A Use After Free vulnerability in the Routing Protocol Daemon (rdp) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker to cause Denial of Service (DoS).

When a BGP session flap happens, a Use After Free of a memory location that was assigned to another object can occur, which will lead to an rpd crash. This is a race condition that is outside of the attacker's control and cannot be deterministically exploited. Continued flapping of BGP sessions can create a sustained Denial of Service (DoS) condition.

This issue affects Juniper Networks Junos OS:

• All versions prior to 18.4R2-S9, 18.4R3-S11;
• 19.1 versions prior to 19.1R3-S8;
• 19.2 version 19.2R1 and later versions;
• 19.3 versions prior to 19.3R3-S5;
• 19.4 versions prior to 19.4R2-S6, 19.4R3-S6;
• 20.1 version 20.1R1 and later versions;
• 20.2 versions prior to 20.2R3-S3;
• 20.3 versions prior to 20.3R3-S2;
• 20.4 versions prior to 20.4R3-S1;
• 21.1 versions prior to 21.1R3-S3;
• 21.2 versions prior to 21.2R2-S1, 21.2R3.

Juniper Networks Junos OS Evolved:

• All versions prior to 20.4R3-S4-EVO;
• 21.1-EVO versions prior to 21.1R3-S2-EVO;
• 21.2-EVO versions prior to 21.2R3-EVO;
• 21.3-EVO versions prior to 21.3R2-EVO.

To be vulnerable to this issue a device needs to be configured with a minimal BGP configuration for a session to be established as shown in the following example:

[protocols bgp group <group-name> neighbor <neighbor IP>]

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-2022-22208.

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

Junos OS: 18.4R2-S9, 18.4R3-S11, 19.1R3-S8, 19.3R3-S5, 19.4R2-S6, 19.4R3-S6, 20.2R3-S3, 20.3R3-S2, 20.4R3-S1, 21.1R3-S3, 21.2R2-S1, 21.2R3, 21.3R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S4-EVO, 21.1R3-S2-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1600812 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-2022-22208 at cve.mitre.org