CVE-2021-0328 : Security Advisory and Response

A vulnerability labeled as CVE-2021-0328 has been identified in Android devices, specifically affecting versions Android-10, Android-11, Android-8.1, and Android-9. The vulnerability allows for a local elevation of privilege due to a missing permission check in certain functions of GattService.java.

Understanding CVE-2021-0328

This section will delve into the details of the CVE-2021-0328 vulnerability to provide a comprehensive understanding of its implications.

What is CVE-2021-0328?

The vulnerability exists in the onBatchScanReports and deliverBatchScan functions of GattService.java, enabling unauthorized retrieval of Bluetooth scan results without the necessary permissions. This could potentially lead to a local escalation of privilege without requiring additional execution privileges or user interaction for exploitation.

The Impact of CVE-2021-0328

The impact of CVE-2021-0328 is significant as it allows malicious actors to exploit the Bluetooth functionality on affected Android devices without proper authorization, potentially leading to a local privilege escalation.

Technical Details of CVE-2021-0328

In this section, the technical aspects of CVE-2021-0328 will be elaborated to provide insight into how the vulnerability operates.

Vulnerability Description

The vulnerability arises from a missing permission check in the GattService.java file, specifically in the onBatchScanReports and deliverBatchScan methods, enabling unauthorized access to Bluetooth scan results.

Affected Systems and Versions

Android devices running versions Android-10, Android-11, Android-8.1, and Android-9 are susceptible to CVE-2021-0328 due to the identified vulnerability in GattService.java.

Exploitation Mechanism

Exploiting CVE-2021-0328 involves leveraging the oversight in permission validation within GattService.java to retrieve Bluetooth scan results without the necessary authorization, leading to a local escalation of privilege.

Mitigation and Prevention

To address CVE-2021-0328 and enhance the security posture of affected devices, certain mitigation strategies and preventive measures can be implemented.

Immediate Steps to Take

Users are advised to install security updates provided by Android as soon as they are released to patch the vulnerability and protect their devices from potential exploitation.

Long-Term Security Practices

Implementing robust security practices such as regularly updating devices, exercising caution while downloading apps, and being vigilant against suspicious activities can help prevent security incidents.

Patching and Updates

Staying informed about security bulletins and patches released by Android, particularly those addressing CVE-2021-0328, is crucial to ensure devices are protected against known vulnerabilities.