that is used to receive decrypted packets and send encrypted ones. This is a loud application which can interfere with other networks on the same channel. As such, it has features to filter and limit its activity to better suit individual environments and requirements. ETTERCAP A powerful and flexible tool for man in the middle attacks. It supports active and passive dissection of many protocols (even ciphered ones) and includes many features for network and host analysis. [5] This is the tool that will be responsible for credentials as they come through as well as passing the https traffic to SSLStrip for decryption. SSLSTRIP This is one of the most pivotal elements of the attack, sslstrip is a MITM tool that implements Moxie Marlinspike's SSL stripping attacks. [6] This tool forces HTTPS sessions to HTTP which in turn causes otherwise encrypted private form submissions to be exposed. It also adds the lock favicon associated with an HTTPS session to the URL bar to make users think the session is secure. IMPLEMENTATION This section will provide commentary along with screenshots detailing each step of the attack from initial configuration to obtaining usable results. The first step is to identify the
7 Evil Twin Wireless Access Point Attack 7 environment: both what is being broadcasted in the air as well as what hardware is available for use. In this case the guest OS, Kali Linux, has access to the internet via gateway on the virtual bridged interface, eth0. Running airmon ng will display the available wireless adapters. The Alfa USB Antenna is available as interface wlan0. Here the DHCP server is configured. This configuration will be used by the victims connecting to the Evil Twin WAP.
8 Evil Twin Wireless Access Point Attack 8 The next step is to place the wireless interface into monitor mode. This allows the interface to see all traffic sent from a wireless network, even without being associated with a WAP.
9 Evil Twin Wireless Access Point Attack 9 Above, errors are encountered. After some time troubleshooting, the value of reading warnings is learned. The above message about processes that could cause trouble proves accurate. Below, NetworkManager is killed airbase launches successfully. Airbase is used to broadcast a wireless network. In this example, a single ESSID of freewifi is set to broadcast on channel 11 via mon0.
10 Evil Twin Wireless Access Point Attack 10 My ifconfig & iptables configuration, passing the connection to the appropriate interface to allow SSLStrip to receive it. In order to launch the DHCP server, first a configuration needs to be binded to an interface. Use cf to point it to the configuration file created earlier. Then use pf to bind it to the at0 interface process. It will report back that it is listening and sending data. Then, start the actual DHCP server.
11 Evil Twin Wireless Access Point Attack 11 Configuring SSLStrip, enable the replacement favicon with a lock picture (this tricks users) with f. The p parameter enables logging of only SSL POSTs, and k defines which port for SSLStrip to listen on. p disables promiscuous mode, this narrows ettercaps filtering and only looks at packets traveling over the defined interface. u Prevents Ettercap from disabling kernel IP Forwarding. T Text format, dumps everything formatted with printf q Quiet mode; don t display everything, write it to a log file. i Specify an interface, in this case, the tap interface at0
12 Evil Twin Wireless Access Point Attack 12 Airbase reports that a device has connected to the the ESSID set earlier, freewifi The DHCP server then reports that a device has requested an address, and it is given a valid IP from the pool. When the victim submits a form on a website, SSLStrip sees the submission and displays the username and password. They have been blurred out for anonymity, however these results are in cleartext and valid. The victim has now submitted their credentials for what they believed was a secure website login. Their credentials are now passed to the website and they are successfully logged in, unaware of any Man in the middle interference. PREVENTATIVE MEASURES The most valuable preventative measure is user education and awareness. Once users know Evil Twins exist and understand how they work, they will be better able to defend themselves against the attacks. WiFi devices utilize passive and active listening to conveniently and automatically connect to known networks; in order to do this, these devices ask send request beacons by name. An attacker can see these beacon requests and customize the Evil Twin to answer with the correct SSID. As such, users should disable devices from automatically
13 Evil Twin Wireless Access Point Attack 13 connecting to known networks. Users should also be vigilant and not intentionally connect to a known network when outside that networks range; like a home network when on vacation. Never assume a public wifi hotspot is safe; they could just as easily be Evil Twins as well. When using these networks, be cautious about sending sensitive information. In addition to these awareness factors, there are tools that can aid in protection. Here are two solutions that should be easy enough to implement. They may result in a less seamless user experience when under attack, but that is an acceptable price to pay for a chance at protecting sensitive credentials. MULTI FACTOR AUTHENTICATION The RSA SecurID is a formidable tool designed to combat against these attacks. Of course, credentials will still be compromised, but access to their respective pages will not necessarily be breached. This will defend against an Evil Twin passively logging credentials for use at a later point, however if a hacker is actively watching and waiting, or produces a script that is, they will capture the RSA fixed interval authentication code, and could access the account immediately and possibly remove the multi factor authentication. HTTPS EVERYWHERE This browser plugin is another great tool to try to enable a secure browsing session. It forces HTTPS whenever a website offers it as a service, and can be configured to not transmit data if the secure link is compromised or never established. This will ultimately prevent Evil Twin MiTM attacks that are using SSLStrip. Due to the non standard nature of the internet, some pages may not load as desired, and whitelist rules may need to be added for others.
14 Evil Twin Wireless Access Point Attack 14 FUTURE RESEARCH My personal research has already exceeded the initial scope of my project and I have now modified my focus. My initial goal of serving a fake login page via an apache server quickly developed into using ettercap and SSLStrip, a much more elegant approach. I will now continue my research utilizing a WiFi Pineapple by Hak5. It is a very powerful device that ties together some of the most renown hardware in the hacking and penetration testing community. Frankly, the Pineapple takes these tasks outlined in my research, expands upon their functionality, and trivializes the implementation of attack. They are also compact, can function off a portable battery pack, are inconspicuous and can easily be used with a high gain YAGI omni directional antenna for implementing these and other attacks from a distance. Future research will involve experimenting with the other possible man in the middle attacks utilizing the WiFi Pineapple. CONCLUSION An Evil Twin attack does not require expensive nor highly specialized hardware, and the software is open source and freely available. The large community that is made up of security specialists and penetration testers have been developing and fine tuning these tools for several years. There are also hundreds of pages of support documentation available. That is to say, this attack is a very real threat in malicious hands, as well as very easy to implement. Therefore, it does not require years of specialized training. Users should think before they connect to free or open networks. Users should also be cautious about connecting to known and secure WAPs. Again, WEP and WPA2 are easy to crack. Those same credentials can be used on an Evil Twin to further convince a user the network is safe WiFi is an effective technology for easy and wireless access to IP based networks. However, this convenience comes
15 Evil Twin Wireless Access Point Attack 15 at the cost of security, and often leads to user complacency. This Evil Twin exploits complacent and uneducated users by tricking them into connecting to the wrong network. This attack sidesteps the requirement of cracking a secure network. Once a user is connected, the use of SSLStrip breaks the HTTPS encryption process and allows for the capture of sensitive user information like passwords and even credit card numbers. Efforts have been made in protecting wireless communications by securing the information traveling between a user s device and the WAP and between the user s browser and a web server. The Evil Twin WAP attack easily circumvents both of these aspects of security. The rapid growth and implementation of WiFi across networked devices, including everything under the title, The Internet of Things further exacerbates the situation. Users transmit sensitive and personal information from their devices constantly. They need to become educated about the dangers associated with wireless technologies and remain vigilant when using them.
16 Evil Twin Wireless Access Point Attack 16 REFERENCES [1] "Aircrack ng." Airbase ng N.p., n.d. Web. 10 May from ng.org/doku.php?id=airbase ng [2] "Evil Twin Tutorial." Information Treasure. N.p., 25 July Web. 10 May from twin tutorial/ [3] J. Broad, A. Binder. (2003). Hacking with Kali: Practical Penetration Testing Techniques [4] "Man in the middle Attack." Wikipedia. Wikimedia Foundation, Web. 10 May from in the middle_attack [5] Manual Reference Pages ETTERCAP, Web. 10 May 2015 from 3 man/ettercap [6] "Moxie0/sslstrip." GitHub. N.p., n.d. Web. 10 May from
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