The question of how to hack Wi-Fi often arises among users who want to test the resilience of their home network to external attacks. Kali Linux is a specialized distribution designed for information security and pentesting professionals. It's important to note that unauthorized access to other people's wireless networks is illegal and punishable by law.
The use of Kali Linux tools is permitted solely for Penetration Testing of one's own networks or networks whose owners have given written consent for such work to be carried out. Ethics and legality — the first principles of any cybersecurity specialist. In this article, we'll examine the technical aspects of wireless protocols, their vulnerabilities, and how to mitigate them.
Understanding attack mechanisms is essential to building a robust defense. Most successful Wi-Fi attacks are based not on sophisticated cryptanalysis, but on the use of weak passwords and outdated hardware settings. We'll look at exactly how attackers can gain access so you can close these loopholes in your infrastructure.
Preparing equipment and interface for audit
The first step in any wireless network audit is proper hardware preparation. Standard built-in Wi-Fi modules in laptops often do not support necessary operating modes, such as Monitor Mode (monitoring mode) and Packet Injection (packet injection). Without support for these features, full-fledged traffic analysis and vulnerability testing are impossible.
For working in Kali Linux, it is recommended to use external USB adapters based on chipsets Atheros AR9271, Ralink RT3070 or Realtek RTL8812AUThese devices have proven themselves to be the most stable tools for professionals. After connecting the adapter, you need to ensure that the system is working correctly.
You can check the interface status through the terminal. Enter the command to list network devices:
ip aIn the list, find your wireless adapter, it is usually marked as wlan0 or wlan1If the device is displayed but is in the state DOWN, it must be activated. It is also important to disable processes that can intercept control of the adapter, such as NetworkManager or wpa_supplicant, as they will interfere with the interception of handshakes.
Activating monitoring mode and scanning the airwaves
Monitor mode allows the network card to capture all data packets transmitted over the air, regardless of whether they are intended for your device. This is a fundamental feature for security analysis. To put the interface into this mode in Kali Linux, use the utility airmon-ng.
Run the command to enable the mode:
sudo airmon-ng start wlan0After successful execution the interface can be renamed, for example, to wlan0monNow you can start scanning the surrounding space. Utility airodump-ng Allows you to see all available access points, their channels, encryption types and connected clients.
☑️ Scan Readiness Check
Starting a scan looks like this:
sudo airodump-ng wlan0monIn the window that opens, you'll see a list of networks. Pay attention to the columns. PWR (signal strength), Beacons (number of beacon packets) and Enc (encryption type). We are interested in networks with encryption. WPA2, as they are the de facto standard. Having a network with open encryption or legacy WEP indicates a critical configuration vulnerability.
Analysis of WPS protocol vulnerabilities
One of the most common security holes in home routers is the technology WPS (Wi-Fi Protected Setup). It was designed to simplify device connection, but the PIN implementation in this protocol contains a critical vulnerability. An attacker can brute-force an 8-digit PIN much faster than a Wi-Fi password.
To check for WPS vulnerability in Kali Linux, a tool is often used Reaver or its more modern version BullyThese utilities attempt to recover the PIN by sending special requests to the access point. If the router doesn't have brute-force protection (for example, by blocking it after several unsuccessful attempts), the password can be recovered within a few hours.
⚠️ Warning: Active use of password guessing tools creates a high network load and may result in temporary device lockup or reboot. Use only on your own equipment![1]
The verification process looks something like this:
sudo reaver -i wlan0mon -b MAC_ADDRESS_ROUTERA -vvHere -b specifies the MAC address of the target access point, and -vv Enables detailed information output. If a message about a found PIN appears in the logs, this means the network is vulnerable, and an attacker can access the router configuration or obtain the Wi-Fi password.
Why is WPS so easy to hack?
The WPS protocol splits the 8-digit PIN code into two parts. The first part is checked separately from the second. This reduces the number of possible combinations from 100 million to approximately 11,000, making it possible to brute-force them in a short time, even on low-end hardware.
WPA/WPA2 Handshake Capture and Dictionary Mining
The most common method for testing the strength of a WPA2 password is to intercept the client's authorization process, the so-called 4-way handshake (four-way handshake). When a device connects to the network, it exchanges encrypted packets containing password hashes with the router. The auditor's job is to save this exchange to a file for later analysis.
Using airodump-ng, you can filter traffic from a specific network and write it to a file:
sudo airodump-ng --bssid MAC_ROUTHER --channel CHANNEL -w capture wlan0monAfter launching the utility, you must wait for the client to connect or forcibly disconnect it from the router to force re-authorization. For this, use the tool aireplay-ng to carry out a deauthentication attack.
Command to break connection:
sudo aireplay-ng --deauth 10 -a ROUTER_MAC -c CLIENT_MAC wlan0monAs soon as in the logs airodump-ng The message "WPA Handshake" will appear. The data file can be used to crack the password. A program is used for this. hashcat or john (John the Ripper), which use dictionaries of popular passwords.
Comparison of attack methods and defensive measures
Understanding the differences between attack methods helps you choose the right defense strategy. Below is a table comparing the main attack vectors on Wi-Fi networks and their corresponding countermeasures.
| Attack method | Difficulty of implementation | Necessary condition | Effective protection |
|---|---|---|---|
| Selecting a WPS PIN | Low | WPS enabled | Disabling WPS in the router settings |
| Brute-force password | Medium/High | Weak password | Using a long, complex password (12+ characters) |
| Evil Twin | Average | User actions | Using HTTPS, checking certificates |
| Deauthentication | Low | Lack of 802.11w protection | Enabling the 802.11w protocol (PMF) |
As can be seen from the table, the most vulnerable link is often the user themselves or an incorrect basic configuration. WPA3, a new security standard, addresses many of the vulnerabilities in the handshake, making offline password guessing significantly more difficult, but its implementation is still ongoing.
FAQ: Frequently Asked Questions about Wi-Fi Security
Is it possible to hack Wi-Fi from an Android phone?
Technically, this is possible, but it requires root access and a special Wi-Fi module that supports monitoring mode, which is rare in smartphones. Most apps on the Play Market that promise "hacking" are either fake or use databases of saved passwords rather than genuine encryption hacking.
Will hiding my SSID secure my network?
No, hiding the network name (SSID) is not a security method. The network name is transmitted in cleartext in service packets and is easily read by any sniffer. This only creates the illusion of security and can make it more difficult for legitimate devices to connect.
What is the Evil Twin attack?
This method involves an attacker creating an access point with the same name (SSID) as a legitimate network, but with a stronger signal. Users' devices can automatically connect to it, after which all traffic is routed through the attacker's computer, allowing them to intercept data.
How secure is the WPA3 protocol?
WPA3 is significantly more secure than its predecessors thanks to the use of the SAE (Simultaneous Authentication of Equals) protocol, which protects against brute-force attacks even on passwords that are not particularly complex. However, like any standard, it requires proper configuration and support from client devices.