CVE-2021-33463 : Security Advisory and Response

An issue was discovered in yasm version 1.3.0 that leads to a NULL pointer dereference in yasm_expr__copy_except().

Understanding CVE-2021-33463

This CVE identifies a vulnerability in yasm version 1.3.0, specifically in the yasm_expr__copy_except() function within the libyasm/expr.c file.

What is CVE-2021-33463?

CVE-2021-33463 is a NULL pointer dereference vulnerability present in yasm version 1.3.0. This vulnerability may allow an attacker to cause a denial of service or potentially execute arbitrary code by exploiting the issue.

The Impact of CVE-2021-33463

Exploitation of this vulnerability could lead to a crash of the application or could potentially allow an attacker to take control of the affected system.

Technical Details of CVE-2021-33463

This section provides more detailed information about the vulnerability.

Vulnerability Description

The vulnerability involves a NULL pointer dereference in the yasm_expr__copy_except() function in libyasm/expr.c, found in yasm version 1.3.0.

Affected Systems and Versions

The vulnerability affects yasm version 1.3.0.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious input that triggers the NULL pointer dereference in the yasm_expr__copy_except() function.

Mitigation and Prevention

To address CVE-2021-33463, it is crucial to take immediate action and follow security best practices.

Immediate Steps to Take

Users are advised to update yasm to a patched version, if available. Additionally, implementing input validation mechanisms can help mitigate the risk of exploitation.

Long-Term Security Practices

Regularly updating software, maintaining a robust cybersecurity posture, and staying informed about security vulnerabilities are essential for long-term security.

Patching and Updates

Vendor patches and updates should be promptly applied to ensure that systems are protected against known vulnerabilities.