CVE-2020-1912 : Vulnerability Insights and Analysis

Facebook Hermes prior to commit 091835377369c8fd5917d9b87acffa721ad2a168 is vulnerable to an out-of-bounds read/write issue in certain scenarios, potentially leading to arbitrary code execution.

Understanding CVE-2020-1912

An in-depth look at the vulnerability in Facebook Hermes and its potential impacts.

What is CVE-2020-1912?

An out-of-bounds read/write flaw in lazily compiled inner generator functions of Facebook Hermes.
Attackers could exploit this to execute malicious code through crafted JavaScript, affecting applications allowing untrusted JavaScript evaluation.

The Impact of CVE-2020-1912

Allows attackers to execute arbitrary code on vulnerable systems.
Most React Native applications are not affected under default configurations.

Technical Details of CVE-2020-1912

Insights into the technical aspects of the vulnerability.

Vulnerability Description

Out-of-bounds read/write issue in Facebook Hermes.

Affected Systems and Versions

Product: Hermes
Vendor: Facebook
Versions: Commit prior to 091835377369c8fd5917d9b87acffa721ad2a168

Exploitation Mechanism

Crafted JavaScript is used to exploit lazily compiled inner generator functions, enabling arbitrary code execution.

Mitigation and Prevention

Measures to address and prevent the vulnerability.

Immediate Steps to Take

Update to a version beyond commit 091835377369c8fd5917d9b87acffa721ad2a168.
Restrict evaluation of untrusted JavaScript in applications.

Long-Term Security Practices

Regularly review and update security configurations.
Follow best practices for securing JavaScript evaluation.

Patching and Updates

Apply patches provided by Facebook to fix the vulnerability.