CVE-2020-1632 : Vulnerability Insights and Analysis

This CVE-2020-1632 article provides detailed information about an invalid BGP UPDATE vulnerability affecting Junos OS and Junos OS Evolved.

Understanding CVE-2020-1632

This CVE involves a specific BGP UPDATE message triggering Juniper Networks devices to send invalid messages, leading to a Denial of Service.

What is CVE-2020-1632?

In the context of this CVE, a particular BGP UPDATE message can cause Juniper Networks Junos OS and Junos OS Evolved devices to relay incorrect BGP messages to other peers, resulting in BGP session terminations.

The Impact of CVE-2020-1632

The vulnerability leads to a Denial of Service situation due to the transmission of erroneous BGP UPDATE messages, potentially disrupting BGP sessions.

Technical Details of CVE-2020-1632

This section outlines the vulnerability's technical specifics.

Vulnerability Description

A specific BGP UPDATE message triggers devices to broadcast invalid BGP messages, leading to BGP session terminations and subsequent DoS conditions.

Affected Systems and Versions

Junos OS versions 16.1 to 19.2 and 18.4R2 and later are affected.
Junos OS Evolved versions before 19.2R2-EVO are impacted.

Exploitation Mechanism

Juniper SIRT has not identified any cases of malicious exploitation for this specific vulnerability.

Mitigation and Prevention

Below are measures to mitigate and prevent exploitation of CVE-2020-1632.

Immediate Steps to Take

Apply provided patches immediately after reviewing version compatibility.

Long-Term Security Practices

Regularly update and patch network devices to prevent vulnerabilities.
Ensure BGP peers support 4-Byte AS extensions to avoid triggering the vulnerability.

Patching and Updates

Junos OS: Apply patches starting from 16.1R7-S6 up to subsequent releases.
Junos OS Evolved: Implement fixes from 19.2R2-EVO onwards.