CVE-2021-0333 : Security Advisory and Response

Android's BluetoothPermissionActivity.java is vulnerable to a permissions bypass issue, enabling an elevation of privilege attack. By displaying a tapjacking overlay during Bluetooth device connection, the phonebook permissions dialog can be obscured, potentially allowing a local user to gain escalated privileges with user execution capabilities.

Understanding CVE-2021-0333

This CVE highlights a critical security flaw in Android's BluetoothPermissionActivity.java, impacting versions 8.1 to 11.

What is CVE-2021-0333?

The CVE-2021-0333 vulnerability involves a tapjacking overlay interfering with the phonebook permissions dialog during Bluetooth device connection, potentially leading to a local privilege escalation requiring user interaction for exploitation.

The Impact of CVE-2021-0333

The exploitation of this vulnerability could allow a local attacker to gain elevated privileges, posing a risk of unauthorized access to sensitive data or system resources on affected Android devices.

Technical Details of CVE-2021-0333

Android's BluetoothPermissionActivity.java vulnerability in versions 8.1 to 11 allows a permissions bypass and elevation of privilege.

Vulnerability Description

The flaw arises from a tapjacking overlay that obscures the phonebook permissions dialog during Bluetooth device connection, enabling the bypass of critical security protocols.

Affected Systems and Versions

Android versions 8.1, 9, 10, and 11 are impacted by this vulnerability due to the insecure handling of permission dialogs in BluetoothPermissionActivity.java.

Exploitation Mechanism

An attacker can exploit this vulnerability by displaying a tapjacking overlay during the connection of a Bluetooth device, tricking the user into granting unnecessary permissions.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-0333, users and administrators must take immediate action to secure their Android devices.

Immediate Steps to Take

Users should exercise caution when connecting Bluetooth devices, paying close attention to permission requests. Ensure devices are updated with the latest security patches from the official Android Security Bulletin.

Long-Term Security Practices

Implement security best practices such as keeping devices up to date, avoiding unknown Bluetooth connections, and being vigilant about permission requests to prevent potential attacks.

Patching and Updates

Google may release security patches addressing CVE-2021-0333. Users should regularly check for and apply these updates to protect their devices against known vulnerabilities.