Questions about how to access someone else's network often arise from a desire to test one's own security or recover a forgotten password. However, it's important to clarify: Kali Linux β This is a professional penetration testing distribution, not a toy for novice hackers. Any scanning or attack on networks you don't own or for which you don't have the owner's written permission is illegal and subject to prosecution.
Instead of looking for ways to "hack" a network, it's better to study the principles of security protocols and audit methods. Understanding vulnerabilities allows administrators and advanced users to build impenetrable defensive perimeters. In this article, we'll explore the technical aspects of wireless interfaces, traffic monitoring tools, and the ways attackers might attempt to breach your privacy, so you can effectively counter them.
The use of specialized software requires strict adherence to ethical standards. Kali Linux provides a powerful arsenal that, if handled improperly, can cause damage not only to someone else's infrastructure, but also to your own equipment. Accessing computer information without the owner's consent is a criminal offense in many jurisdictions. Therefore, all further material is considered solely for educational purposes for setting up the protection of your own perimeters.
Preparing the environment and checking equipment
The first step in a security audit is properly preparing the work environment. Standard built-in Wi-Fi adapters in laptops often have limited functionality and don't support the required operating modes. For full-fledged testing, you'll need an external USB adapter with monitor mode and packet injection support. Without these two features, conducting in-depth wireless traffic analysis is technically impossible.
When choosing equipment, it is worth paying attention to the chipsets from manufacturers Atheros, Ralink or RealtekMany modern maps are based on MediaTek They also show excellent results, but require proper driver configuration. Before running any utilities, ensure that your adapter is correctly detected by the system and switches to the correct operating mode.
- π‘ Monitor mode allows the card to capture all packets in the air, ignoring addressing to a specific MAC address.
- π Packet injection allows you to send specially crafted frames to test the access point's response.
- πΎ Drivers must be compatible with the Linux kernel and support the library mac80211.
To check the capabilities of your adapter, use the command in the terminal iw listIn the output, you need to look for the line βSupported interface modesβ, which must contain the item monitorSupport for the 2.4 GHz and 5 GHz frequency ranges is also important, as modern networks are increasingly migrating to higher frequencies, where there is less interference and higher data transfer rates.
β οΈ Note: When switching the adapter to monitor mode, your current internet connection will be disconnected. This is normal behavior, as the card no longer associates with the access point and begins passively listening to the air.
Kali Linux Wireless Audit Toolkit
Ecosystem Kali Linux includes hundreds of pre-installed utilities, each of which solves specific problems. For a novice auditor, it's important to avoid confusion in this diversity and identify the key tools necessary for basic analysis. The core package around which most processes are built is aircrack-ng.
This set of utilities consists of several components: airmon-ng to control interface modes, airodump-ng to collect information about networks and aireplay-ng for traffic generation. In addition, handshakes are often analyzed hashcat or john, although they require significant computing resources. For working with the WPS protocol, an indispensable tool remains Reaver or its more modern version Bully.
It's important to understand the difference between passive and active scanning. Passive data collection leaves no traces in the access point's logs, whereas active attacks, such as deauthentication, are immediately visible to the network administrator. Below is a table of the main utilities and their purposes.
| Utility | Main function | Type of impact |
|---|---|---|
| airmon-ng | Managing interface modes | Local (on the adapter) |
| airodump-ng | Sniffing and packet analysis | Passive |
| aireplay-ng | Traffic injection and deauthentication | Active |
| wifite | Automated network attacks | Active/Automatic |
Using graphical interfaces such as Wifite2This may simplify the task for beginners, but it hides important details of the process. For a deeper understanding of what's happening, it's recommended to study the output of console utilities, which show every step of interaction with the target network. This allows for better error diagnosis and understanding why the attack might have failed.
Analysis of encryption protocols and vulnerabilities
Wireless network security is directly dependent on the encryption protocol used. Historically, the standard has long been WEP, which is currently considered completely compromised. It takes just minutes to crack, regardless of password complexity, as the vulnerability lies in the RC4 encryption algorithm itself.
Came to replace WPA/WPA2-Personal, which uses more secure algorithms, is not without its flaws. The main weakness lies in the 4-Way Handshake. If an attacker manages to intercept this process and has a sufficiently powerful dictionary for brute-force attacks, access can be gained. The protocol WPA3, which appeared later, eliminates many of the holes of its predecessors by implementing protection against offline password guessing.
- π WEP: An obsolete standard that can be cracked automatically and is not recommended for use.
- π‘οΈ WPA2-PSK: Current standard, vulnerable to dictionary attacks with weak passwords.
- π WPA3: Implements SAE (Simultaneous Authentication of Equals), protecting against handshake interception.
The technology deserves special attention WPS (Wi-Fi Protected Setup), designed to simplify device connection. The implementation of this standard in many routers contains a critical vulnerability: the PIN code consists of only eight digits, with the last digit serving as a checksum. This reduces the number of possible combinations from 100 million to approximately 11,000, making an attack trivial even for weaker equipment.
Why is WPS so dangerous?
The WPS protocol splits the 8-digit PIN code into two parts. The first part (4 digits) is verified separately from the second (3 digits + a check digit). This allows each part to be attacked independently, dramatically reducing brute-force time.
Network administrators should immediately disable WPS in their router settings if the firmware supports it. Even if you use a complex WPA2 password, having WPS enabled negates all protection. You can check for this vulnerability using a utility. reaver or wash, included in the distribution.
Network Security Testing Methodology
The network audit process must follow a clear algorithm to minimize risks and obtain reliable results. First, reconnaissance is conducted: all active devices and access points within range must be identified. At this stage, passive scanning is used, which does not disrupt network operation but provides a complete picture of the airwaves.
After selecting the target network (your own), the data collection phase begins. To analyze the strength of a WPA2 password, you must wait for a legitimate client to connect or force it to reconnect. This is accomplished using a deauth attack, which temporarily disconnects the client from the router, forcing it to re-authenticate.
aireplay-ng --deauth 10 -a [router_MAC] -c [client_MAC] wlan0monIn this command the parameter --deauth 10 Specifies the number of connection termination packets sent. The goal is to intercept EAPOL frames containing password hashes. The resulting handshake file is then saved for later offline analysis. It's important to understand that interception alone does not provide access to the network; it only provides data for password strength testing.
β οΈ Warning: Sending deauthentication packets is an active intervention in network operation. At production facilities or in areas with critical infrastructure, such actions may cause equipment failure.
Scripts can be used to automate the process of collecting handshakes and checking them for weaknesses, but manual monitoring is preferable. It allows you to see real network activity and understand which devices are connected. If unfamiliar MAC addresses appear in the client list, this indicates that an intruder may have penetrated the network.
Protecting your home and business network
Understanding attack methods is the best way to build an effective defense. The first and most important step is to abandon default passwords and use long, complex character combinations. A 15+ character passphrase containing mixed-case letters, numbers, and special characters makes a brute-force attack virtually impossible for the foreseeable future.
Additionally, it's essential to regularly update your router firmware. Manufacturers often patch security holes discovered by researchers. Ignoring updates leaves your network open to exploits that take advantage of known vulnerabilities in your router's software.
βοΈ Wi-Fi Security Checklist
It's also recommended to segment your network. Create a separate guest SSID for visitors and IoT devices (smart light bulbs, refrigerators), which often have weak built-in security. This isolates the main network containing personal data from potentially vulnerable devices that could become entry points for an attacker.
Maximum protection is achieved by using a corporate standard WPA2-Enterprise (802.1x). In this case, each user must enter their own unique login and password to connect, and authentication occurs through a separate server (RADIUS). This completely eliminates the possibility of using shared dictionaries to hack the access point, as there is simply no static password.
Legal aspects and ethics of hacking
Owning security audit tools carries with it responsibility. Legislation in most countries strictly regulates activities in the information space. Using Kali Linux and similar distributions is not a crime in itself, but using these tools to access someone else's data without the owner's permission falls under criminal law.
Even if your goal is "just to check," the fact of penetrating someone else's network is already a violation. If the network owner notices suspicious activity and contacts law enforcement, your adapter's IP address and MAC address may be used as evidence. Digital traces persist in ISP and router logs for quite a long time.
- βοΈ Unauthorized access to computer information is prohibited by law.
- π« Using sniffers on other people's networks without written permission is illegal.
- π For a legal pentest, a signed agreement with the infrastructure owner is required.
Professional information security specialists always work within the agreed-upon terms of reference (Rules of Engagement). These documents clearly define the testing boundaries, timeframes, and methods that can be used. Even a single violation of these boundaries can lead to serious legal consequences.
Thus, Kali Linux is a powerful scalpel in the hands of a surgeon, but a dangerous weapon in the hands of an amateur. Learn the technology, protect your data, improve your skills, but always remain within the law. Security is a process, not a result, and it requires constant attention and updating of knowledge.
Is it possible to hack Wi-Fi from a phone using Kali NetHunter?
Technically, this is possible, but it requires specific equipment. Most smartphones don't have built-in Wi-Fi modules that support monitor and injection modes. This requires root access, installing Kali NetHunter, and connecting an external USB Wi-Fi adapter via an OTG cable. Without an external adapter, functionality will be extremely limited.
How long does it take to crack a Wi-Fi password?
The time depends on the password complexity and the hardware power. For WEP, it's seconds. For WPA2 with a simple dictionary password, it's anywhere from a few minutes to hours. If the password is long (12+ characters) and contains a random string of characters, it can take years or even centuries for modern GPU clusters to crack it, making the attack impractical.
Will hiding your SSID protect you from being hacked?
No, hiding the network name (SSID broadcast) is not a security measure. The network name is easily detected in management frames, even if it is not broadcast openly. This only creates the illusion of security and can cause connection issues for legitimate devices, which will constantly search for the hidden network, revealing its location.
What should I do if I forgot my network password?
The most reliable way is to look up the password in the connected computer's settings (in the wireless adapter properties) or on the sticker on the bottom of the router (if the password hasn't been changed). If this isn't possible, reset the router to factory settings using the Reset button and reconfigure the network with a new, known password.