CVE-2018-7755 : What You Need to Know

A vulnerability was detected in the Linux kernel version 4.15.7 that affects the fd_locked_ioctl function in drivers/block/floppy.c. This flaw allows an attacker to determine the precise location of kernel code and data, potentially leading to the circumvention of important kernel security measures such as KASLR.

Understanding CVE-2018-7755

This CVE identifies a vulnerability in the Linux kernel that could be exploited by an attacker to bypass kernel security measures.

What is CVE-2018-7755?

CVE-2018-7755 is a security vulnerability found in the Linux kernel version 4.15.7, specifically in the fd_locked_ioctl function in drivers/block/floppy.c. It allows an attacker to obtain a kernel pointer and potentially compromise kernel security.

The Impact of CVE-2018-7755

The vulnerability in the Linux kernel could enable an attacker to determine the exact location of kernel code and data, potentially leading to the bypassing of crucial security measures like KASLR.

Technical Details of CVE-2018-7755

This section provides more technical insights into the CVE-2018-7755 vulnerability.

Vulnerability Description

The issue lies in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel through version 4.15.7. The flaw allows the floppy driver to transfer a kernel pointer to user memory when the FDGETPRM ioctl command is invoked, which can be exploited by an attacker.

Affected Systems and Versions

Affected System: Linux kernel version 4.15.7
Affected Function: fd_locked_ioctl in drivers/block/floppy.c

Exploitation Mechanism

The vulnerability occurs when the FDGETPRM ioctl command is used, inadvertently transferring a kernel pointer to user memory.
An attacker can exploit this flaw to determine the location of kernel code and data, potentially bypassing security measures.

Mitigation and Prevention

Protecting systems from CVE-2018-7755 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers to address the vulnerability.
Monitor official sources for security advisories and updates related to the Linux kernel.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
Implement strict access controls and monitoring mechanisms to detect and prevent unauthorized access.

Patching and Updates

Stay informed about security updates and patches released by the Linux kernel maintainers.
Promptly apply patches to ensure the security of the system.