CVE-2017-8851 Explained : Impact and Mitigation

A flaw in OnePlus One and X devices affects the OTA update process, allowing attackers to install updates meant for one device onto the other, potentially leading to unpatched vulnerabilities exploitation.

Understanding CVE-2017-8851

This CVE involves a vulnerability in the OTA update process of OnePlus One and X devices, enabling attackers to manipulate the update mechanism.

What is CVE-2017-8851?

The vulnerability arises from a lenient updater-script and shared OTA verification keys between the devices, allowing unauthorized installation of updates across devices.

The Impact of CVE-2017-8851

Attackers can exploit this flaw to install updates from one device to another, increasing the attack surface and potentially exposing unpatched vulnerabilities.
The affected device may become unusable until a Factory Reset is performed.
Man-in-the-Middle attackers can target the update process due to the lack of TLS encryption.
Physical attackers can utilize 'adb sideload' to push OTA updates by rebooting the device into recovery mode.

Technical Details of CVE-2017-8851

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows unauthorized installation of OTA updates across OnePlus One and X devices due to shared OTA verification keys and a lenient updater-script.

Affected Systems and Versions

Products: OnePlus One and X
Versions: Not applicable

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating the OTA update process, installing updates across devices.

Mitigation and Prevention

Protecting systems from CVE-2017-8851 requires immediate actions and long-term security practices.

Immediate Steps to Take

Regularly check for OTA updates from trusted sources.
Implement secure update mechanisms with proper encryption.
Perform Factory Reset if the device shows signs of compromise.

Long-Term Security Practices

Ensure devices have the latest security patches installed.
Monitor for unauthorized update activities on devices.
Educate users on the risks of unsecured update processes.

Patching and Updates

Apply official patches and updates provided by the device manufacturer.