CVE-2021-46170 : What You Need to Know

An issue was discovered in JerryScript commit a6ab5e9 that leads to a Use-After-Free vulnerability in js-lexer.c file.

Understanding CVE-2021-46170

This CVE involves a Use-After-Free vulnerability in JerryScript's lexer_compare_identifier_to_string function.

What is CVE-2021-46170?

JerryScript commit a6ab5e9 is affected by a Use-After-Free vulnerability in the js-lexer.c file, specifically in the lexer_compare_identifier_to_string function.

The Impact of CVE-2021-46170

The vulnerability can be exploited by an attacker to potentially execute arbitrary code, leading to a Denial of Service (DoS) condition or information disclosure.

Technical Details of CVE-2021-46170

This section provides technical details about the vulnerability.

Vulnerability Description

The issue arises from improper handling of memory in the lexer_compare_identifier_to_string function in JerryScript's js-lexer.c file.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by crafting a specially designed input that triggers the Use-After-Free condition in the lexer function.

Mitigation and Prevention

To mitigate and prevent exploitation of CVE-2021-46170, follow these recommendations:

Immediate Steps to Take

Apply the latest patches or updates from the JerryScript project.
Consider implementing input validation mechanisms to prevent malformed inputs.

Long-Term Security Practices

Conduct regular security assessments and code reviews to identify and address vulnerabilities.
Employ secure coding practices and follow best practices for memory management.

Patching and Updates

Ensure that you stay informed about security updates released by the JerryScript project and promptly apply them to your systems.