CVE-2019-0056 Explained : Impact and Mitigation

This CVE involves a Denial of Service (DoS) vulnerability in Juniper Networks Junos OS affecting MX Series devices due to OSPF states transitioning to Down, causing traffic disruption.

Understanding CVE-2019-0056

This vulnerability impacts devices with multiple MPC10's in a single chassis with OSPF enabled, potentially leading to a DoS attack.

What is CVE-2019-0056?

Vulnerability in Juniper Networks Junos OS on MX Series devices
Attack exploits Insufficient Resource Pool weakness to disrupt OSPF states
Requires sending specific IPv6 packets to trigger DoS

The Impact of CVE-2019-0056

Attacker can cause OSPF states to transition to Down, affecting IPv4 and IPv6 traffic
Results in Denial of Service (DoS) attack

Technical Details of CVE-2019-0056

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Devices with multiple MPC10's susceptible to DoS via OSPF states transition
Attacker exploits Insufficient Resource Pool weakness

Affected Systems and Versions

Juniper Networks Junos OS on MX480, MX960, MX2008, MX2010, MX2020
Versions: 18.1, 18.2, 18.2X75, 18.3, 18.4

Exploitation Mechanism

Attacker sends specific IPv6 packets across multiple PFE's to trigger DoS
Requires sending a large number of genuine packets in a short time

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2019-0056 vulnerability.

Immediate Steps to Take

Update to fixed software releases: 18.1R2-S4, 18.1R3-S5, 18.2R1-S5, 18.2R2-S3, 18.2R3, 18.2X75-D50, 18.3R1-S4, 18.3R2, 18.3R3, 18.4R1-S2, 18.4R2, 19.1R1

Long-Term Security Practices

Regularly monitor and update network devices
Implement network segmentation and access controls

Patching and Updates

Ensure all devices are running the latest Junos OS software