The popular dash cam system, BlackVue DR750-2CH LTE, running firmware version 1.012_2022.10.26, has been found to contain a weak default 'SSID_Passphrase' value for its WPA2 protected Wi-Fi communication feature. This vulnerability, tagged as CVE-2023-27746, exposes the device to a potential brute force attack, allowing an attacker to intercept the WPA2 handshake and crack the passphrase to gain unauthorized access to the Wi-Fi network. Exploiting this critical security flaw, hackers can compromise the device’s integrity and access sensitive information, including video files, real-time monitoring, and device configurations.
Original References
The details of this vulnerability can be found in the official CVE database here and the National Vulnerability Database (NVD) here. It is essential to read the applicable references thoroughly to understand the full implications and potential mitigation strategies at your disposal.
Exploit Details
BlackVue Wi-Fi uses a default SSID_Passphrase format like 'Blackvue####', where the four-digit numbers (####) are unique to each device. However, this format’s security is low and makes it a prime candidate for a brute force attack.
To perform a brute force attack against the BlackVue Wi-Fi network, an attacker would intercept the WPA2 handshake between the BlackVue device and the legitimate connecting device (phone, laptop, etc.).
One of the most popular tools to perform this attack is Aircrack-ng. Upon capturing the handshake file (.cap or .hccapx), it can be loaded into the tool, and a custom wordlist or dictionary list containing possible passphrase guesses can be presented. The tool will then attempt to match the entries to an intercepted handshake to reveal the correct passphrase:
Code Snippet
# First, capture the WPA2 handshake
airmon-ng start <interface>
airodump-ng -c <channel> --bssid <BSSID> -w <output_file> <interface>
# After handshake capture, use a custom wordlist to brute force the passphrase
aircrack-ng -w <wordlist> <handshake.cap>
Since the SSID_Passphrase is weak and easily guessable, the brute force attack can efficiently reveal the correct passphrase and grant unauthorized access to the Wi-Fi network.
Upon successful access, an attacker can potentially manipulate video data, view live footage, modify device configurations, or perform any other action that a legitimate user can perform on the BlackVue Wi-Fi network.
To mitigate this vulnerability, users should take the following recommended steps
1. Update the firmware of the BlackVue dashcam device if an updated version is available, thereby rectifying the issue, if applicable.
2. Change the default SSID_Passphrase to a strong, unique passphrase. Make sure to use a combination of upper and lowercase letters, numbers, and special characters.
Conclusion
As connected devices continue to expand across homes, vehicles, and workplaces, ensuring robust security measures becomes increasingly important. Vulnerabilities like CVE-2023-27746 in the BlackVue DR750-2CH LTE v.1.012_2022.10.26 firmware highlight the need for device manufacturers and users to prioritize and continuously evaluate cybersecurity. Make sure to keep track of vulnerabilities, apply necessary updates, and modify default configurations to protect your devices and the valuable information they hold.
Timeline
Published on: 04/13/2023 20:15:00 UTC
Last modified on: 04/21/2023 19:06:00 UTC