An Unchecked Return Value vulnerability in the Routing Protocol Daemon (rpd) on Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows a logically adjacent, unauthenticated attacker sending a specific PIM packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS), when PIM is configured with Multicast-only Fast Reroute (MoFRR). Continued receipt and processing of this packet may create a sustained Denial of Service (DoS) condition.

This issue is observed on Junos and Junos Evolved platforms where PIM is configured along with MoFRR. MoFRR tries to select the active path, but due to an internal timing issue, rpd is unable to select the forwarding next-hop towards the source, resulting in an rpd crash.
 

This issue affects:

Junos OS:

• All versions before 20.4R3-S10,
• from 21.2 before 21.2R3-S7,
• from 21.4 before 21.4R3-S6,
• from 22.1 before 22.1R3-S5,
• from 22.2 before 22.2R3-S3,
• from 22.3 before 22.3R3,
• from 22.4 before 22.4R2; 

Junos OS Evolved:

• All versions before 20.4R3-S10 -EVO,
• All versions of 21.2-EVO,
• from 21.4-EVO before 21.4R3-S9-EVO,
• from 22.1-EVO before 22.1R3-S5 -EVO,
• from 22.2-EVO before 22.2R3-S3-EVO,
• from 22.3-EVO before 22.3R3-EVO,
• from 22.4-EVO before 22.4R2-EVO.

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

This issue was found during internal product security testing or research.
 

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

Junos: 20.4R3-S10, 21.2R3-S7, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3, 22.4R2, 23.2R1, and all subsequent releases.
Junos OS Evolved: 20.4R3-S10-EVO, 21.4R3-S9-EVO, 22.1R3-S5-EVO, 22.2R3-S3-EVO, 22.3R3-EVO, 22.4R2-EVO, 23.2R1-EVO, and all subsequent releases.

This issue is being tracked as 1709038 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).
 

2024-07-10: Initial Publication
2024-08-08: Updated list of EVO affected and fixed releases
2024-09-13: Minor formatting change to CVSS field

• 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
• https://www.cve.org/CVERecord?id=CVE-2024-39558