CVE-2021-24043 : Security Advisory and Response
Learn about CVE-2021-24043, a WhatsApp vulnerability allowing out-of-bounds heap read if a crafted RTCP packet is sent during a call. Discover impact, affected systems, and mitigation steps.
A missing bound check in RTCP flag parsing code prior to WhatsApp for Android v2.21.23.2, WhatsApp Business for Android v2.21.23.2, WhatsApp for iOS v2.21.230.6, WhatsApp Business for iOS 2.21.230.7, and WhatsApp Desktop v2.2145.0 could have allowed an out-of-bounds heap read if a user sent a malformed RTCP packet during an established call.
Understanding CVE-2021-24043
This CVE identifies a vulnerability in WhatsApp applications for Android, iOS, and Desktop versions that could lead to out-of-bounds heap reads.
What is CVE-2021-24043?
The CVE-2021-24043 vulnerability is related to a missing bound check in the RTCP flag parsing code of specific WhatsApp versions. This flaw may enable an attacker to perform an out-of-bounds heap read.
The Impact of CVE-2021-24043
If exploited, this vulnerability could allow a malicious actor to read sensitive information from the heap memory of affected WhatsApp applications, potentially compromising user data and privacy.
Technical Details of CVE-2021-24043
This section provides detailed insights into the technical aspects of the CVE.
Vulnerability Description
The vulnerability stems from inadequate boundary checks in the RTCP flag parsing code, creating a scenario where malformed packets could trigger out-of-bounds heap reads.
Affected Systems and Versions
WhatsApp for Android v2.21.23.2, WhatsApp Business for Android v2.21.23.2, WhatsApp for iOS v2.21.230.6, WhatsApp Business for iOS 2.21.230.7, and WhatsApp Desktop v2.2145.0 are impacted by this vulnerability.
Exploitation Mechanism
To exploit this vulnerability, an attacker would need to send a crafted RTCP packet while a call is in progress, triggering the out-of-bounds heap read.
Mitigation and Prevention
Protecting systems and users from potential threats is crucial. Here are some measures to mitigate the risks posed by CVE-2021-24043.
Immediate Steps to Take
Users should update their WhatsApp applications to the latest versions available, ensuring that the patched versions address the identified vulnerability.
Long-Term Security Practices
Regularly updating all software applications, including WhatsApp, and staying vigilant against suspicious activities can help prevent and detect potential security vulnerabilities.
Patching and Updates
Stay informed about security advisories and updates released by WhatsApp to promptly address any security issues and protect your devices and data from exploitation.