CVE-2021-0389 : Exploit Details and Defense Strategies

This article provides an in-depth analysis of CVE-2021-0389, a vulnerability in Android 11 that could lead to local privilege escalation without requiring additional execution privileges.

Understanding CVE-2021-0389

CVE-2021-0389 is a security vulnerability identified in Android 11 that lacks a crucial permission check in setNightModeActivated of UiModeManagerService.java. This oversight opens the door to potential local privilege escalation, enabling attackers to escalate their privileges without the need for user interaction.

What is CVE-2021-0389?

The CVE-2021-0389 vulnerability in Android 11 stems from a missing permission check in UiModeManagerService.java's setNightModeActivated function. Exploiting this flaw could allow threat actors to elevate their privileges locally without requiring any additional execution permissions.

The Impact of CVE-2021-0389

The impact of CVE-2021-0389 is significant as it creates a pathway for malicious actors to escalate their privileges within the Android 11 environment. By exploiting this vulnerability, attackers can gain elevated privileges without the need for user interaction, potentially leading to unauthorized access and further exploitation.

Technical Details of CVE-2021-0389

This section delves into the technical aspects of CVE-2021-0389, outlining the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in setNightModeActivated of UiModeManagerService.java in Android 11 lacks a critical permission check, paving the way for local privilege escalation. Threat actors can exploit this flaw without requiring additional execution privileges, posing a significant security risk.

Affected Systems and Versions

The impact of CVE-2021-0389 is specific to Android 11, with other versions of the Android operating system remaining unaffected. Users of Android 11 should take immediate action to mitigate the risks associated with this vulnerability.

Exploitation Mechanism

Exploiting CVE-2021-0389 involves leveraging the missing permission check in setNightModeActivated of UiModeManagerService.java. By initiating local privilege escalation through this vulnerability, attackers can gain unauthorized access and potentially compromise the Android 11 environment.

Mitigation and Prevention

In response to CVE-2021-0389, it is crucial to implement immediate security measures, followed by long-term security practices and timely patching and updates.

Immediate Steps to Take

Users of Android 11 should prioritize security measures to mitigate the risks associated with CVE-2021-0389. By taking immediate steps to address this vulnerability, individuals and organizations can enhance the security of their Android devices.

Long-Term Security Practices

Establishing robust security practices is essential for safeguarding against potential vulnerabilities like CVE-2021-0389. By adopting long-term security measures, users can fortify their systems and protect against emerging threats.

Patching and Updates

Regularly applying patches and updates is critical in addressing security vulnerabilities such as CVE-2021-0389. By staying vigilant with system updates, users can ensure their Android devices are protected against known vulnerabilities.