CVE-2021-39803 : Security Advisory and Response

Android devices with specific versions are affected by a vulnerability that could lead to remote information disclosure.

Understanding CVE-2021-39803

This CVE identifies a potential out-of-bounds read vulnerability in Android devices.

What is CVE-2021-39803?

In ~Impl of C2AllocatorIon.cpp, a use after free issue exists, allowing for a possible out-of-bounds read. Exploiting this vulnerability could result in remote information disclosure without the need for additional privileges.

The Impact of CVE-2021-39803

The vulnerability may lead to remote information disclosure, requiring user interaction for exploitation.

Technical Details of CVE-2021-39803

Android devices running specific versions are affected by this vulnerability.

Vulnerability Description

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

Affected Systems and Versions

The vulnerability impacts Android devices with the following versions:

Android-10
Android-11
Android-12
Android-12L

Exploitation Mechanism

The vulnerability arises due to a use after free issue in ~Impl of C2AllocatorIon.cpp, enabling an out-of-bounds read.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2021-39803:

Immediate Steps to Take

Apply necessary security patches provided by Android.
Exercise caution when interacting with unknown or untrusted sources.
Update Android devices to the latest available firmware.

Long-Term Security Practices

Regularly update Android devices to ensure protection against known vulnerabilities.
Implement security best practices recommended by Android.

Patching and Updates

Ensure devices are updated with the latest Android security patches to mitigate the risk posed by this vulnerability.