Product Affected

This issue affects Junos OS Evolved 21.3-EVO, 21.4-EVO, 22.1-EVO, 22.2-EVO, 22.3-EVO, 22.4-EVO.
Medium
5.4 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L)

Problem

An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in the NetworkStack agent daemon (nsagentd) of Juniper Networks Junos OS Evolved allows an unauthenticated network based attacker to cause limited impact to the availability of the system.
 

If specific packets reach the Routing-Engine (RE) these will be processed normally even if firewall filters are in place which should have prevented this. This can lead to a limited, increased consumption of resources resulting in a Denial-of-Service (DoS), and unauthorized access.


CVE-2023-44196 is a prerequisite for this issue.


This issue affects Juniper Networks Junos OS Evolved:

  • 21.3-EVO versions prior to 21.3R3-S5-EVO;
  • 21.4-EVO versions prior to 21.4R3-S4-EVO;
  • 22.1-EVO version 22.1R1-EVO and later;
  • 22.2-EVO version 22.2R1-EVO and later;
  • 22.3-EVO versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO;
  • 22.4-EVO versions prior to 22.4R3-EVO.


This issue doesn't not affected Junos OS Evolved versions prior to 21.3R1-EVO.


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-2023-44195.

Solution

The following software releases have been updated to resolve this specific issue: 21.3R3-S5-EVO, 21.4R3-S4-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R1-EVO, and all subsequent releases.


This issue is being tracked as PR 1713989 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).

Workaround

There are no known workarounds for this issue.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History

2023-10-11: Initial Publication

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