CVE-2021-39804 : Exploit Details and Defense Strategies

CVE-2021-39804 pertains to a potential denial of service vulnerability in Android versions 11, 12, and 12L, allowing for remote exploitation without the need for extra privileges. User interaction is required for an attack.

Understanding CVE-2021-39804

This section delves into the specifics of CVE-2021-39804.

What is CVE-2021-39804?

CVE-2021-39804 involves a susceptibility in the reinit of HeifDecoderImpl.cpp, where a missing null check could result in a remote persistent denial of service in the Android file picker, with no additional execution privileges required.

The Impact of CVE-2021-39804

The vulnerability could potentially lead to a persistent denial of service attack with remote exploitation capabilities.

Technical Details of CVE-2021-39804

This section explores the technical aspects of CVE-2021-39804.

Vulnerability Description

The vulnerability in HeifDecoderImpl.cpp could cause a crash due to a missing null check, potentially enabling a denial of service attack.

Affected Systems and Versions

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

Exploitation Mechanism

The vulnerability could be exploited remotely, leading to a persistent denial of service in the Android file picker, requiring user interaction.

Mitigation and Prevention

Understanding how to mitigate and prevent CVE-2021-39804 is crucial.

Immediate Steps to Take

Apply relevant patches provided by the vendor.
Regularly update Android devices to the latest versions.

Long-Term Security Practices

Conduct regular security assessments and audits.
Implement security best practices and coding standards.

Patching and Updates

Stay informed about security bulletins from Android.
Implement timely patching and updates to mitigate vulnerabilities.