CVE-2021-43453 : Security Advisory and Response

A Heap-based Buffer Overflow vulnerability exists in JerryScript 2.4.0 and prior versions via an out-of-bounds read in parser_parse_for_statement_start in the js-parser-statm.c file.

Understanding CVE-2021-43453

This vulnerability poses a risk due to a heap-based buffer overflow issue in JerryScript versions 2.4.0 and earlier.

What is CVE-2021-43453?

The vulnerability in JerryScript 2.4.0 and prior versions arises from an out-of-bounds read in parser_parse_for_statement_start in the js-parser-statm.c file.

The Impact of CVE-2021-43453

The identified Heap-based Buffer Overflow vulnerability could potentially be exploited by attackers to execute arbitrary code or cause a denial of service.

Technical Details of CVE-2021-43453

The technical aspects of the vulnerability in JerryScript 2.4.0 and earlier versions.

Vulnerability Description

Type: Heap-based Buffer Overflow
Location: parser_parse_for_statement_start in js-parser-statm.c

Affected Systems and Versions

Systems running JerryScript 2.4.0 and prior versions

Exploitation Mechanism

Attackers can trigger the vulnerability by performing an out-of-bounds read in the specific file.

Mitigation and Prevention

Actions to address and prevent the CVE-2021-43453 vulnerability.

Immediate Steps to Take

Update JerryScript to a version that includes a patch for the vulnerability
Monitor system logs for any suspicious activities

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflows
Regular security assessments and code reviews

Patching and Updates

Regularly check for security updates and patches for the library