CVE-2021-0438 : Security Advisory and Response

Android versions 8.1, 9, and 10 are affected by a tapjacking vulnerability in InputDispatcher.cpp and WindowManagerService.java, potentially leading to local privilege escalation without additional permissions. User interaction is required for exploitation.

Understanding CVE-2021-0438

This CVE (Common Vulnerabilities and Exposures) identifier points to a tapjacking flaw in Android versions 8.1, 9, and 10, which could be exploited for local privilege escalation.

What is CVE-2021-0438?

The CVE-2021-0438 vulnerability exists in several functions of InputDispatcher.cpp, WindowManagerService.java, and related files in Android versions 8.1, 9, and 10. It is classified as an elevation of privilege issue.

The Impact of CVE-2021-0438

Exploitation of this vulnerability could allow an attacker to locally escalate privileges without the need for additional permissions, posing a security risk to affected Android devices.

Technical Details of CVE-2021-0438

Here are the specific technical details related to CVE-2021-0438:

Vulnerability Description

The vulnerability stems from an incorrect FLAG_OBSCURED value in certain functions, opening the door to tapjacking attacks that could facilitate local privilege escalation.

Affected Systems and Versions

Android versions 8.1, 9, and 10 are impacted by this vulnerability, requiring attention and mitigation measures to secure devices running these OS versions.

Exploitation Mechanism

To exploit CVE-2021-0438, an attacker would need to interact with the user to manipulate the incorrect FLAG_OBSCURED value and achieve privilege escalation.

Mitigation and Prevention

Safeguarding against CVE-2021-0438 requires immediate actions and long-term security practices:

Immediate Steps to Take

Users and administrators should apply security updates promptly, utilize security software, and exercise caution while granting permissions or interacting with unfamiliar interfaces.

Long-Term Security Practices

Implementing defense-in-depth strategies, maintaining up-to-date software versions, regularly assessing security posture, and educating users about potential threats are essential for long-term security.

Patching and Updates

Vendor-provided patches and updates should be promptly applied to mitigate CVE-2021-0438 and enhance the overall security posture of affected Android devices.