CVE-2021-33462 : Vulnerability Insights and Analysis

An issue was discovered in yasm version 1.3.0 that leads to a use-after-free vulnerability in expr_traverse_nodes_post() in libyasm/expr.c.

Understanding CVE-2021-33462

This CVE involves a specific version of the yasm tool and poses a risk due to a use-after-free flaw.

What is CVE-2021-33462?

CVE-2021-33462 refers to a use-after-free vulnerability in yasm version 1.3.0, specifically in the expr_traverse_nodes_post() function within libyasm/expr.c.

The Impact of CVE-2021-33462

Exploitation of this vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by crashing the application.

Technical Details of CVE-2021-33462

This section covers the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises due to improper handling of memory during expression traversal in the affected function.

Affected Systems and Versions

Yasm version 1.3.0 is affected by this vulnerability, potentially impacting systems using this specific version.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a special input to trigger the use-after-free condition and gain control over the affected application.

Mitigation and Prevention

It is crucial to take immediate steps and establish long-term security measures to mitigate the risks associated with CVE-2021-33462.

Immediate Steps to Take

Users should update to a patched version of yasm or apply relevant security fixes provided by the vendor to address this vulnerability.

Long-Term Security Practices

Implementing secure coding practices and conducting regular security assessments can help prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security updates for yasm and promptly apply patches to ensure protection against known vulnerabilities.