CVE-2021-33464 : Exploit Details and Defense Strategies

An issue was discovered in yasm version 1.3.0 that leads to a heap-buffer-overflow in inc_fopen() in modules/preprocs/nasm/nasm-pp.c.

Understanding CVE-2021-33464

This CVE highlights a vulnerability in yasm version 1.3.0, specifically in the inc_fopen() function within modules/preprocs/nasm/nasm-pp.c.

What is CVE-2021-33464?

CVE-2021-33464 is a heap-buffer-overflow vulnerability affecting the yasm assembler tool version 1.3.0. The issue arises in the inc_fopen() function in a specific module.

The Impact of CVE-2021-33464

Exploitation of this vulnerability could lead to a heap-buffer-overflow, potentially resulting in arbitrary code execution or denial of service.

Technical Details of CVE-2021-33464

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises due to a heap-buffer-overflow in the inc_fopen() function within modules/preprocs/nasm/nasm-pp.c.

Affected Systems and Versions

The vulnerability affects yasm version 1.3.0.

Exploitation Mechanism

Attackers can exploit this vulnerability to trigger a heap-buffer-overflow by manipulating the input to the inc_fopen() function.

Mitigation and Prevention

To safeguard systems from CVE-2021-33464, prompt actions and security measures need to be implemented.

Immediate Steps to Take

Users are advised to update yasm to a non-vulnerable version, if available. Limit exposure to untrusted input that may trigger the vulnerability.

Long-Term Security Practices

Maintain regular software updates, employ secure coding practices, and conduct security audits to identify and address vulnerabilities timely.

Patching and Updates

Stay informed about security updates released by yasm and apply patches promptly to mitigate the risk posed by CVE-2021-33464.