Due to the Improper Handling of an Unexpected Data Type in the processing of EVPN routes on Juniper Networks Junos OS and Junos OS Evolved, an attacker in direct control of a BGP client connected to a route reflector, or via a machine in the middle (MITM) attack, can send a specific EVPN route contained within a BGP Update, triggering a routing protocol daemon (RPD) crash, leading to a Denial of Service (DoS) condition. Continued receipt and processing of these specific EVPN routes could create a sustained Denial of Service (DoS) condition.
 

This issue only occurs on BGP route reflectors, only within a BGP EVPN multicast environment, and only when one or more BGP clients have 'leave-sync-route-oldstyle' enabled.
 

This issue affects:

Juniper Networks Junos OS

• 21.3 versions prior to 21.3R3-S2;
• 21.4 versions prior to 21.4R2-S2, 21.4R3;
• 22.1 versions prior to 22.1R1-S2, 22.1R3;
• 22.2 versions prior to 22.2R2.

Juniper Networks Junos OS Evolved

• 21.3 version 21.3R1-EVO and later versions prior to 21.4R3-EVO;
• 22.1 versions prior to 22.1R1-S2-EVO, 22.1R3-EVO;
• 22.2 versions prior to 22.2R2-EVO.

This issue does not affect:

• Juniper Networks Junos OS versions prior to 21.3R1.
• Juniper Networks Junos OS Evolved versions prior to 21.3R1-EVO.

This issue can occur when the following configuration is enabled on the route reflector clients:

and when EVPN is configured on the route reflector:

This issue has been assigned CVE-2022-22219 .

The following software releases have been updated to resolve this specific issue:

Junos OS 21.3R3-S2, 21.4R2-S2, 21.4R3, 22.1R1-S2, 22.1R3, 22.2R2, 22.3R1, and all subsequent releases.

Junos OS Evolved 21.4R3-EVO, 22.1R1-S2-EVO, 22.1R3-EVO, 22.2R2-EVO, 22.3R1-EVO, and all subsequent releases.

This issue is being tracked as 1675054 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

IMPLEMENTATION:

Software Releases, patches and updates are available at https://support.juniper.net/support/downloads/.

2022-10-12: Initial Publication
2022-10-17: Fixed typo in CVE ID

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2022-22219 at cve.mitre.org
• https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/ref/statement/evpn-edit-routing-instances-protocols.html