CVE-2021-0319 : Exploit Details and Defense Strategies
Learn about CVE-2021-0319 affecting Android versions 8.0 to 11. Understand the impact, technical details, and mitigation steps for this Bluetooth MAC address vulnerability.
A security vulnerability, identified as CVE-2021-0319, affects various versions of Android. This vulnerability could potentially allow an attacker to obtain a nearby Bluetooth device's MAC address without appropriate permissions, leading to a local privilege escalation issue. User interaction is required for exploitation.
Understanding CVE-2021-0319
This section delves into the details of the CVE-2021-0319 vulnerability.
What is CVE-2021-0319?
The vulnerability exists in checkCallerIsSystemOr function of CompanionDeviceManagerService.java in Android OS. It provides a means to acquire a nearby Bluetooth device's MAC address without the necessary permissions, potentially resulting in a local escalation of privilege.
The Impact of CVE-2021-0319
The exploitation of this vulnerability could allow an attacker to gain access to nearby Bluetooth device MAC addresses, which may lead to a significant security risk with potential local privilege escalation.
Technical Details of CVE-2021-0319
In this section, we explore the technical aspects of the CVE-2021-0319 vulnerability.
Vulnerability Description
The vulnerability arises from a permissions bypass in the CompanionDeviceManagerService.java component, enabling unauthorized access to nearby Bluetooth device MAC addresses on affected Android versions.
Affected Systems and Versions
Android versions 8.0, 8.1, 9, 10, and 11 are impacted by CVE-2021-0319 due to the permissions bypass issue in CompanionDeviceManagerService.java.
Exploitation Mechanism
To exploit this vulnerability, an attacker requires user interaction to trick the user into granting permissions for accessing Bluetooth device MAC addresses.
Mitigation and Prevention
This section provides insights into mitigating the risks associated with CVE-2021-0319.
Immediate Steps to Take
Users are advised to apply security patches provided by Android to address the vulnerability and prevent potential exploitation by malicious actors.
Long-Term Security Practices
Implementing robust security measures, such as restricting unnecessary permissions and staying updated with security bulletins, can help enhance the overall security posture.
Patching and Updates
Regularly updating the Android OS to the latest available version ensures that critical security patches are applied to safeguard the system against known vulnerabilities.