CVE-2020-1644 : Exploit Details and Defense Strategies

On Juniper Networks Junos OS and Junos OS Evolved devices, a vulnerability in BGP UPDATE packets can cause the routing protocols process to crash and restart.

Understanding CVE-2020-1644

This CVE impacts Juniper Networks Junos OS and Junos OS Evolved, potentially leading to a denial of service when processing specific BGP UPDATE packets.

What is CVE-2020-1644?

The vulnerability involves an incorrect internal counter incrementation, affecting both IBGP and EBGP multihop deployments in IPv4 or IPv6 networks on certain Junos OS and Junos OS Evolved versions.

The Impact of CVE-2020-1644

The vulnerability can cause the routing protocols process to crash and restart due to an internal counter being incorrectly incremented. This issue affects specific versions of Junos OS and Junos OS Evolved, potentially resulting in a denial of service.

Technical Details of CVE-2020-1644

This section provides a deeper insight into the vulnerability.

Vulnerability Description

The vulnerability in the receipt of BGP UPDATE packets on Juniper Networks devices can lead to RPD crashes and restarts, impacting the routing protocols process.

Affected Systems and Versions

Juniper Networks Junos OS versions 17.2X75 to 19.4 and Junos OS Evolved versions prior to 20.1R2-EVO are affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited through the receipt of specific BGP UPDATE packets causing the internal counter on affected devices to increment incorrectly, ultimately crashing RPD.

Mitigation and Prevention

To address CVE-2020-1644, take the following steps:

Immediate Steps to Take

Apply the provided software updates for Junos OS and Junos OS Evolved to mitigate the vulnerability.

Long-Term Security Practices

Regularly update your network infrastructure with the latest releases to prevent vulnerabilities.

Patching and Updates

Install the recommended software releases to address this specific issue on Junos OS and Junos OS Evolved.