CVE-2021-24044 : Exploit Details and Defense Strategies

A detailed analysis of CVE-2021-24044 focusing on the impact, technical details, and mitigation strategies.

Understanding CVE-2021-24044

This section provides insights into the nature and implications of the CVE-2021-24044 vulnerability.

What is CVE-2021-24044?

The vulnerability involves passing invalid JavaScript code to Hermes, which triggers generator functions incorrectly, leading to segmentation faults and potential remote code execution (RCE) in versions prior to v0.10.0.

The Impact of CVE-2021-24044

CVE-2021-24044 poses a significant risk due to type confusion errors, potentially enabling attackers to exploit the vulnerability for RCE with a low probability.

Technical Details of CVE-2021-24044

In this section, we delve deeper into the specific technical aspects of the CVE-2021-24044 vulnerability.

Vulnerability Description

The vulnerability arises from invoking generator functions erroneously in Hermes when await and yield are used in non-async and non-generator getter/setter functions, resulting in type confusion and potential RCE.

Affected Systems and Versions

Hermes versions before v0.10.0 are impacted by CVE-2021-24044, making them susceptible to the exploitation of type confusion leading to potential RCE.

Exploitation Mechanism

Exploiting the CVE-2021-24044 vulnerability involves crafting and injecting malicious JavaScript code that triggers the flawed generator function invocation in affected Hermes versions.

Mitigation and Prevention

In this section, we outline essential steps to mitigate the risks associated with CVE-2021-24044 and prevent potential exploitation.

Immediate Steps to Take

Update Hermes to version v0.10.0 or higher to mitigate the vulnerability and prevent potential exploitation.

Long-Term Security Practices

Employ secure coding practices to prevent injection of malicious JavaScript code that could trigger the vulnerable behavior in Hermes.

Patching and Updates

Stay vigilant for security advisories and updates from Facebook to address vulnerabilities like CVE-2021-24044 effectively.