CVE-2021-24026 Explained : Impact and Mitigation

A missing bounds check within the audio decoding pipeline in WhatsApp applications for Android and iOS could lead to an out-of-bounds write vulnerability.

Understanding CVE-2021-24026

This CVE identifies a security issue in WhatsApp for Android and iOS versions.

What is CVE-2021-24026?

CVE-2021-24026 highlights a missing bounds check within the audio decoding pipeline for WhatsApp calls in WhatsApp for Android versions prior to v2.21.3, WhatsApp Business for Android versions prior to v2.21.3, WhatsApp for iOS versions prior to v2.21.32, and WhatsApp Business for iOS versions prior to v2.21.32, which could potentially allow an attacker to perform an out-of-bounds write.

The Impact of CVE-2021-24026

This vulnerability could be exploited by malicious actors to execute arbitrary code or cause a denial of service (DoS) condition, posing a significant threat to user data and device integrity.

Technical Details of CVE-2021-24026

The vulnerability details include:

Vulnerability Description

A missing bounds check in the audio decoding pipeline of WhatsApp calls.

Affected Systems and Versions

WhatsApp Business for iOS (prior to v2.21.32)
WhatsApp for iOS (prior to v2.21.32)
WhatsApp Business for Android (prior to v2.21.3)
WhatsApp for Android (prior to v2.21.3)

Exploitation Mechanism

By exploiting the missing bounds check, attackers could craft malicious audio data to trigger an out-of-bounds write, leading to potential code execution.

Mitigation and Prevention

To address CVE-2021-24026, follow these steps:

Immediate Steps to Take

Ensure users update their WhatsApp applications to the latest versions to mitigate the vulnerability. Review device settings and permissions to enhance security.

Long-Term Security Practices

Regularly update all applications and the underlying operating system to patch known vulnerabilities. Educate users about safe practices while using messaging apps.

Patching and Updates

Stay informed about security advisories from WhatsApp and promptly apply any security patches or updates released by the vendor.