CVE-2019-14284 : Exploit Details and Defense Strategies

A vulnerability in the Linux kernel before version 5.2.3 can lead to a denial of service attack due to a division-by-zero error in the "floppy.c" driver.

Understanding CVE-2019-14284

This CVE describes a vulnerability in the Linux kernel that can be exploited by an unprivileged local user to cause a denial of service.

What is CVE-2019-14284?

Before version 5.2.3 of the Linux kernel, a vulnerability exists in the "floppy.c" driver that can be triggered by executing specific input/output control operations, leading to a division-by-zero error.

The Impact of CVE-2019-14284

The vulnerability allows an unprivileged local user to exploit the floppy driver, potentially causing a denial of service attack on the system.

Technical Details of CVE-2019-14284

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in the "floppy.c" driver of the Linux kernel before version 5.2.3 arises from a division-by-zero error in the "setup_format_params" function.

Affected Systems and Versions

The vulnerability affects Linux kernel versions before 5.2.3.

Exploitation Mechanism

Exploitation requires the execution of two consecutive input/output control operations (ioctls).
The first ioctl sets specific drive geometry values, triggering the division-by-zero error.
The second operation involves calling the floppy format operation.
The vulnerability can be exploited by an unprivileged local user, even without a physical floppy disk.

Mitigation and Prevention

Protecting systems from CVE-2019-14284 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Apply security updates provided by the Linux kernel to patch the vulnerability.
Monitor system logs for any suspicious activities that could indicate exploitation.

Long-Term Security Practices

Regularly update the Linux kernel to ensure all security patches are applied promptly.
Implement the principle of least privilege to restrict unprivileged users' access to critical system components.

Patching and Updates

Update to Linux kernel version 5.2.3 or newer to mitigate the vulnerability and enhance system security.