CVE-2019-14283 : Security Advisory and Response

A vulnerability in the Linux kernel before version 5.2.3 could allow a local user to trigger an out-of-bounds read by exploiting a flaw in the floppy disk driver.

Understanding CVE-2019-14283

This CVE identifies a security issue in the Linux kernel related to floppy disk handling.

What is CVE-2019-14283?

Prior to version 5.2.3 of the Linux kernel, the 'set_geometry' function in 'drivers/block/floppy.c' does not properly validate certain fields, leading to an integer overflow and out-of-bounds read. This vulnerability can be exploited by a local user with limited privileges when a floppy disk is inserted, particularly notable in QEMU environments.

The Impact of CVE-2019-14283

The vulnerability could allow an attacker to execute arbitrary code or disclose sensitive information by inserting a specially crafted floppy disk.

Technical Details of CVE-2019-14283

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The flaw arises from inadequate validation of specific fields in the floppy disk driver, resulting in an integer overflow and subsequent out-of-bounds read.

Affected Systems and Versions

Linux kernel versions before 5.2.3 are vulnerable to this issue.

Exploitation Mechanism

An unprivileged local user can exploit this vulnerability by inserting a floppy disk, triggering the out-of-bounds read.

Mitigation and Prevention

Protecting systems from CVE-2019-14283 involves taking immediate and long-term security measures.

Immediate Steps to Take

Apply relevant security updates and patches promptly.
Monitor system logs for any suspicious activities related to floppy disk operations.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access and mitigate potential risks.
Regularly review and update security configurations to address emerging threats.

Patching and Updates

Update the Linux kernel to version 5.2.3 or newer to mitigate the vulnerability.