CVE-2021-33459 : Exploit Details and Defense Strategies

An issue was discovered in yasm version 1.3.0, involving a NULL pointer dereference in nasm_parser_directive() in modules/parsers/nasm/nasm-parse.c.

Understanding CVE-2021-33459

This CVE pertains to a vulnerability in yasm version 1.3.0 that can lead to a NULL pointer dereference in a specific module.

What is CVE-2021-33459?

CVE-2021-33459 is a vulnerability identified in yasm version 1.3.0, specifically in the nasm_parser_directive() function within nasm-parse.c file.

The Impact of CVE-2021-33459

Exploitation of this vulnerability can result in a NULL pointer dereference, potentially leading to a denial of service (DoS) condition or arbitrary code execution.

Technical Details of CVE-2021-33459

This section covers the specifics of the vulnerability, including affected systems, versions, and how the exploit occurs.

Vulnerability Description

The vulnerability involves a NULL pointer dereference in the nasm_parser_directive() function of yasm version 1.3.0, found in the modules/parsers/nasm/nasm-parse.c file.

Affected Systems and Versions

The issue affects yasm version 1.3.0.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a special request to trigger the NULL pointer dereference, potentially leading to a crash or execution of malicious code.

Mitigation and Prevention

To address CVE-2021-33459, it is crucial to take immediate steps and implement long-term security practices.

Immediate Steps to Take

Users are advised to apply patches or updates provided by the vendor to mitigate the vulnerability.

Long-Term Security Practices

Maintain a proactive approach to security by keeping software up to date, conducting regular security assessments, and implementing security best practices.

Patching and Updates

Regularly check for updates or patches released by yasm to address the vulnerability and ensure the security of the system.