CVE-2019-0067 : Vulnerability Insights and Analysis

This CVE-2019-0067 article provides insights into a vulnerability in Junos OS that could lead to a kernel crash upon receiving a specific link-local IPv6 packet on devices configured with Multi-Chassis Link Aggregation Group (MC-LAG).

Understanding CVE-2019-0067

This section delves into the details of the vulnerability and its impact.

What is CVE-2019-0067?

The vulnerability involves a system crash and restart (vmcore) triggered by a crafted IPv6 packet, potentially leading to a Denial of Service (DoS) attack. It affects specific versions of Juniper Networks Junos OS.

The Impact of CVE-2019-0067

The vulnerability allows an attacker to repeatedly crash the system, causing an extended DoS condition. However, there have been no reported malicious exploitations of this vulnerability.

Technical Details of CVE-2019-0067

This section outlines the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from receiving a particular link-local IPv6 packet directed to the RE, resulting in a system crash and restart. Continuous sending of the crafted packet can lead to a prolonged DoS attack.

Affected Systems and Versions

Junos OS versions 16.1 prior to 16.1R6-S2 and 16.1R7
Junos OS 16.2 versions prior to 16.2R2-S10
Junos OS 17.1 versions prior to 17.1R3
Not affecting Junos OS version 15.1 and earlier releases

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Adjacent Network
Availability Impact: High
Base Score: 6.5 (Medium Severity)
No privileges required for exploitation

Mitigation and Prevention

Learn how to address and prevent the CVE-2019-0067 vulnerability.

Immediate Steps to Take

Update to the fixed software releases: 16.1R6-S2, 16.1R7, 16.2R2-S10, 17.1R3, 17.2R1, and subsequent versions

Long-Term Security Practices

Regularly monitor and apply security patches
Implement network segmentation and access controls
Conduct security training for staff

Patching and Updates

Ensure timely installation of software updates and patches to mitigate the vulnerability.