CVE-2021-1040 : What You Need to Know

Android devices are vulnerable to a local escalation of privilege (EoP) attack through a tapjacking/overlay vulnerability in BluetoothPairingSelectionFragment.java's onCreate method. This vulnerability, identified as A-182810085, affects Android versions 9, 10, 11, and 12, requiring user interaction for exploitation.

Understanding CVE-2021-1040

This CVE highlights a critical EoP vulnerability in Android devices through a tapjacking attack, potentially allowing malicious actors to escalate privileges locally.

What is CVE-2021-1040?

CVE-2021-1040 refers to a vulnerability present in the onCreate function of BluetoothPairingSelectionFragment.java in Android devices. The flaw could enable attackers to exploit a tapjacking/overlay technique to achieve local privilege escalation.

The Impact of CVE-2021-1040

The impact of this vulnerability is concerning as it could lead to unauthorized users gaining elevated privileges on affected Android devices. Successful exploitation may result in various malicious activities without requiring additional execution privileges.

Technical Details of CVE-2021-1040

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

Vulnerability Description

The vulnerability resides in the onCreate method of BluetoothPairingSelectionFragment.java, facilitating the tapjacking/overlay attack for local escalation of privilege on Android devices.

Affected Systems and Versions

Android versions 9, 10, 11, and 12 are affected by CVE-2021-1040, leaving a broad range of devices susceptible to potential exploitation.

Exploitation Mechanism

The exploit requires user interaction, wherein a malicious actor could leverage tapjacking/overlay techniques in the Bluetooth pairing selection fragment to achieve privilege escalation.

Mitigation and Prevention

To address CVE-2021-1040 and enhance the security posture of Android devices, it is crucial to implement immediate steps, adopt long-term security practices, and prioritize patching and updates.

Immediate Steps to Take

Users are advised to exercise caution while interacting with Bluetooth pairing prompts and avoid suspicious activities that may trigger a tapjacking attack.

Long-Term Security Practices

Maintaining device hygiene, ensuring regular security updates, and staying vigilant against social engineering tactics can significantly enhance the overall security of Android devices.

Patching and Updates

Regularly applying security patches and software updates provided by Android can help mitigate the risks associated with CVE-2021-1040 and other potential vulnerabilities.