In today's digital world, wireless technology has become an integral part of the infrastructure of any home or office. However, the convenience of Wi-Fi often conflicts with security requirements, making networks vulnerable to external attacks. Many users are unaware that their data can be intercepted and their router accessed by an intruder.
To assess the security of their own network and understand how encryption protocols work, information security specialists use specialized tools. One of the most powerful and accessible solutions is a terminal emulator. Termux based on the operating system AndroidIt turns an ordinary smartphone into a portable penetration testing station, allowing you to run complex network utilities.
It is important to understand that any scanning, packet sniffing, or attempts to penetrate other people's networks without the owner's written permission is illegal. Ethical hacking This knowledge is used exclusively to protect one's own assets or as part of authorized penetration testing. In this article, we'll examine the theoretical aspects of audit tools and methods that will help you strengthen your perimeter defenses.
Preparing the environment and basic requirements
Before exploring audit tools, it's important to properly prepare the software environment. Android's default capabilities limit app access to the network interface, so full functionality requires root access or the use of special drivers that support monitor mode. Without this, most commands will return errors or operate in a limited mode.
The first step is to install the terminal emulator itself from trusted sources such as F-Droid or the official repository GitHubGoogle Play versions are often outdated and don't support necessary features. After installing the app, you need to update packages and install basic utilities, such as pkg upgrade And pkg install root-repo, which will provide access to an expanded set of tools.
⚠️ Warning: Exploiting vulnerabilities in other people's networks is punishable by law. All methods described below are intended solely for testing the security of your own devices and networks with the owner's written permission.
Working with network interfaces often requires installing additional drivers, especially if you plan to connect an external USB Wi-Fi adapter via an OTG cable. Built-in smartphone modules rarely support switching to monitor mode, which is necessary for intercepting handshakes. Therefore, professionals often use external chipset-based cards. Atheros or Ralink.
☑️ Preparing Termux for work
Installing and configuring the required packages
Ecosystem Termux allows you to install hundreds of packages similar to those used in Linux distributions such as Kali Linux or Parrot OSTo get started with network auditing, you need to install a basic set of tools. Commands are entered sequentially in the terminal, and each one downloads the necessary binaries and libraries.
The main tool for working with wireless interfaces is the package hcxdumptool, which replaced outdated utilities like aircrack-ng on mobile platforms. It allows you to capture handshakes and perform vulnerability analysis of WPA2 protocols. To install it, use the command pkg install hcxdumptool, which will automatically pull in dependencies.
Also extremely useful is the package nmap, designed to scan ports and identify services running on devices on the network. It helps map the network and identify open entry points. Installation is performed with the command pkg install nmap. No less important python, since many modern audit scripts are written in this language.
Why do you need monitor mode?
Monitor Mode allows the network card to capture all packets passing through the air, even those not addressed to your device. Without this mode, only passive analysis is possible, but data interception or network penetration is impossible.
After installing the basic set of tools, it's recommended to test their functionality. Enter the program name without arguments to view help. If the system responds with a list of commands, then command line interface The correct functionality is in place. Otherwise, you may need to recheck access rights or reinstall packages.
|Cloning repositories with tools
| Plastic bag | Purpose | Installation command |
|---|---|---|
| hcxdumptool | Capturing Handshakes and WPA2 Analysis | pkg install hcxdumptool |
| nmap | Port and host scanning | pkg install nmap |
| python | Running audit scripts | pkg install python |
| git | pkg install git |
Wireless space analysis and scanning
The first step of any audit is reconnaissance. You need to get a complete picture of what's happening in the airwaves around you. Tools in Termux allow you to not only see a list of available networks, but also receive detailed information about each node, including encryption type, channel, and signal strength.
To start working with an interface, you often need to put it into monitor mode. This is done using commands specific to your driver or through interface management utilities. For example, the command ip link set wlan0 down disables the interface, and iw dev wlan0 set type monitor changes its operating mode. After this, the interface is turned back on with the command ip link set wlan0 up.
Usage hcxdumptool Enables passive scanning, collecting data on clients and access points. The running process outputs a real-time data stream, showing device MAC addresses and request types. This helps identify active devices and potential targets for further vulnerability analysis.
An important aspect is the ability to filter the received information. In urban environments, the airwaves are oversaturated with signals, making it difficult to find the desired network. Using filters by BSSID (the MAC address of the access point) or ESSID (the network name) allows you to focus on a specific object of study and ignore extraneous noise.
Diagnosing vulnerabilities in encryption protocols
Understanding the weaknesses of encryption protocols is key to building strong security. Protocol WPA2, which remains the de facto standard, has known vulnerabilities related to the 4-way handshake process. This is where the key exchange occurs, and if the password is weak, it can be recovered offline.
There is also a vulnerability Krack (Key Reinstallation Attack), which affects protocol implementation in many devices. Although patches have already been released, many routers and IoT devices remain unprotected. Auditing tools allow you to check whether a specific access point is vulnerable to attacks by analyzing the device's responses to specific requests.
⚠️ Warning: The WEP protocol is considered completely cracked and should not be used under any circumstances. Its presence on your network renders it completely unsafe.
A dictionary attack is used to test password strength. After capturing a handshake, it is saved to a file, which is then attacked. The speed of the attack depends on the processor power and the password complexity. GPU acceleration On external devices, this can significantly reduce verification time, but on mobile devices, this process can take hours or even days.
Modern networks using WPA3, are significantly better protected thanks to the SAE (Simultaneous Authentication of Equals) protocol, which prevents brute-force attacks in real time. However, they are not without potential risks associated with configuration and implementation by equipment manufacturers.
Network traffic monitoring and packet analysis
Once access to the data stream is gained (for legitimate purposes, such as debugging one's own equipment), the analysis phase begins. Packet sniffing allows one to see what data is being transmitted in cleartext. This could include unencrypted HTTP requests, DNS queries, or application metadata.
The following format is often used to analyze captured packets: PCAPFiles saved in Termux, can be exported and opened in a graphical analyzer Wireshark on a PC for deeper analysis. This allows you to visualize data flows and identify anomalies that are difficult to spot in the terminal's text format.
Particular attention should be paid to unencrypted protocols such as Telnet, FTP or HTTPSharing passwords and logins through these channels is like sending a postcard that anyone can read. Analysis tools help identify such leaks and take steps to migrate to secure alternatives.SSH, SFTP, HTTPS).
When monitoring, it's important to not only look at the content but also analyze the statistics. Sharp spikes in traffic, unusual destination ports, or intermittent connections to suspicious IP addresses may indicate the presence of malware or a botnet on your network.
Steps to protect your home Wi-Fi network
Understanding attack methods is the best way to build an effective defense. If you know how easy it is to intercept a handshake, the first step to protection is using a complex password. The password's length and use of a variety of characters make brute-force attacks mathematically impossible within a reasonable timeframe.
Disabling the function WPS Wi-Fi Protected Setup (Wi-Fi Protected Setup) is a mandatory feature for any modern router. This feature, designed to simplify connection, has critical vulnerabilities that allow the PIN code to be recovered in a matter of hours or even minutes. Find this option in the router settings and disable it.
Regular router firmware updates patch security holes discovered by manufacturers. Many users ignore this step, leaving their devices vulnerable to known exploits. Automatic updates are the best option, but you need to check for them manually in the admin interface.
Network segmentation also plays an important role. The guest network should be isolated from the main network, where your personal files and smart home are located. If a guest device is infected, the virus will not be able to spread to the main computers thanks to client isolation.
FAQ: Frequently Asked Questions about Network Auditing
Is it possible to hack a neighbor's Wi-Fi using Termux without root access?
Without root access, functionality is significantly limited. Most tools require direct access to the network interface to switch to monitor mode, which is prohibited by standard Android tools without elevated access rights. Furthermore, built-in smartphone modules often don't support the necessary commands.
What is the best Wi-Fi adapter for Termux?
Adapters based on chipsets are considered the most compatible. Atheros AR9271, Ralink RT3070 And Realtek RTL8812AUThey have open-source drivers and fully support monitor mode and packet injection in Linux and Android environments.
Is it dangerous to use Termux to explore networks?
The tool itself is safe. The danger lies in its misuse. Scanning and attempting to connect to other people's networks without permission violates the laws of most countries. Use this information only to protect your data and for educational purposes on your own equipment.
Why doesn't hcxdumptool detect my Wi-Fi adapter?
This could be due to several reasons: the adapter doesn't support monitor mode, there are no drivers, you don't have root access, or the adapter is busy with another process. Check the list of connected USB devices with the command lsusb and make sure the interface is displayed in ip link.