A Use of Uninitialized Resource vulnerability in the Border Gateway Protocol (BGP) software of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker to send specific genuine BGP packets to a device configured with BGP to cause a Denial of Service (DoS) by crashing the Routing Protocol Daemon (rpd). This issue is triggered when the packets attempt to initiate a BGP connection before a BGP session is successfully established.

Continued receipt of these specific BGP packets will cause a sustained Denial of Service condition.

This issue is triggerable in both iBGP and eBGP deployments.

This issue affects:

Juniper Networks Junos OS

• 21.1 version 21.1R1 and later versions prior to 21.1R3-S5;
• 21.2 version 21.2R1 and later versions prior to 21.2R3-S2;
• 21.3 version 21.3R1 and later versions prior to 21.3R3-S2;
• 21.4 versions prior to 21.4R3;
• 22.1 versions prior to 22.1R3;
• 22.2 versions prior to 22.2R2.

This issue does not affect Juniper Networks Junos OS versions prior to 21.1R1.

This issue affects:

Juniper Networks Junos OS Evolved

• 21.1-EVO version 21.1R1-EVO and later versions prior to 21.4R3-EVO;
• 22.1-EVO versions prior to 22.1R3-EVO;
• 22.2-EVO versions prior to 22.2R2-EVO.

This issue does not affect Juniper Networks Junos OS Evolved versions prior to 21.1R1-EVO.

The following minimal configuration is required:

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-2023-28967.

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

Junos OS: 21.1R3-S5, 21.2R3-S2, 21.3R3-S2, 21.4R3, 22.1R3, 22.2R2, 22.3R1, and all subsequent releases.

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

This issue is being tracked as 1673833

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

There are no known workarounds for this issue.

To reduce the risk of exploitation utilize common security BCPs to limit the exploitable surface by disallowing access to all BGP services on networks and devices to only trusted systems, administrators, networks and hosts.

• 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-2023-28967 at cve.org