CVE-2020-1646 Explained : Impact and Mitigation

On Juniper Networks Junos OS and Junos OS Evolved devices, processing a specific UPDATE for an EBGP peer can lead to a routing process daemon (RPD) crash and restart. This issue affects specific versions of Junos OS and Junos OS Evolved.

Understanding CVE-2020-1646

What is CVE-2020-1646?

CVE-2020-1646 relates to a vulnerability found in Juniper Networks Junos OS and Junos OS Evolved devices when processing a particular BGP UPDATE for an EBGP peer.

The Impact of CVE-2020-1646

This vulnerability can result in a routing process daemon (RPD) crash and restart, leading to a Denial of Service (DoS) condition. It affects specific versions of Junos OS and Junos OS Evolved.

Technical Details of CVE-2020-1646

Vulnerability Description

The issue arises when processing a specific BGP UPDATE for an EBGP peer, causing RPD to crash, with possible implications for DoS attacks.

Affected Systems and Versions

Junos OS: 17.3R3-S6, 17.4R2-S7, 18.1R3-S7
Junos OS Evolved: 19.2R2-EVO and versions below 19.3R1-EVO

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
Availability Impact: High

Mitigation and Prevention

Immediate Steps to Take

Apply the following updated software releases: Junos OS 17.3R3-S7, 17.4R2-S8, 18.1R3-S8, and subsequent versions.
For Junos OS Evolved, install version 19.3R1-EVO or newer.

Long-Term Security Practices

Regularly update software to the latest patched versions.
Monitor for official security advisories and apply recommended fixes promptly.

Patching and Updates

Ensure software updates are proactively applied to protect against identified vulnerabilities.