CVE-2021-24029 : Exploit Details and Defense Strategies

A detailed overview of CVE-2021-24029 focusing on a packet of death scenario in mvfst and proxygen by Facebook.

Understanding CVE-2021-24029

This CVE describes a vulnerability in mvfst and proxygen software developed by Facebook.

What is CVE-2021-24029?

CVE-2021-24029 involves a packet of death scenario in mvfst where a specially crafted message during a QUIC session can cause a crash via a failed assertion. It affects versions prior to commit a67083ff4b8dcbb7ee2839da6338032030d712b0 in mvfst and versions prior to v2021.03.15.00 in proxygen.

The Impact of CVE-2021-24029

The vulnerability could potentially lead to denial of service (DoS) attacks by causing the software to crash under certain conditions, resulting in service disruption for users.

Technical Details of CVE-2021-24029

In-depth technical insights into the CVE-2021-24029 vulnerability.

Vulnerability Description

A packet of death scenario is possible in mvfst via a specially crafted message during a QUIC session, leading to a crash via a failed assertion.

Affected Systems and Versions

The issue affects mvfst versions prior to commit a67083ff4b8dcbb7ee2839da6338032030d712b0 and proxygen versions prior to v2021.03.15.00.

Exploitation Mechanism

The vulnerability can be exploited by sending a specially crafted message during a QUIC session, triggering a failed assertion and leading to a crash.

Mitigation and Prevention

Important steps to mitigate and prevent exploitation of CVE-2021-24029.

Immediate Steps to Take

Update mvfst to commit a67083ff4b8dcbb7ee2839da6338032030d712b0 or newer versions.
Update proxygen to v2021.03.15.00 or later to prevent exploitation.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Facebook regarding mvfst and proxygen.

Patching and Updates

Apply patches and updates released by Facebook promptly to address security vulnerabilities and protect systems.