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Learn how to attack wireless networks

Learn about exploiting wireless networks, including protocols, Wi-Fi authentication and weak points, as well as an overview of mobile devices.

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5. MAC address (Media Access Control address) is a unique identifier assigned to network interfaces for communications on the physical network segment. It usually encodes the manufacturer's registered identification number.
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Internet is now the basic need of our daily life. With the increasing use of smartphones, most of the things are now online. Every time we have to do something, we just use our smartphone or desktop. This is the reason wi-fi hotspots can be found everywhere.

People also use wireless in their home network to connect all devices. Every person can see the neighborhood wi-fi networks in the system, and they want to use it for free. But most these networks are secured with a password key. You need to know this security key to access the network. When your own network is down, you will desperately want to connect to these neighborhood networks. For this, people generally search for wi-fi password cracking tools to get unauthorized access to those wireless networks.

Sometimes when you are on a network, you also want to check what is happening on the network. This happens mostly in big organizations, when an employer wants to check who is doing what in the network. For these things, there are a few network hacking tools available that let users analyze packets and see what other users are doing.

In this article, I am going to discuss wireless security and best wi-fi password cracking or recovery tools. I will explain the kind of encryption wireless networks use and how these tools can crack the networks to get access. We will also see what tools let users monitor networks.

Wireless Networks and Hacking

Wireless networks are based on IEEE 802.11 standards defined by IEEE(Institute of Electrical and Electronics Engineers) for ad hoc networks or infrastructure networks. Infrastructure networks have one or more access points which coordinate the traffic between the nodes. But in ad hoc networks, there is no access point; each node connects in a peer-to-peer way.

Basically there are two types of vulnerabilities which can be found in the Wireless LAN. One is poor configuration and the other is poor encryption. Poor configuration is caused by the network admin who manages the network. It may include the weak password, no security settings, use of default configurations, and other user related things. Poor encryption is related to security keys used to protect the wireless network. It is there because of issues in WEP or WPA.

WEP and WPA

WEP and WPA are the two main security protocols used in Wi-Fi LAN. WEP is known as Wired Equivalent Privacy (WEP). It is a deprecated security protocol which was introduced back in 1997 as a part of original 802.11 standards. But it was weak, and several serious weakness were found in the protocol. Now, this can be cracked within minutes. So, a new kind of security protocol was introduced in 2003. This new protocol was Wi-Fi Protected Access (WPA). It has mainly two versions, 1 and 2 (WPA and WPA2). Now it is the current security protocol used in wireless networks. To get unauthorized access to a network, one needs to crack these security protocols. There are many tools which can crack Wi-Fi encryption. These tools can either take advantage of WEP weaknesses or use bruteforce attacks on WPA/WPA2. I am sure now you know that you should never use WEP security.

Basically wireless hacking tools are of two types. One of which can be used to sniff the network and monitor what is happening in the network. And other kinds of tools are used to hack WEP/WPA keys. These are the popular tools used for wireless password cracking and network troubleshooting.

1. Aircrack

Aircrack is one of the most popular wireless passwords cracking tools which you can use for 802.11a/b/g WEP and WPA cracking. Aircrack uses the best algorithms to recover wireless passwords by capturing packets. Once enough packets have been gathered, it tries to recover the password. To make the attack faster, it implements a standard FMS attack with some optimizations.

The company behind the tool also offers an online tutorial where you can learn how to install and use this tool to crack wireless passwords. It comes as Linux distribution, Live CD and VMware image options. You can use any of these. It supports most of the wireless adapters and is almost guaranteed to work. If you are using a Linux distribution, the only drawback of the tool is that it requires deeper knowledge of Linux. If you are not comfortable with Linux, you will find it hard to use this tool. In this case, try Live CD or VMWare image. VMWare Image needs less knowledge, but it only works with a limited set of host OS, and only USB devices are supported.

Before you start using this too, confirm that the wireless card can inject packets. Then start WEP cracking. Read the online tutorial on the website to know more about the tool. If you will follow steps properly, you will end up getting success with this tool.

Download: http://www.aircrack-ng.org/

2. AirSnort

AirSnort is another popular tool for decrypting WEP encryption on a wi-fi 802.11b network. It is a free tool and comes with Linux and Windows platforms. This tool is no longer maintained, but it is still available to download from Sourceforge. AirSnort works by passively monitoring transmissions and computing encryption keys once it has enough packets received. This tool is simple to use. If you are interested, you can try this tool to crack WEP passwords.

Download: http://sourceforge.net/projects/airsnort/

3. Cain & Able

Cain & Able is a popular password cracking tool. This tool is developed to intercept network traffic and then discover passwords by bruteforcing the password using cryptanalysis attack methods. It can also recover wireless network keys by analyzing routing protocols. It you are trying to learn wireless security and password cracking, you should once try this tool.

Download: http://www.oxid.it/cain.html

4. Kismet

Kismet is the wi-fi 802.11 a/b/g/n layer2 wireless network sniffer and IDS. It works with any wi-fi card which supports rfmon mode. It passively collects packets to identify networks and detect hidden networks. It is built on client/server modular architecture. It is available for Linux, OSX, Windows and BSD platforms.

Download: http://www.kismetwireless.net/

5. NetStumbler

NetStumbler is a popular Windows tool to find open wireless access points. This tool is free and is available for Windows. A trimmed down version of the tool is also available. It is called MiniStumbler.

Basically NetStumblet is used for wardriving, verifying network configurations, finding locations with a poor network, detecting unauthorized access points, and more.

But the tool also has a big disadvantage. It can be easily detected by most of the wireless intrusion detection systems available. This is because it actively probes a network to collect useful information. Another disadvantage of the tool is that it does not work properly with the latest 64 bit Windows OS. This is because the tool was last updated back in April 2004. It has been around 11 years since the last stable release of the tool.

Download Netstumbler: http://www.stumbler.net/

6. inSSIDer

inSSIDer is a popular Wi-Fi scanner for Microsoft Windows and OS X operating systems. Initially the tool was opensource. Later it became premium and now costs $19.99. It was also awarded as “Best Opensource Software in Networking”. The inSSIDer wi-fi scanner can do various tasks, including finding open wi-fi access points, tracking signal strength, and saving logs with GPS records.

Download inSSIDer: http://www.inssider.com/

7. WireShark

WireShark is the network protocol analyzer. It lets you check what is happening in your network. You can live capture packets and analyze them. It captures packets and lets you check data at the micro-level. It runs on Windows, Linux, OS X, Solaries, FreeBSD and others. WireShark requires good knowledge of network protocols to analyze the data obtained with the tool. If you do not have good knowledge of that, you may not find this tool interesting. So, try only if you are sure about your protocol knowledge.

Download Wireshark: https://www.wireshark.org/

8. CoWPAtty

CoWPAtty is an automated dictionary attack tool for WPA-PSK. It runs on Linux OS. This program has a command line interface and runs on a word-list that contains the password to use in the attack.

Using the tool is really simple, but it is slow. That’s because the hash uses SHA1 with a seed of SSID. It means the same password will have a different SSIM. So, you cannot simply use the rainbow table against all access points. So, the tool uses the password dictionary and generates the hack for each word contained in the dictionary by using the SSID.

The new version of the tool tried to improve the speed by using a pre-computed hash file. This pre-computed file contains around 172000 dictionary file for around 1000 most popular SSIs. But if your SSID is not in those 1000, you are unlucky.

Download CoWPAtty: http://sourceforge.net/projects/cowpatty/

9. Airjack

Airjack is a Wi-Fi 802.11 packet injection tool. This wireless cracking tool is very useful in injecting forged packets and making a network down by denial of service attack. This tool can also be used for a man in the middle attack in the network.

Download AirJack: http://sourceforge.net/projects/airjack/

10. WepAttack

WepAttack is an open source Linux tool for breaking 802.11 WEP keys. This tool performs an active dictionary attack by testing millions of words to find the working key. Only a working WLAN card is required to work with WepAttack.

Download WebAttack: http://wepattack.sourceforge.net/

11. OmniPeek

OmniPeek is another nice packet sniffer and network analyzer tool. This tool is commercial and supports only Windows operating systems. This tool is used to capture and analyze wireless traffic. But it requires you to have good knowledge of protocols to properly understand things. A good thing is that the tool works with most of the network interface cards available in market. This tool is used for network troubleshooting. This tool also supports plugins, and 40 plugins are already available to extend the features of the tool.

Download: http://www.wildpackets.com/products/distributed_network_analysis/omnipeek_network_analyzer

12. CommView for WiFi

CommView for WiFi is another popular wireless monitor and packet analyzer tool. It comes with an easy to understand GUI. It works fine with 802.11 a/b/g/n/ac networks. It captures every packet and displays useful information as a list. You can get useful information like access points, stations, signal strength, network connections and protocol distribution.

Captured packets can be decrypted by user-defined WEP or WPA keys.

This tool is basically for wi-fi network admins, security professionals, and home users who want to monitor their wi-fi traffic and programmers working on software for wireless networks.

Download CommView: http://www.tamos.com/products/commwifi/

13. CloudCracker

CloudCracker is the online password cracking tool for cracking WPA protected wi-fi networks. This tool can also be used to crack different password hashes. Just upload the handshake file, enter the network name and start the tool. This tool has a huge dictionary of around 300 million words to perform attacks.

Try Cloudcracker: https://crack.sh/

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Conclusion

In this post, I discussed 13 wireless hacking tools. A few wireless hacking tools are for cracking the password to get unauthorized access, and a few are for monitoring and troubleshooting the network. But most of the people really interested in tools to crack wireless hotspots just want to get free Internet access.

The above collection also contains those tools which try a dictionary attack to crack wi-fi passwords to allow you to get free Internet access. But be sure not to use these tools in a risky place. Hacking wireless networks to get unauthorized access may be a crime in your country. You may get into trouble for using these tools. So, please do not use these tools for illegal works. As I already mentioned, you should never use the WEP encryption key in your home or wireless network. With available tools, it is child’s play to crack the WEP keys and access your wi-fi network.

Wireless monitoring and troubleshooting tools are basically for network admins and programmers working on wi-fi based software. These tools really help when some of your systems face problems in connecting to the network.

I hope you enjoyed this article and got relevant information about popular wireless hacking and password cracking tools. I tried my best to compile this list of password hacking tools, but as a human error, I may miss something. If I forgot any important tool in this, please let me know in the comments.

Discover which company built a networked interface by MAC Address.

1. Several formats accepted: 00-1C-23-59-5A-92, 001c23595a92, 00:1C:23:59:5A:92
2. Partial searches are accepted: 001c, 2359:92
3. Uses several databases including NMAP, IEEE Official List, Wireshark Info, and more.
4. Never know what else may show up ;)

MAC address

A media access control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model.

MAC addresses are most often assigned by the manufacturer of a network interface controller (NIC) and are stored in its hardware, such as the card's read-only memory or some other firmware mechanism. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number and may be referred to as the burned-in address (BIA). It may also be known as an Ethernet hardware address (EHA), hardware address or physical address. This can be contrasted to a programmed address, where the host device issues commands to the NIC to use an arbitrary address.

A network node may have multiple NICs and each must have one unique MAC address per NIC.

MAC addresses are formed according to the rules of one of three numbering name spaces managed by the Institute of Electrical and Electronics Engineers (IEEE): MAC-48, EUI-48, and EUI-64. The IEEE claims trademarks on the names EUI-48 and EUI-64, in which EUI is an abbreviation for Extended Unique Identifier.

Notational conventions

The standard (IEEE 802) format for printing MAC-48 addresses in human-friendly form is six groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in transmission order (e.g. 01-23-45-67-89-ab or 01:23:45:67:89:ab ). This form is also commonly used for EUI-64. Another convention used by networking equipment uses three groups of four hexadecimal digits separated by dots (.) (e.g. 0123.4567.89ab ), again in transmission order.

Address details

The original IEEE 802 MAC address comes from the original Xerox Ethernet addressing scheme. This 48-bit address space contains potentially 248 or 281,474,976,710,656 possible MAC addresses.

All three numbering systems use the same format and differ only in the length of the identifier. Addresses can either be universally administered addresses or locally administered addresses. A universally administered address is uniquely assigned to a device by its manufacturer. The first three octets (in transmission order) identify the organization that issued the identifier and are known as the Organizationally Unique Identifier (OUI). The following three (MAC-48 and EUI-48) or five (EUI-64) octets are assigned by that organization in nearly any manner they please, subject to the constraint of uniqueness. The IEEE has a target lifetime of 100 years for applications using MAC-48 space, but encourages adoption of EUI-64s instead. A locally administered address is assigned to a device by a network administrator, overriding the burned-in address. Locally administered addresses do not contain OUIs.

Universally administered and locally administered addresses are distinguished by setting the second-least-significant bit of the most significant byte of the address. This bit is also referred to as the U/L bit, short for Universal/Local, which identifies how the address is administered. If the bit is 0, the address is universally administered. If it is 1, the address is locally administered. In the example address 06-00-00-00-00-00 the most significant byte is 06 (hex), the binary form of which is 00000110, where the second-least-significant bit is 1. Therefore, it is a locally administered address. Consequently, this bit is 0 in all OUIs.

If the least significant bit of the most significant octet of an address is set to 0 (zero), the frame is meant to reach only one receiving NIC. This type of transmission is called unicast. A unicast frame is transmitted to all nodes within the collision domain, which typically ends at the nearest network switch or router. A switch will forward a unicast frame through all of its ports (except for the port that originated the frame) if the switch has no knowledge of which port leads to that MAC address, or just to the proper port if it does have knowledge. Only the node with the matching hardware MAC address will accept the frame; network frames with non-matching MAC-addresses are ignored, unless the device is in promiscuous mode.

If the least significant bit of the most significant address octet is set to 1, the frame will still be sent only once; however, NICs will choose to accept it based on criteria other than the matching of a MAC address: for example, based on a configurable list of accepted multicast MAC addresses. This is called multicast addressing.

The following technologies use the MAC-48 identifier format:

• Ethernet
• 802.11 wireless networks
• IEEE 802.5 token ring
• most other IEEE 802 networks
• Fiber Distributed Data Interface (FDDI)
• Asynchronous Transfer Mode (ATM), switched virtual connections only, as part of an NSAP address
• Fibre Channel and Serial Attached SCSI (as part of a World Wide Name)
• The ITU-TG.hn standard, which provides a way to create a high-speed (up to 1 gigabit/s) local area network using existing home wiring (power lines, phone lines and coaxial cables). The G.hn Application Protocol Convergence (APC) layer accepts Ethernet frames that use the MAC-48 format and encapsulates them into G.hn Medium Access Control Service Data Units (MSDUs).

Every device that connects to an IEEE 802 network (such as Ethernet and WiFi) has a MAC-48 address. Common consumer devices to use MAC-48 include every PC, iPhone, iPad, and Android-based devices.

The distinction between EUI-48 and MAC-48 identifiers is purely nominal: MAC-48 is used for network hardware; EUI-48 is used to identify other devices and software. (Thus, by definition, an EUI-48 is not in fact a 'MAC address', although it is syntactically indistinguishable from one and assigned from the same numbering space.)

The IEEE now considers the label MAC-48 to be an obsolete term, previously used to refer to a specific type of EUI-48 identifier used to address hardware interfaces within existing 802-based networking applications, and thus not to be used in the future. Instead, the proprietary term EUI-48 should be used for this purpose.

The EUI-48 is expected to have its address space exhausted by the year 2100.

EUI-64 identifiers are used in:

• IPv6 (Modified EUI-64 as the least-significant 64 bits of a unicast network address or link-local address when stateless autoconfiguration is used)
• ZigBee / 802.15.4 / 6LoWPAN wireless personal-area networks

The IEEE has built in several special address types to allow more than one network interface card to be addressed at one time:

• Packets sent to the broadcast address, all one bits, are received by all stations on a local area network. In hexadecimal the broadcast address would be FF:FF:FF:FF:FF:FF. A broadcast frame is flooded and is forwarded to and accepted by all other nodes.
• Packets sent to a multicast address are received by all stations on a LAN that have been configured to receive packets sent to that address.
• Functional addresses identify one or more Token Ring NICs that provide a particular service, defined in IEEE 802.5.

These are all examples of group addresses, as opposed to individual addresses; the least significant bit of the first octet of a MAC address distinguishes individual addresses from group addresses. That bit is set to 0 in individual addresses and set to 1 in group addresses. Group addresses, like individual addresses, can be universally administered or locally administered.

In addition, the EUI-64 numbering system encompasses both MAC-48 and EUI-48 identifiers by a simple translation mechanism. To convert a MAC-48 into an EUI-64, copy the OUI, append the two octets FF-FF and then copy the organization-specified extension identifier. To convert an EUI-48 into an EUI-64, the same process is used, but the sequence inserted is FF-FE. In both cases, the process can be trivially reversed when necessary. Organizations issuing EUI-64s are cautioned against issuing identifiers that could be confused with these forms. The IEEE policy is to discourage new uses of 48-bit identifiers in favor of the EUI-64 system.
IPv6 — one of the most prominent standards that uses a Modified EUI-64 — treats MAC-48 as EUI-48 instead (as it is chosen from the same address pool) and toggles the U/L bit (as this makes it easier to type locally assigned IPv6 addresses based on the Modified EUI-64). This results in extending MAC addresses (such as IEEE 802 MAC address) to Modified EUI-64 using only FF-FE (and never FF-FF) and with the U/L bit inverted.

Individual address block

An Individual Address Block is a 24-bit OUI managed by the IEEE Registration Authority, followed by 12 IEEE-provided bits (identifying the organization), and 12 bits for the owner to assign to individual devices. An IAB is ideal for organizations requiring fewer than 4097 unique 48-bit numbers (EUI-48).

Mac Address Usage in hosts

Although intended to be a permanent and globally unique identification, it is possible to change the MAC address on most modern hardware. Changing MAC addresses is necessary in network virtualization. It can also be used in the process of exploiting security vulnerabilities. This is called MAC spoofing.

A host cannot determine from the MAC address of another host whether that host is on the same link (network segment) as the sending host, or on a network segment bridged to that network segment.

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In IP networks, the MAC address of an interface can be queried given the IP address using the Address Resolution Protocol (ARP) for Internet Protocol Version 4 (IPv4) or the Neighbor Discovery Protocol (NDP) for IPv6. In this way, ARP or NDP is used to translate IP addresses (OSI layer 3) into Ethernet MAC addresses (OSI layer 2). On broadcast networks, such as Ethernet, the MAC address uniquely identifies each node on that segment and allows frames to be marked for specific hosts. It thus forms the basis of most of the link layer (OSI Layer 2) networking upon which upper layer protocols rely to produce complex, functioning networks.

Mac Address Usage in switches

Layer 2 switches use MAC addresses to restrict packet transmission to the intended recipient. However, the effect is not immediate.

Bit-reversed notation

The standard notation, also called canonical format, for MAC addresses is written in transmission bit order with the least significant bit transmitted first, as seen in the output of the iproute2/ifconfig/ipconfig command, for example.

However, since IEEE 802.3 (Ethernet) and IEEE 802.4 (Token Bus) send the bytes (octets) over the wire, left-to-right, with least significant bit in each byte first, while IEEE 802.5 (Token Ring) and IEEE 802.6 send the bytes over the wire with the most significant bit first, confusion may arise when an address in the latter scenario is represented with bits reversed from the canonical representation. For example, an address in canonical form 12-34-56-78-9A-BC would be transmitted over the wire as bits 01001000 00101100 01101010 00011110 01011001 00111101 in the standard transmission order (least significant bit first). But for Token Ring networks, it would be transmitted as bits 00010010 00110100 01010110 01111000 10011010 10111100 in most-significant-bit first order. The latter might be incorrectly displayed as 48-2C-6A-1E-59-3D. This is referred to as bit-reversed order, non-canonical form, MSB format, IBM format, or Token Ring format, as explained in RFC 2469. Canonical form is generally preferred, and used by all modern implementations.

When the first switches supporting both Token Ring and Ethernet came out, some did not distinguish between canonical form and non-canonical form and so did not reverse MAC address bits as required. This led to cases of duplicate MAC addresses in the field.

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See also

• Hot Standby Router Protocol or standard alternative VRRP Virtual Router Redundancy Protocol, which allows multiple routers to share one IP address and MAC address to provide router redundancy. The OpenBSD project has an open source alternative, the Common Address Redundancy Protocol (CARP). On Linux, iptables has a CLUSTERIP target.
• NSAP address, another endpoint addressing scheme.
• Sleep Proxy Service, which may 'take over' another device's MAC address during certain periods

References

1. IEEE Std 802-2001. The Institute of Electrical and Electronics Engineers, Inc. (IEEE). 2002-02-07. p. 19. 'The universal administration of LAN MAC addresses began with the Xerox Corporation administering Block Identifiers (Block IDs) for Ethernet addresses.'
2. 'Guidelines for use of the 24-bit Organizationally Unique Identifiers (OUI)'. IEEE-SA.
3. 'Standard Group MAC Addresses: A Tutorial Guide'. IEEE-SA.
4. 'Guidelines for Fibre Channel Use of the Organizationally Unique Identifier (OUI)'. IEEE-SA.
5. 'Network Interface Controller'. Wikipedia.
6. 'Guidelines for 64-bit Global Identifier (EUI-64)'. IEEE-SA.
7. RFC 5342'IANA Considerations and IETF Protocol Usage for IEEE 802 Parameters'. IETF. September 2008.
8. IEEE-RA. 'What is an Individual Address Block?'.

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External links

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• Wireshark's OUI Lookup Tool and MAC address list