CVE-2017-5967 : Vulnerability Insights and Analysis

If CONFIG_TIMER_STATS is enabled, the time subsystem in the Linux kernel up to version 4.9.9 may pose a security risk, allowing local users to access actual PID values. This vulnerability is associated with specific functions in the kernel.

Understanding CVE-2017-5967

This CVE entry highlights a security issue in the Linux kernel related to the time subsystem.

What is CVE-2017-5967?

The vulnerability in the Linux kernel, up to version 4.9.9, enables local users to obtain real PID values by examining the /proc/timer_list file, potentially compromising system security.

The Impact of CVE-2017-5967

The security risk associated with this CVE allows unauthorized users to access sensitive PID information within the kernel, potentially leading to further system exploitation.

Technical Details of CVE-2017-5967

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises when CONFIG_TIMER_STATS is enabled, exposing real PID values to local users through the /proc/timer_list file. It is linked to specific functions within the kernel code.

Affected Systems and Versions

Linux kernel up to version 4.9.9

Exploitation Mechanism

The vulnerability allows local users to view actual PID values, bypassing the restrictions of PID namespaces, by leveraging specific functions in the kernel code.

Mitigation and Prevention

Protecting systems from CVE-2017-5967 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable CONFIG_TIMER_STATS if not essential for system operation
Regularly monitor system logs for any suspicious activities

Long-Term Security Practices

Implement the principle of least privilege to restrict user access
Keep the Linux kernel updated with the latest security patches

Patching and Updates

Ensure timely installation of kernel updates and security patches to address vulnerabilities like CVE-2017-5967.