An Improper Check or Handling of Exceptional Conditions vulnerability in packet processing on the network interfaces of Juniper Networks Junos OS on JRR200 route reflector appliances allows an adjacent, network-based attacker sending a specific packet to the device to cause a kernel crash, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.

This issue can only be triggered by an attacker on the local broadcast domain. Packets routed to the device are unable to trigger this crash.

This issue affects Juniper Networks Junos OS on JRR200:

• All versions prior to 21.2R3-S4;
• 21.3 versions prior to 21.3R3-S4;
• 21.4 versions prior to 21.4R3-S3;
• 22.1 versions prior to 22.1R3-S1;
• 22.2 versions prior to 22.2R2-S2, 22.2R3;
• 22.3 versions prior to 22.3R1-S2, 22.3R2;
• 22.4 versions prior to 22.4R1-S1, 22.4R2.

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-2023-28970.
 

The following software releases have been updated to resolve this specific issue: Junos OS 21.2R3-S4, 21.4R3-S3, 22.1R3-S1, 22.2R2-S2, 22.2R3, 22.3R1-S2, 22.3R2, 22.4R1-S1, 22.4R2, 23.1R1, and all subsequent releases.

This issue is being tracked as 1677503

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

• 2023-04-12: Initial Publication.

• 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-2023-28970 at cve.mitre.org