CVE-2021-39701 Explained : Impact and Mitigation

Android serviceConnection in ControlsProviderLifecycleManager.kt can lead to local privilege escalation without the need for additional privileges.

Understanding CVE-2021-39701

A vulnerability in Android's serviceConnection can potentially escalate privileges locally without requiring extra execution rights.

What is CVE-2021-39701?

Product: Android
Versions affected: Android-11, Android-12
Type: Elevation of privilege
Android ID: A-212286849
Identified by: Google Android
Published: 2022-03-16

The Impact of CVE-2021-39701

The vulnerability allows for local escalation of privilege without the need for additional execution privileges, requiring user interaction for exploitation.

Technical Details of CVE-2021-39701

The technical specifics behind CVE-2021-39701 and its implications.

Vulnerability Description

In ControlsProviderLifecycleManager.kt's serviceConnection, improper input validation enables the service to run in the foreground without notification or permission, leading to privilege escalation.

Affected Systems and Versions

The vulnerability affects:

Android-11
Android-12

Exploitation Mechanism

The flaw can be exploited by keeping the service running in the foreground without the necessary notification or permission, allowing for local escalation of privilege.

Mitigation and Prevention

Steps to address and prevent CVE-2021-39701.

Immediate Steps to Take

Monitor official Android security bulletins for updates
Apply relevant patches promptly

Long-Term Security Practices

Regularly update Android devices
Follow best practices for secure coding and input validation

Patching and Updates

Stay informed about security patches from official sources
Implement patches as soon as they are released