CVE-2020-0473 : Security Advisory and Response

Android Bluetooth Permissions Bypass Vulnerability

Understanding CVE-2020-0473

What is CVE-2020-0473?

In the BluetoothOppNotification.java updateIncomingFileConfirmNotification function in Android 11, a permissions bypass vulnerability exists. This flaw could be exploited by a local attacker with physical possession of the device to transfer files over Bluetooth without requiring additional execution privileges.

The Impact of CVE-2020-0473

This vulnerability could lead to an elevation of privilege, allowing an attacker to perform unauthorized file transfers to the device without the need for user interaction.

Technical Details of CVE-2020-0473

Vulnerability Description

The vulnerability exists in the updateIncomingFileConfirmNotification function of BluetoothOppNotification.java in Android 11, enabling a permissions bypass.

Affected Systems and Versions

Product: Android
Versions Affected: Android-11

Exploitation Mechanism

The attacker must have physical access to the device to exploit the vulnerability and can transfer files over Bluetooth without requiring additional execution privileges.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest security patches provided by Google for Android.
Avoid connecting to untrusted or unknown Bluetooth devices.
Monitor and restrict Bluetooth connectivity on sensitive devices.

Long-Term Security Practices

Implement proper physical security measures to prevent unauthorized access to devices.
Regularly update and patch all software to address known vulnerabilities.
Educate users on the risks associated with Bluetooth connections and file transfers.
Consider using additional security controls such as device encryption.

Patching and Updates

It is crucial to apply security updates released by Android to ensure that known vulnerabilities, including this Bluetooth permissions bypass issue, are resolved.