CVE-2021-26199 : Exploit Details and Defense Strategies

An issue was discovered in JerryScript 2.4.0 leading to a heap-use-after-free vulnerability in the ecma_bytecode_ref function within the ecma-helpers.c file.

Understanding CVE-2021-26199

This CVE record, published on 2021-06-10, highlights a critical vulnerability affecting JerryScript version 2.4.0.

What is CVE-2021-26199?

JerryScript 2.4.0 is impacted by a heap-use-after-free vulnerability triggered in the ecma_bytecode_ref function.

The Impact of CVE-2021-26199

The heap-use-after-free vulnerability in JerryScript 2.4.0 can be exploited by attackers to execute arbitrary code or crash applications, posing a serious security risk.

Technical Details of CVE-2021-26199

The technical details of CVE-2021-26199 include:

Vulnerability Description

The vulnerability involves a heap-use-after-free issue in the ecma_bytecode_ref function within the ecma-helpers.c file.

Affected Systems and Versions

JerryScript version 2.4.0 is affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability to trigger the heap-use-after-free condition, potentially leading to arbitrary code execution or application crashes.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-26199, consider the following steps:

Immediate Steps to Take

Update JerryScript to a non-vulnerable version.
Monitor security advisories for patches or workarounds.

Long-Term Security Practices

Implement secure coding practices to prevent similar vulnerabilities.
Regularly update software to stay protected against known vulnerabilities.

Patching and Updates

Stay informed about security updates and apply patches promptly to protect systems against potential exploits.