An Improper Control of a Resource Through its Lifetime vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows unauthenticated adjacent attacker to cause a Denial of Service (DoS).

In an EVPN-MPLS scenario, if MAC is learned locally on access interface but later a request to delete is received indicating that the MAC was learnt remotely, it might lead to memory corruption which might result in line card crash and reload.

This issue affects:

Juniper Networks Junos OS

• All versions 17.3R1 and later versions prior to 19.2R3-S5;
• 19.3 versions prior to 19.3R3-S5;
• 19.4 versions prior to 19.4R2-S6, 19.4R3-S8;
• 20.1 version 20.1R1 and later versions;
• 20.2 versions prior to 20.2R3-S4;
• 20.3 versions prior to 20.3R3-S3;
• 20.4 versions prior to 20.4R3-S3;
• 21.1 versions prior to 21.1R3-S1;
• 21.2 versions prior to 21.2R3;
• 21.3 versions prior to 21.3R2;
• 21.4 versions prior to 21.4R1-S1, 21.4R2.

Juniper Networks Junos OS Evolved

• All versions prior to 20.4R3-S3-EVO;
• 21.1-EVO version 21.1R1-EVO and later versions;
• 21.2-EVO versions prior to 21.2R3-EVO;
• 21.3-EVO versions prior to 21.3R2-EVO;
• 21.4-EVO versions prior to 21.4R1-S1-EVO, 21.4R2-EVO.

This issue does not affect Juniper Networks Junos OS versions prior to 17.3R1.

To be exposed to this vulnerability a device would need to be configured with EVPN MPLS as follows:

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2022-22250.

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

Junos OS: 19.2R3-S5, 19.3R3-S5, 19.4R2-S6, 19.4R3-S8, 20.2R3-S4, 20.3R3-S3, 20.4R3-S3, 21.1R3-S1, 21.2R3, 21.3R2, 21.4R1-S1, 21.4R2, 22.1R1, and all subsequent releases;

Junos OS Evolved: 20.4R3-S3-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-S1-EVO, 21.4R2-EVO, 22.1R1-EVO, and all subsequent releases

This issue is being tracked as PR 1627617 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/.

• 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-2022-22250 at cve.mitre.org