CVE-2021-26198 : Security Advisory and Response

This article provides details about CVE-2021-26198, an issue discovered in JerryScript 2.4.0 involving a SEVG in the ecma_deref_bigint function.

Understanding CVE-2021-26198

This section covers the impact, technical details, and mitigation strategies for CVE-2021-26198.

What is CVE-2021-26198?

CVE-2021-26198 is a vulnerability identified in JerryScript 2.4.0, specifically in the ecma_deref_bigint function within the ecma-helpers.c file.

The Impact of CVE-2021-26198

The vulnerability could potentially allow an attacker to execute arbitrary code or disrupt the normal functioning of the affected system.

Technical Details of CVE-2021-26198

Below are the specific technical aspects of CVE-2021-26198 that users should be aware of:

Vulnerability Description

The issue arises from a SEVG in the ecma_deref_bigint function of JerryScript 2.4.0, creating a potential security risk.

Affected Systems and Versions

JerryScript 2.4.0 is confirmed to be affected by this vulnerability.

Exploitation Mechanism

Attackers may exploit this vulnerability by leveraging the SEVG in the ecma_deref_bigint function to execute malicious code.

Mitigation and Prevention

To safeguard systems from CVE-2021-26198, consider the following steps:

Immediate Steps to Take

Update JerryScript to a non-vulnerable version.
Implement security controls to limit unauthorized access to the affected systems.

Long-Term Security Practices

Regularly monitor for security advisories and updates from JerryScript.
Conduct thorough security assessments to identify and address vulnerabilities proactively.

Patching and Updates

Ensure timely application of patches and updates released by JerryScript to address CVE-2021-26198 and other potential security threats.