CVE-2021-34123 : Security Advisory and Response

An issue was discovered on atasm, version 1.09, where a stack-buffer-overflow vulnerability allows attackers to execute arbitrary code on the system via a crafted file.

Understanding CVE-2021-34123

This section will provide insights into the impact and technical details of CVE-2021-34123.

What is CVE-2021-34123?

CVE-2021-34123 pertains to a stack-buffer-overflow vulnerability in function aprintf() in asm.c in atasm version 1.09. This flaw enables threat actors to carry out arbitrary code execution on the affected system.

The Impact of CVE-2021-34123

The impact of this vulnerability is severe as it allows malicious actors to execute unauthorized commands on the system by exploiting the stack-buffer-overflow issue.

Technical Details of CVE-2021-34123

This section elaborates on the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability exists in the aprintf() function in asm.c of atasm version 1.09, leading to a stack-buffer-overflow condition that can be abused to achieve arbitrary code execution.

Affected Systems and Versions

The vulnerability affects atasm version 1.09. No specific vendor or product is mentioned, implying that any system running this version is vulnerable to exploitation.

Exploitation Mechanism

By crafting a malicious file and leveraging the stack-buffer-overflow vulnerability in the aprintf() function, threat actors can execute arbitrary code on the targeted system.

Mitigation and Prevention

In this section, we will discuss the immediate steps, as well as long-term security practices to mitigate the risks associated with CVE-2021-34123.

Immediate Steps to Take

Users are advised to update atasm to a patched version or apply relevant security updates to prevent exploitation. Avoid opening untrusted files to mitigate risks.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and educate users about safe file handling to enhance overall system security.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by the software maintainers to address vulnerabilities like CVE-2021-34123.