An Allocation of Resources Without Limits or Throttling and a Missing Release of Memory after Effective Lifetime vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a locally authenticated low privileged attacker to cause a Denial of Sevice (DoS).

In a high-scaled BGP routing environment with rib-sharding enabled, two issues may occur when executing a specific CLI command. One is a memory leak issue with rpd where the leak rate is not constant, and the other is a temporary spike in rpd memory usage during command execution.

This issue affects:

Juniper Networks Junos OS

• 19.4 versions prior to 19.4R3-S9;
• 20.2 versions prior to 20.2R3-S5;
• 20.3 versions prior to 20.3R3-S2;
• 20.4 versions prior to 20.4R3-S1;
• 21.1 versions prior to 21.1R3;
• 21.2 versions prior to 21.2R1-S2, 21.2R2-S1, 21.2R3;
• 21.3 versions prior to 21.3R2.

Juniper Networks Junos OS Evolved

• All versions prior to 20.4R3-S1-EVO;
• 21.1-EVO version 21.1R1-EVO and later versions;
• 21.2-EVO versions prior to 21.2R1-S2-EVO, 21.2R3-EVO;
• 21.3-EVO versions prior to 21.3R2-EVO.

This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1.

To be exposed to this vulnerability a device needs to be configured with BGP rib sharding as follows:

[system processes routing bgp rib-sharding]

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-2022-22240.

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

Junos OS:19.4R3-S9, 20.2R3-S5, 20.3R3-S2, 20.4R3-S1, 21.1R3, 21.2R1-S2, 21.2R2-S1, 21.2R3, 21.3R2, 21.4R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S1-EVO, 21.2R1-S2-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1615162 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/.

There are no known workarounds for this issue.

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks, hosts and users.

• 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-2022-22240 at cve.mitre.org