CVE-2017-2647 : Vulnerability Insights and Analysis

CVE-2017-2647 was published on March 31, 2017, and affects the KEYS subsystem in Linux kernel versions prior to 3.18. This vulnerability allows local individuals to elevate privileges or launch a denial of service attack, potentially leading to system crashes and NULL pointer dereference.

Understanding CVE-2017-2647

This CVE entry highlights a security flaw in the Linux kernel's KEYS subsystem that can be exploited by local users to escalate privileges or disrupt system operations.

What is CVE-2017-2647?

The vulnerability in the KEYS subsystem of Linux kernels before version 3.18 enables local attackers to raise their privileges or cause a denial of service by triggering a system crash and NULL pointer dereference. The issue stems from handling a NULL value for a specific match field within the keyring_search_iterator function in keyring.c.

The Impact of CVE-2017-2647

The exploitation of this vulnerability can result in severe consequences, including unauthorized elevation of privileges and system instability due to crashes and NULL pointer dereference.

Technical Details of CVE-2017-2647

This section delves into the technical aspects of CVE-2017-2647.

Vulnerability Description

The vulnerability allows local users to exploit the KEYS subsystem in Linux kernels prior to version 3.18, leading to privilege escalation and denial of service attacks.

Affected Systems and Versions

Affected: Linux kernel versions prior to 3.18
Not affected: N/A

Exploitation Mechanism

The vulnerability arises from mishandling a NULL value for a specific match field within the keyring_search_iterator function in keyring.c.

Mitigation and Prevention

To address CVE-2017-2647, follow these mitigation strategies:

Immediate Steps to Take

Apply relevant security patches provided by the Linux kernel maintainers.
Monitor system logs for any unusual activities that might indicate exploitation attempts.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access rights.
Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.

Patching and Updates

Stay informed about security advisories from Linux distributions and promptly apply recommended patches to secure your system.