CVE-2019-0037 : Vulnerability Insights and Analysis

In an environment using Dynamic Host Configuration Protocol version 6 (DHCPv6), the jdhcpd daemon can experience crashes and restarts when it receives certain DHCPv6 solicit messages from a DHCPv6 client. An attacker can exploit this vulnerability by continuously sending specially crafted packets, causing the jdhcpd process to crash repeatedly. This results in a sustained Denial of Service (DoS) for both IPv4 and IPv6 clients. The affected releases include Juniper Networks Junos OS versions: 15.1 (prior to 15.1F6-S12, 15.1R7-S3); 15.1X49 (prior to 15.1X49-D171, 15.1X49-D180); 15.1X53 (prior to 15.1X53-D236, 15.1X53-D496); 16.1 (prior to 16.1R3-S10, 16.1R7-S4); 16.2 (prior to 16.2R2-S8); 17.1 (prior to 17.1R2-S10, 17.1R3); 17.2 (prior to 17.2R1-S8, 17.2R3-S1); 17.3 (prior to 17.3R3-S3); 17.4 (prior to 17.4R1-S6, 17.4R2-S3); 18.1 (prior to 18.1R2-S4, 18.1R3-S2); 18.2 (prior to 18.2R2); 18.2X75 (prior to 18.2X75-D30); 18.3 (prior to 18.3R1-S2). This vulnerability does not affect Junos OS releases earlier than version 15.1.

Understanding CVE-2019-0037

This CVE involves a vulnerability in Juniper Networks Junos OS that allows for a Denial of Service (DoS) attack through the jdhcpd daemon when receiving specific DHCPv6 solicit messages.

What is CVE-2019-0037?

CVE-2019-0037 is a vulnerability in Juniper Networks Junos OS that can be exploited by an attacker to crash the jdhcpd process, leading to a sustained DoS for both IPv4 and IPv6 clients.

The Impact of CVE-2019-0037

The impact of this vulnerability is a sustained Denial of Service (DoS) for both IPv4 and IPv6 clients due to crashes and restarts of the jdhcpd daemon.

Technical Details of CVE-2019-0037

In-depth technical information about the vulnerability.

Vulnerability Description

The jdhcpd daemon in Juniper Networks Junos OS can crash and restart when receiving specific DHCPv6 solicit messages, leading to a DoS condition for clients.

Affected Systems and Versions

Junos OS 15.1 (prior to 15.1F6-S12, 15.1R7-S3)
Junos OS 15.1X49 (prior to 15.1X49-D171, 15.1X49-D180)
Junos OS 15.1X53 (prior to 15.1X53-D236, 15.1X53-D496)
Junos OS 16.1 (prior to 16.1R3-S10, 16.1R7-S4)
Junos OS 16.2 (prior to 16.2R2-S8)
Junos OS 17.1 (prior to 17.1R2-S10, 17.1R3)
Junos OS 17.2 (prior to 17.2R1-S8, 17.2R3-S1)
Junos OS 17.3 (prior to 17.3R3-S3)
Junos OS 17.4 (prior to 17.4R1-S6, 17.4R2-S3)
Junos OS 18.1 (prior to 18.1R2-S4, 18.1R3-S2)
Junos OS 18.2 (prior to 18.2R2)
Junos OS 18.2X75 (prior to 18.2X75-D30)
Junos OS 18.3 (prior to 18.3R1-S2)

Exploitation Mechanism

The vulnerability can be exploited by continuously sending specially crafted DHCPv6 solicit messages to the jdhcpd daemon, causing it to crash and restart, resulting in a DoS condition.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2019-0037 vulnerability.

Immediate Steps to Take

Apply the provided software updates for Junos OS versions mentioned in the solution section.

Long-Term Security Practices

Regularly update Junos OS to the latest patched versions.
Monitor network traffic for any unusual DHCPv6 solicit messages.

Patching and Updates

Ensure all affected Junos OS versions are updated to the patched releases mentioned in the solution section.