CVE-2021-24027 : Vulnerability Insights and Analysis

A cache configuration issue prior to WhatsApp for Android v2.21.4.18 and WhatsApp Business for Android v2.21.4.18 may have allowed a third party with access to the device’s external storage to read cached TLS material.

Understanding CVE-2021-24027

This CVE describes a cache configuration issue in WhatsApp for Android and WhatsApp Business for Android that could potentially compromise the security of cached TLS material.

What is CVE-2021-24027?

CVE-2021-24027 is a vulnerability in WhatsApp for Android versions prior to v2.21.4.18 and WhatsApp Business for Android versions prior to v2.21.4.18. It allows an unauthorized third party with access to the device's external storage to read cached TLS material, posing a security risk.

The Impact of CVE-2021-24027

This vulnerability could lead to unauthorized access to sensitive information stored in the device's cache, including encrypted communications and session data. Attackers exploiting this vulnerability could intercept sensitive data transmitted through WhatsApp.

Technical Details of CVE-2021-24027

The technical details of CVE-2021-24027 include:

Vulnerability Description

The cache configuration issue in WhatsApp for Android and WhatsApp Business for Android versions prior to v2.21.4.18 allows unauthorized access to cached TLS material stored in the device's external storage.

Affected Systems and Versions

Product: WhatsApp Business for Android

Vendor: Facebook
Affected Version: v2.21.4.18

Product: WhatsApp for Android

Vendor: Facebook
Affected Version: Prior to v2.21.4.18
Version Type: Custom

Exploitation Mechanism

An attacker needs access to the device's external storage to exploit this vulnerability. By reading the cached TLS material, they could potentially decrypt and access sensitive information.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-24027, consider the following:

Immediate Steps to Take

Update WhatsApp for Android and WhatsApp Business for Android to version v2.21.4.18 or later.
Avoid storing sensitive information in the cache.
Regularly monitor and review access to the device's external storage.

Long-Term Security Practices

Implement encryption mechanisms for sensitive data stored on the device.
Educate users about the risks of unauthorized access to cached data.

Patching and Updates

Stay informed about security advisories from WhatsApp and apply patches promptly to address known vulnerabilities.