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CVE-2019-5612 : Vulnerability Insights and Analysis

Learn about CVE-2019-5612 affecting FreeBSD versions before 12.0-RELEASE-p10, 11.3-RELEASE-p3, and 11.2-RELEASE-p14. Discover the impact, technical details, and mitigation steps for this kernel driver vulnerability.

A vulnerability in the FreeBSD kernel driver for /dev/midistat allows unauthorized access to kernel memory. Attackers can exploit this flaw to manipulate races in the handler, potentially leading to security breaches.

Understanding CVE-2019-5612

This CVE affects FreeBSD versions before 12.0-RELEASE-p10, 11.3-RELEASE-p3, and 11.2-RELEASE-p14.

What is CVE-2019-5612?

Prior to specific releases in FreeBSD, a vulnerability exists in the kernel driver for /dev/midistat due to a non-thread-safe read handler. This flaw can be exploited by multi-threaded programs to access kernel memory beyond the data buffer limits.

The Impact of CVE-2019-5612

The vulnerability can result in unauthorized access to kernel memory, potentially leading to security breaches and exploitation by malicious actors.

Technical Details of CVE-2019-5612

The technical aspects of this CVE are as follows:

Vulnerability Description

The kernel driver for /dev/midistat in FreeBSD is susceptible to unauthorized access due to a non-thread-safe read handler.

Affected Systems and Versions

        FreeBSD versions before 12.0-RELEASE-p10
        FreeBSD versions before 11.3-RELEASE-p3
        FreeBSD versions before 11.2-RELEASE-p14

Exploitation Mechanism

Attackers can exploit the vulnerability by using multi-threaded programs to manipulate races in the handler, allowing unauthorized access to kernel memory.

Mitigation and Prevention

To address CVE-2019-5612, consider the following steps:

Immediate Steps to Take

        Apply the necessary patches provided by FreeBSD promptly.
        Monitor security advisories for updates and follow best practices for secure coding.

Long-Term Security Practices

        Regularly update FreeBSD systems to the latest stable releases.
        Implement secure coding practices and conduct regular security audits.

Patching and Updates

        Ensure that FreeBSD systems are updated to versions 12.0-RELEASE-p10, 11.3-RELEASE-p3, or 11.2-RELEASE-p14 to mitigate the vulnerability.

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