CVE-2020-1914 : Exploit Details and Defense Strategies

A logic vulnerability in Facebook Hermes prior to commit b2021df620824 allows attackers to potentially execute arbitrary code via crafted JavaScript.

Understanding CVE-2020-1914

A logic vulnerability in Facebook Hermes prior to commit b2021df620824 allows attackers to potentially execute arbitrary code.

What is CVE-2020-1914?

This CVE involves a logic vulnerability in Facebook Hermes that could be exploited by attackers to execute arbitrary code.

The Impact of CVE-2020-1914

Attackers could potentially read out of bounds or execute arbitrary code via crafted JavaScript.
Most React Native applications are not affected unless they permit the evaluation of untrusted JavaScript.

Technical Details of CVE-2020-1914

Facebook Hermes prior to commit b2021df620824 is affected by this vulnerability.

Vulnerability Description

A logic vulnerability in handling the SaveGeneratorLong instruction enables attackers to execute arbitrary code through crafted JavaScript.

Affected Systems and Versions

Product: Hermes
Vendor: Facebook
Versions affected: Prior to commit b2021df620824

Exploitation Mechanism

Attackers exploit the SaveGeneratorLong instruction to execute arbitrary code via crafted JavaScript.

Mitigation and Prevention

Taking immediate action and implementing long-term security practices are crucial.

Immediate Steps to Take

Update Hermes to a version post commit b2021df620824 to mitigate the vulnerability.
Avoid evaluating untrusted JavaScript in applications.

Long-Term Security Practices

Conduct regular security assessments and audits to identify vulnerabilities.
Educate developers on secure coding practices and review code for potential vulnerabilities.
Implement strict input validation to prevent code execution through malicious scripts.

Patching and Updates

Regularly monitor for security updates from Facebook Hermes and apply patches promptly to secure the system.