CVE-2021-1016 Explained : Impact and Mitigation

A critical elevation of privilege vulnerability has been identified in Android-12, impacting user interaction and device security.

Understanding CVE-2021-1016

This vulnerability, identified as CVE-2021-1016, allows an attacker to grant an app access to USB without the user's informed consent, potentially leading to a local escalation of privilege.

What is CVE-2021-1016?

The vulnerability exists in the onCreate function of UsbPermissionActivity.java, making it susceptible to tapjacking/overlay attacks. This flaw requires user interaction to be exploited, with the potential for privilege escalation.

The Impact of CVE-2021-1016

If exploited, this vulnerability could allow an attacker to elevate their privileges on the device, compromising the security of the user and their data. It requires the attacker to trick the user into granting USB access without their knowledge.

Technical Details of CVE-2021-1016

This section provides specific technical details regarding the vulnerability.

Vulnerability Description

The flaw resides in the UsbPermissionActivity.java file's onCreate function, enabling unauthorized USB access by tricking users through tapjacking/overlay techniques.

Affected Systems and Versions

The vulnerability affects Android-12 systems, specifically impacting devices running this version of the Android operating system.

Exploitation Mechanism

To exploit this vulnerability, an attacker needs to lure the user into granting USB access through malicious overlays or deceptive tactics, leading to a local privilege escalation.

Mitigation and Prevention

Protecting against CVE-2021-1016 requires immediate action and long-term security practices.

Immediate Steps to Take

Users should remain cautious while granting permissions to applications, especially regarding USB access. Implementing security best practices and staying informed about potential threats is crucial.

Long-Term Security Practices

Regularly updating the device's operating system, being cautious of granting sensitive permissions, and avoiding interacting with suspicious overlays are essential for maintaining security.

Patching and Updates

Google has addressed this vulnerability in the Android-12 release. Users are advised to update their devices promptly to mitigate the risk associated with CVE-2021-1016.