CVE-2018-11508 : Security Advisory and Response

CVE-2018-11508 was published on May 28, 2018, and affects Linux kernels prior to version 4.16.9. This vulnerability allows local users to access confidential data stored in the kernel memory.

Understanding CVE-2018-11508

What is CVE-2018-11508?

The vulnerability in the Linux kernel before version 4.16.9 allows local users to obtain sensitive information from kernel memory via the adjtimex function.

The Impact of CVE-2018-11508

This vulnerability enables local users to gain unauthorized access to confidential data stored in the kernel memory, potentially leading to further system compromise.

Technical Details of CVE-2018-11508

Vulnerability Description

The issue lies in the compat_get_timex function in kernel/compat.c, which can be exploited by local users to access sensitive kernel memory information.

Affected Systems and Versions

Linux kernels prior to version 4.16.9

Exploitation Mechanism

Local users can exploit the adjtimex function through the compat_get_timex function in kernel/compat.c to gain access to confidential kernel memory data.

Mitigation and Prevention

Immediate Steps to Take

Update to Linux kernel version 4.16.9 or later to mitigate the vulnerability.
Monitor system logs for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access to sensitive system components.
Regularly review and update security configurations to address potential vulnerabilities.

Patching and Updates

Stay informed about security advisories and patches released by Linux kernel maintainers to promptly apply necessary updates.