CVE-2021-39626 Explained : Impact and Mitigation
Learn about CVE-2021-39626 affecting Android devices with a vulnerability in Bluetooth settings leading to local privilege escalation without extra execution privileges.
Android devices are affected by a potential permission bypass vulnerability, leading to a local privilege escalation in Bluetooth settings without requiring additional privileges.
Understanding CVE-2021-39626
This CVE involves a confusion in permissions that could lead to privilege escalation.
What is CVE-2021-39626?
A vulnerability in ConnectedDeviceDashboardFragment.java could allow an attacker to escalate privileges locally without user interaction.
The Impact of CVE-2021-39626
The vulnerability could result in a local escalation of privilege in Bluetooth settings without the need for extra execution privileges.
Technical Details of CVE-2021-39626
The technical aspects of this vulnerability are as follows:
Vulnerability Description
The issue occurs in onAttach of ConnectedDeviceDashboardFragment.java due to a confused deputy, enabling a potential permission bypass.
Affected Systems and Versions
- Product: Android
- Affected Versions: Android-10, Android-11, Android-12, Android-9
Exploitation Mechanism
The vulnerability could be exploited locally in Bluetooth settings without the requirement of user interaction.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-39626, consider the following:
Immediate Steps to Take
- Monitor vendor updates for security patches.
- Restrict Bluetooth access to trusted devices only.
Long-Term Security Practices
- Regularly update the Android operating system.
- Implement least privilege access controls.
Patching and Updates
- Apply patches from Android security updates.