CVE-2023-4273 : Security Advisory and Response

A flaw has been identified in the exFAT driver of the Linux kernel, designated as CVE-2023-4273. This vulnerability allows a local privileged attacker to trigger a stack overflow within the kernel by exploiting the implementation of the file name reconstruction function in the exFAT driver.

Understanding CVE-2023-4273

This section will delve into the specifics of the CVE-2023-4273 vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2023-4273?

CVE-2023-4273 is a vulnerability found in the exFAT driver of the Linux kernel. The flaw arises from the mishandling of file name reconstruction, potentially leading to a stack overflow when a local privileged attacker utilizes this vulnerability to manipulate the kernel stack.

The Impact of CVE-2023-4273

The impact of CVE-2023-4273 can be significant, as it allows attackers with local privileges to execute arbitrary code or crash the affected system, compromising the confidentiality and integrity of the system.

Technical Details of CVE-2023-4273

In this section, we will explore the vulnerability description, affected systems and versions, and the exploitation mechanism of CVE-2023-4273.

Vulnerability Description

The vulnerability in the exFAT driver of the Linux kernel involves a stack-based buffer overflow caused by the incorrect handling of file name reconstruction, leading to potential exploitation by local privileged attackers.

Affected Systems and Versions

Kernel Version: 6.5-rc5 (unaffected)
Red Hat Enterprise Linux 9: kernel versions 5.14.0-362.8.1.el9_3 (affected)
Red Hat Enterprise Linux 6, 7, 8: Some versions unaffected
Fedora: Affected

Exploitation Mechanism

Attackers with local privileges can exploit CVE-2023-4273 by leveraging the vulnerable file name reconstruction function in the exFAT driver to cause a stack overflow in the kernel stack.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-4273, immediate actions should be taken to address the vulnerability and prevent potential exploitation.

Immediate Steps to Take

Update the affected systems with the necessary patches provided by the vendor.
Monitor system activity for any signs of exploitation.
Restrict access to privileged users to minimize the impact of potential attacks.

Long-Term Security Practices

Implement regular security updates and patches for the kernel and related components.
Conduct security audits and vulnerability assessments to identify and address potential weaknesses.
Educate users on best practices for system security and secure coding standards.

Patching and Updates

Refer to the vendor's security advisory (RHSA-2023:6583) for detailed information on patches and updates related to CVE-2023-4273. Regularly check for updates from the vendor to ensure the system is protected against known vulnerabilities.

This comprehensive overview of CVE-2023-4273 highlights the critical nature of the vulnerability and provides guidance on mitigating and preventing potential risks to affected systems.