Questions about how to access someone else's network often arise out of curiosity or a desire to test the security of one's own network. However, it's important to set boundaries right away: Unauthorized access to other people's networks is a violation of the law and is prosecuted under the relevant articles. In this article, we won't teach you how to steal traffic, but rather, we'll examine the technical aspects of vulnerabilities so you can secure your own perimeter.
Understanding the mechanisms used by attackers is the best defense. If you know how an attack works, you can close the gap in your system. Wi-Fi standards are constantly evolving, but many users still use outdated settings, making their data accessible to anyone with minimal equipment.
We'll look at the testing methods available to network administrators and explain why older protocols like WEP are no longer considered secure. Modern attacks often focus not on breaking encryption, but on social engineering and the use of weak passwords. Your task is to transform your network into an impenetrable fortress by eliminating all known vulnerabilities.
Analysis of vulnerabilities of encryption protocols
The first step in understanding wireless network security is analyzing the encryption protocol used. Historically, security technologies have evolved in stages, leaving behind a trail of outdated and insecure standards. WEP (Wired Equivalent Privacy) was the first standard, but it was cracked back in the early 2000s and today represents an open door for anyone who knows how to use basic traffic analysis tools.
He was replaced by WPA (Wi-Fi Protected Access), which fixed many of its predecessor's critical flaws, but it was not perfect. A vulnerability in TKIP (Temporal Key Integrity Protocol) allowed attackers to infiltrate the data stream, albeit with certain time and traffic volume restrictions. This is why modern routers offer more advanced methods by default.
Today the gold standard is considered to be WPA2 and his successor WPA3They use the AES (Advanced Encryption Standard) algorithm, which is currently considered cryptographically secure. However, even here there are nuances: WPS (Wi-Fi Protected Setup) mode is often left enabled by default and is one of the easiest targets for brute-force PIN attacks.
⚠️ Attention: If you see a device with open access or WEP protocol in the list of available networks, do not transmit confidential data through it. This is the equivalent of shouting personal secrets in the public square.
Checking the current security status requires a careful examination of the router interface. Users often change their password but forget to update the encryption type, leaving the network vulnerable. Below is a comparison table of the main protocols to help you assess the risks:
| Protocol | Encryption algorithm | Security status | Recommendation |
|---|---|---|---|
| WEP | RC4 | Critically low | Disable immediately |
| WPA (TKIP) | RC4/TKIP | Short | Replace with WPA2 |
| WPA2 (AES) | AES-CCMP | High | Recommended standard |
| WPA3 | GCMP-256 | Maximum | Use with support |
Penetration Testing Methods (Pentest)
Information security professionals use legitimate testing methods known as Pentest, to identify weaknesses. One common method is handshake analysis. When a device connects to an access point, a key exchange occurs, which can be intercepted and decrypted offline. This requires time and computing power, especially if the password is complex.
Another method is to attack through WPSThis protocol was created to simplify connection by allowing an 8-digit PIN code to be entered instead of a long password. The problem is that a PIN code consists of only 10,000 combinations, and modern systems can brute-force them in a matter of hours or even minutes. Deauth attacks (deauthentication) are used to forcibly disconnect the client from the router to force it to resend the handshake, which is then intercepted.
How does deauthentication work?
The attacker sends a special data packet on behalf of the router to the client device (or vice versa), containing the "break connection" command. The device complies and attempts to reconnect, generating a new handshake for analysis.
It's important to understand that these tools are available not only to hackers, but also to system administrators for auditing. Using specialized software, such as Aircrack-ng or Wireshark, allows you to see the entire airwaves around you. If you're testing your network, you'll see how easily unencrypted packets or packets with weak keys are intercepted.
☑️ Network security check
Risks of using open networks and public hotspots
Public Wi-Fi networks in cafes, airports, and hotels are high-risk areas. They often have no password at all or use a simple password known to all visitors. In such an environment, any network participant can theoretically see the traffic of other users unless additional security measures are used. Man-in-the-Middle (MitM) — a classic attack where an attacker inserts himself between your device and the router.
The danger lies not only in the interception of website passwords. Vulnerabilities in operating systems or browsers can also allow malicious code to be injected. Fake access points An Evil Twin is when a hacker creates a network with a name identical to a legitimate one (e.g., "Starbucks_Free"), and users connect to it automatically, giving away their data.
To minimize risks, it is necessary to use VPN (Virtual Private Network)This tool creates an encrypted tunnel to a remote server, making your traffic unreadable to the access point owner. It's also recommended to disable automatic connections to known networks and prohibit file sharing in public areas.
⚠️ Attention: Never conduct banking transactions or enter credit card information while on an open public network without a VPN enabled.
WPS vulnerabilities and how to fix them
Technology Wi-Fi Protected Setup It was introduced to make life easier for users, allowing them to connect devices by pressing a button or entering a short code. However, the implementation of this feature turned out to be disastrously flawed. The WPS PIN is checked in stages: first the first four digits, then the next three. This reduces the number of required brute-force attempts from 100 million to approximately 11,000.
Many modern routers have protection against brute-force attacks (blocking after several unsuccessful attempts), but not all. There are methods to bypass this protection, allowing further brute-force attacks. The only reliable way to protect yourself is to completely disable the WPS function in your router settings. Even if you don't use it, it may remain active in the background.
The process for disabling is usually found in the wireless network section. Interfaces vary by manufacturer, but the logic is the same. Find the tab Wireless or Wi-Fi, then subsection WPS. Make sure the status has changed to Disable or OffAfter this, the network will become invulnerable to specific attacks on this protocol.
Social engineering and human factors
Often, the weakest defense isn't the encryption protocol, but the human element. Social engineering plays a key role in gaining access to Wi-Fi. Attackers can simply ask a careless employee for the password or use a sticky note with the password stuck to a monitor. Quizzing (Looking) over the shoulder also remains an effective method in crowded offices or coworking spaces.
Another attack vector is guest networks. If an organization provides Wi-Fi access to guests without client isolation, a connected attacker can scan other devices on the same network. Guest network must be completely isolated from the company's internal infrastructure or home local network.
Educating users and improving digital literacy is critical. Passwords shouldn't be simple strings like "12345678" or "password." Password managers generate and store complex, unique combinations for each network, making guessing impossible.
Practical steps to strengthen your router's security
To turn your router into an impenetrable fortress, you need to configure a number of settings. Start by changing the administrator password. The factory logins and passwords (often admin/admin) are known to everyone and are the first ones checked during an attack. Access the settings at 192.168.0.1 or 192.168.1.1 and change your control panel login details.
Next, set up filters. MAC filtering Allows whitelisting of only trusted devices. Although MAC addresses can be spoofed, this creates an additional barrier to attack. It is also recommended to disable Remote Management to prevent router settings from being changed from the external network.
Regular firmware updates are key to security. Manufacturers are constantly patching software vulnerabilities. If your router has stopped receiving updates, it might be time to consider upgrading to a more modern model that supports the standard. WPA3 and has up-to-date security support.
Legal aspects and liability
It's important to understand the legal implications. In most countries, including the Russian Federation, unauthorized access to computer information (Article 272 of the Russian Criminal Code) and the creation or distribution of means for unauthorized access (Article 273 of the Russian Criminal Code) are criminal offenses. Even if you were simply "joking" and connected to your neighbor's computer, it could be considered a violation of the law.
Using someone else's traffic could make you a suspect if a crime is committed or illegal content is distributed through that network. The ISP only sees the MAC address and IP address, and the access point owner will have to prove they weren't the one using it. Therefore, protecting your network also protects you from potential legal problems.
If you discover that your network is being used by outsiders, do not attempt counter-attacks. The best solution is to change your password, strengthen encryption, and, if necessary, report it to law enforcement if the damage is significant. The law is on the side of the infrastructure owner if they have taken reasonable measures to protect it.
Is it possible to crack WPA2 encryption?
Theoretically, it's possible, but in practice, it takes a tremendous amount of time and requires powerful equipment if the password is complex. It's easier to brute-force a password than to crack the encryption algorithm itself.
Is it safe to hide your network SSID?
Hiding your network name (SSID) isn't a reliable security method. Specialized programs easily detect hidden networks. This only creates inconvenience for legitimate users, but it won't stop a hacker.
What should I do if I forgot my Wi-Fi password?
If you have physical access to the router, you can reset it to factory settings using the Reset button. Afterwards, you can log in with the default password (found on the sticker) and set a new one. Alternatively, you can view the password in the network properties on an already connected computer.