CVE-2021-24041 Explained : Impact and Mitigation
Learn about CVE-2021-24041 involving a missing bounds check in WhatsApp for Android, enabling out-of-bounds write attacks if a user sends a malicious image. Find mitigation steps here.
A missing bounds check in image blurring code prior to WhatsApp for Android v2.21.22.7 and WhatsApp Business for Android v2.21.22.7 could have allowed an out-of-bounds write if a user sent a malicious image.
Understanding CVE-2021-24041
This CVE details a vulnerability found in WhatsApp for Android and WhatsApp Business for Android versions less than v2.21.22.7, potentially leading to an out-of-bounds write exploit.
What is CVE-2021-24041?
CVE-2021-24041 involves a missing bounds check in the image blurring code of WhatsApp applications for Android, enabling an attacker to perform an out-of-bounds write attack by sending a malicious image.
The Impact of CVE-2021-24041
The vulnerability allows threat actors to exploit the image processing function of the affected WhatsApp versions, leading to a potential heap-based buffer overflow (CWE-122) which can result in arbitrary code execution or a denial of service.
Technical Details of CVE-2021-24041
This section covers the specific technical aspects of the CVE.
Vulnerability Description
The missing bounds check in the image blurring code of WhatsApp for Android and WhatsApp Business for Android versions less than v2.21.22.7 could permit an unauthorized write operation beyond the allocated memory space.
Affected Systems and Versions
WhatsApp for Android and WhatsApp Business for Android versions less than v2.21.22.7 are susceptible to this vulnerability.
Exploitation Mechanism
An attacker can exploit this issue by crafting a specially designed image file and sending it to a target user. Upon processing the malicious image, the out-of-bounds write operation occurs.
Mitigation and Prevention
To safeguard systems from CVE-2021-24041, consider the following security measures.
Immediate Steps to Take
Users should update their WhatsApp applications to versions equal to or higher than v2.21.22.7 to mitigate the risk of exploitation for this vulnerability.
Long-Term Security Practices
Regularly update all software applications, including messaging platforms, to the latest patched versions to defend against known vulnerabilities.
Patching and Updates
Stay informed about security advisories from WhatsApp and apply patches promptly to ensure protection against potential threats.