Disclaimer

This post is for educational and informational purposes only. The methods described here are intended to raise awareness about potential security risks associated with RFID WiFi tags. Misuse of this information to gain unauthorized access to networks or systems is illegal and unethical. Always ensure that you have proper authorization before testing or attempting to exploit any system. The author assumes no responsibility for any actions taken by individuals using the information provided in this post for unlawful purposes.

Remember, ethical hacking is about helping organizations and individuals improve their security, not exploiting vulnerabilities for malicious gain.

WiFi networks are essential in our connected world, and companies are constantly finding ways to make access to them more convenient. One such method is using RFID tags to allow seamless connection to WiFi networks. However, this convenience comes with risks. In this post, we’ll walk through how an RFID WiFi tag can be copied using a Flipper Zero and how this can open up potential vulnerabilities. Additionally, we will discuss best practices to secure such networks and mitigate the risks.

What Is an RFID WiFi Tag?

An RFID (Radio-Frequency Identification) tag is a small device that stores data, which can be read wirelessly using a compatible reader. Some organizations use RFID tags to store WiFi credentials, allowing authorized users to scan the tag and instantly connect to the network without manually entering the password.

This can be convenient in environments like hotels, offices, or visitor centers. However, without the proper security controls, this can also open doors for malicious actors.

Reproducing the Process: Copying an RFID WiFi Tag with a Flipper Zero

The Flipper Zero is a versatile hacking tool that can read, emulate, and interact with RFID devices. Let’s walk through how an attacker could use this device to copy and emulate an RFID WiFi tag and gain unauthorized access to a network.

1. Reading the RFID Tag with the Flipper Zero

First, let’s assume you have access to a location where an RFID WiFi tag is used. The Flipper Zero can easily read most RFID tags, especially those operating at lower frequencies (125 kHz or 13.56 MHz). Here are the steps to read the tag:

• Power on the Flipper Zero.
• Navigate to the RFID section.
• Select Read.
• Place the RFID tag next to the Flipper Zero.
• The device will capture the RFID data and display the stored information.

2. Copying the RFID Tag

Once the Flipper Zero reads the RFID tag, it can store that data for future use. You can save the data directly on the Flipper:

• After reading, choose the Save option on the Flipper to store the RFID tag’s data.
• Name the file appropriately for easy reference.

3. Emulating the RFID Tag

Now, with the RFID data saved, the Flipper can emulate the tag. This means that it will mimic the original RFID tag when scanned by the reader. Here’s how to emulate the tag:

• Navigate to the Saved RFID section on the Flipper.
• Select the previously saved RFID tag.
• Choose the Emulate option.
• The Flipper will now act as if it’s the original RFID tag.

4. Logging Into the WiFi Network

With the RFID tag emulated, you can use it in the same way the original user would:

• Bring the Flipper to the RFID reader.
• The reader will detect it as the original tag and grant access to the network.
• Congratulations, you’ve successfully gained access to the WiFi network!

Analyzing the Risks

The scenario described above is a major security risk, especially in environments where RFID WiFi tags are used to provide access to the main network without proper segmentation. Some of the key risks include:

1. Unauthorized Network Access

If an attacker copies an RFID WiFi tag, they can gain unauthorized access to the network, potentially allowing them to:

• Monitor traffic.
• Intercept sensitive data such as passwords, emails, and internal communications.
• Spread malware or ransomware across the network.

2. Vulnerability Exploitation

Once on the network, attackers can exploit vulnerabilities in connected devices or services, such as:

• Unpatched software with known vulnerabilities.
• Poorly secured IoT devices.
• Misconfigured network settings.

3. Data Theft

With access to the network, attackers can access shared drives, databases, or other resources that contain sensitive information, leading to data theft or a breach of confidentiality.

Risk Mitigation and Best Practices

To protect against the risks associated with RFID WiFi tags and unauthorized network access, there are several mitigation strategies and best practices that organizations can implement:

1. Network Segmentation

Segment your network into different zones based on access levels:

• Visitor Networks: Ensure that visitors and guests only have access to a separate network that is isolated from sensitive resources. This way, even if someone gains unauthorized access to the RFID-based WiFi, they cannot interact with the main network.
• Internal Networks: Critical systems and sensitive data should be placed on a protected, internal network that is not directly accessible from the visitor network.

2. Multi-Factor Authentication (MFA)

Use MFA for network access. Even if someone emulates an RFID tag, they will still need an additional factor, such as a one-time password (OTP) or biometric authentication, to log in.

3. Encryption and Secure Communication

Ensure that all data transmitted over the WiFi network is encrypted. Use protocols like WPA3 for WiFi security, and require VPNs for accessing internal systems remotely.

4. Monitor for Unusual Activity

Set up network monitoring to detect unusual activity, such as:

• Multiple failed login attempts.
• Connections from unknown devices.
• Large data transfers or unexpected behavior on the network.

By monitoring these indicators, you can identify and respond to suspicious behavior before it leads to a serious security incident.

5. Limit Physical Access to RFID Tags

Keep RFID WiFi tags in secure areas that are not accessible to the general public. Only authorized personnel should have access to the tags to minimize the risk of them being copied.

6. Regularly Update Firmware and Security Patches

Ensure that all networking equipment, RFID readers, and connected devices are up to date with the latest security patches. Unpatched vulnerabilities are a common target for attackers once they gain access to a network.

Final Thoughts

RFID WiFi tags offer convenience, but as we’ve shown, they can also pose significant security risks if not managed properly. By copying and emulating a tag with a device like the Flipper Zero, an attacker can gain unauthorized access to a network, potentially leading to data breaches or further exploitation.

However, with proper network segmentation, multi-factor authentication, and network monitoring, you can mitigate these risks and ensure that your network remains secure. Remember, convenience should never come at the cost of security.

Your network security is only as strong as its weakest link. Make sure RFID tags aren’t the weak point in your system.