CVE-2021-33467 : Vulnerability Insights and Analysis

An issue was discovered in yasm version 1.3.0 that leads to a use-after-free vulnerability in pp_getline() in modules/preprocs/nasm/nasm-pp.c.

Understanding CVE-2021-33467

This CVE-2021-33467 describes a use-after-free vulnerability in yasm version 1.3.0, specifically in the pp_getline() function in modules/preprocs/nasm/nasm-pp.c.

What is CVE-2021-33467?

CVE-2021-33467 is a vulnerability found in yasm version 1.3.0 that allows an attacker to exploit a use-after-free issue in the pp_getline() function.

The Impact of CVE-2021-33467

The impact of this vulnerability could lead to a potential arbitrary code execution or a Denial of Service (DoS) attack if exploited by a malicious actor.

Technical Details of CVE-2021-33467

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability exists in yasm version 1.3.0 due to a use-after-free issue in the pp_getline() function in modules/preprocs/nasm/nasm-pp.c.

Affected Systems and Versions

All systems running yasm version 1.3.0 are affected by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by crafting a malicious input that triggers the use-after-free condition in the pp_getline() function.

Mitigation and Prevention

To protect systems from CVE-2021-33467, it is crucial to take immediate action and follow long-term security practices.

Immediate Steps to Take

Update yasm to the latest patched version to mitigate the vulnerability.
Monitor for any suspicious activities on the system that could indicate an exploitation attempt.

Long-Term Security Practices

Regularly update software and dependencies to ensure all known vulnerabilities are patched.
Implement proper input validation to prevent similar use-after-free vulnerabilities.

Patching and Updates

Stay informed about security updates from yasm and apply patches as soon as they are released.