CVE-2021-39691 Explained : Impact and Mitigation

Android has a vulnerability in the WindowManager that could lead to a tapjacking attack, resulting in privilege escalation. This CVE affects Android versions 10, 11, and 12.

Understanding CVE-2021-39691

This CVE involves a security issue in Android's WindowManager that can be exploited through user interaction.

What is CVE-2021-39691?

CVE-2021-39691 is a vulnerability in Android that allows for a tapjacking attack in the WindowManager component, potentially leading to local privilege escalation without the need for additional execution privileges.

The Impact of CVE-2021-39691

The vulnerability could be exploited by malicious actors to escalate privileges locally on affected Android devices running versions 10, 11, and 12.

Technical Details of CVE-2021-39691

The technical specifics of this CVE are as follows:

Vulnerability Description

In the WindowManager of Android, an incorrect window flag processing user input can enable a tapjacking attack, which, when combined with user interaction, could result in privilege escalation.

Affected Systems and Versions

Product: Android
Versions Affected: Android-10, Android-11, Android-12

Exploitation Mechanism

The vulnerability can be exploited through user interaction, possibly tricking users into granting unintended permissions or accessing sensitive information.

Mitigation and Prevention

To address CVE-2021-39691, the following steps can be taken:

Immediate Steps to Take

Update Android devices to the latest available security patches provided by the device manufacturer.
Be cautious of granting unnecessary permissions to apps that request them.

Long-Term Security Practices

Regularly check for security updates and apply them promptly.
Use reputable app sources and avoid installing applications from unknown or untrusted sources.

Patching and Updates

It is crucial to regularly update Android devices to the latest security patches provided by Google or the device manufacturer to mitigate the risk of exploitation.