CVE-2020-1896 Explained : Impact and Mitigation

Facebook Hermes stack overflow vulnerability allows remote attackers to execute arbitrary code via crafted JavaScript.

Understanding CVE-2020-1896

A stack overflow vulnerability in Facebook Hermes 'builtin apply' allows potential remote code execution.

What is CVE-2020-1896?

Vulnerability in Facebook Hermes 'builtin apply' prior to commit 86543ac47e59c522976b5632b8bf9a2a4583c7d2
Attackers can execute arbitrary code through crafted JavaScript
Exploitable if the application permits evaluation of untrusted JavaScript

The Impact of CVE-2020-1896

Allows attackers to potentially execute arbitrary code
Most React Native applications are not affected unless permitting evaluation of untrusted JavaScript

Technical Details of CVE-2020-1896

Facebook Hermes stack overflow vulnerability technical details.

Vulnerability Description

CWE-121: Stack-based Buffer Overflow

Affected Systems and Versions

Product: Hermes
Vendor: Facebook
Versions: Commit prior to 86543ac47e59c522976b5632b8bf9a2a4583c7d2

Exploitation Mechanism

Attackers exploit the vulnerability by crafting malicious JavaScript

Mitigation and Prevention

Protect your system from Facebook Hermes stack overflow vulnerability.

Immediate Steps to Take

Upgrade Hermes to the version beyond commit 86543ac47e59c522976b5632b8bf9a2a4583c7d2
Avoid evaluation of untrusted JavaScript unless necessary

Long-Term Security Practices

Regularly update and patch software components
Implement secure coding practices and restrict evaluation of untrusted JavaScript

Patching and Updates

Refer to Facebook security advisories and Hermes commits for patch updates