CVE-2021-33465 : What You Need to Know

An issue was discovered in yasm version 1.3.0 that leads to a NULL pointer dereference in expand_mmacro() in modules/preprocs/nasm/nasm-pp.c.

Understanding CVE-2021-33465

This CVE refers to a specific vulnerability found in yasm version 1.3.0 that can result in a NULL pointer dereference when using expand_mmacro() in modules/preprocs/nasm/nasm-pp.c.

What is CVE-2021-33465?

It is a vulnerability in yasm version 1.3.0 that occurs due to improper handling of a NULL pointer, potentially leading to a crash or denial of service.

The Impact of CVE-2021-33465

Exploitation of this vulnerability could allow attackers to cause a denial of service condition or potentially execute arbitrary code on the target system.

Technical Details of CVE-2021-33465

This section provides a deeper dive into the technical aspects of the CVE.

Vulnerability Description

The vulnerability involves a NULL pointer dereference in the expand_mmacro() function in the specified path within the source code of yasm version 1.3.0.

Affected Systems and Versions

The issue affects yasm version 1.3.0 specifically, but other versions may also be impacted. Users of yasm should take immediate action to address this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious input that triggers the NULL pointer dereference, potentially leading to a crash or other security compromise.

Mitigation and Prevention

To safeguard systems from CVE-2021-33465, the following measures should be implemented.

Immediate Steps to Take

Update to a patched version of yasm that addresses the NULL pointer dereference vulnerability.
Monitor for any unusual system behavior or crashes that could indicate exploitation.

Long-Term Security Practices

Regularly update software to receive the latest security patches and fixes.
Implement secure coding practices to prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security advisories related to yasm and promptly apply relevant patches and updates.