CVE-2018-11412 : Vulnerability Insights and Analysis

CVE-2018-11412 was published on May 24, 2018, and affects the Linux kernel versions 4.13 through 4.16.11. The vulnerability lies in the ext4_read_inline_data() function in fs/ext4/inline.c, which can lead to a memcpy operation using an untrusted length value under specific conditions.

Understanding CVE-2018-11412

This CVE entry highlights a vulnerability in the Linux kernel that could be exploited under certain filesystem manipulation scenarios.

What is CVE-2018-11412?

The ext4_read_inline_data() function in the Linux kernel's ext4 filesystem module is susceptible to a memcpy operation with an untrusted length value when handling a manipulated filesystem storing the system.data extended attribute value in a separate inode.

The Impact of CVE-2018-11412

The vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service (DoS) condition on a targeted system.

Technical Details of CVE-2018-11412

This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The ext4_read_inline_data() function in fs/ext4/inline.c performs a memcpy operation with an untrusted length value in specific circumstances involving a crafted filesystem storing the system.data extended attribute value in a dedicated inode.

Affected Systems and Versions

Linux kernel versions 4.13 through 4.16.11

Exploitation Mechanism

The vulnerability arises due to a flaw in handling the length value during the memcpy operation, which can be triggered by manipulating the filesystem structure.

Mitigation and Prevention

To address CVE-2018-11412, immediate steps should be taken to mitigate the risk and prevent potential exploitation.

Immediate Steps to Take

Apply relevant security patches provided by the Linux kernel maintainers.
Monitor official sources for updates and advisories regarding this vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
Implement filesystem integrity checks and monitoring to detect any unauthorized changes.

Patching and Updates

Ensure timely installation of security patches released by the Linux kernel community to address the CVE-2018-11412 vulnerability.