CVE-2019-0031 Explained : Impact and Mitigation

A Junos OS device using the jdhcpd daemon may face memory resource consumption issues when specific IPv6 DHCP packets are received, potentially leading to a Denial of Service situation.

Understanding CVE-2019-0031

This CVE involves a vulnerability in Junos OS that affects memory consumption when handling IPv6 DHCP packets.

What is CVE-2019-0031?

The jdhcpd daemon in Junos OS may experience memory resource consumption problems with specific IPv6 DHCP packets, impacting both IPv4 and IPv6 requests.
Failover events may cause issues with IPv6 Identity Association (IA) address and network tables, resulting in denial of multiple IP addresses.

The Impact of CVE-2019-0031

Severity: High (CVSS Base Score: 7.4)
Attack Vector: Adjacent Network
Availability Impact: High
No impact on Confidentiality or Integrity

Technical Details of CVE-2019-0031

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Junos OS devices using jdhcpd daemon may suffer memory resource consumption problems with specific IPv6 DHCP packets.

Affected Systems and Versions

Affected Versions: Junos OS versions prior to 17.4R2 and 18.1R2

Exploitation Mechanism

No known malicious exploitation reported by Juniper SIRT

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2019-0031 vulnerability.

Immediate Steps to Take

Update to fixed software releases: 17.4R2, 18.1R2, 18.2R1, or later
Discontinue processing DHCPv6 address assignments temporarily

Long-Term Security Practices

Regularly update Junos OS to the latest versions
Monitor and restrict memory consumption on devices

Patching and Updates

Apply the provided software releases to resolve the vulnerability