Product Affected

This issue affects Junos OS Evolved 21.2-EVO, 21.4-EVO, 22.2-EVO, 22.3-EVO, 22.4-EVO, 23.2-EVO, 23.4-EVO.
Medium

CVSS: v3.1: 6.7 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
CVSS: v4.0: 8.4 (CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/AU:Y/R:U/V:C/RE:L/U:Green)

Problem

An Authorization Bypass Through User-Controlled Key vulnerability allows a locally authenticated attacker with shell access to gain full control of the device when Dual Routing Engines (REs) are in use on Juniper Networks Junos OS Evolved devices.

This issue affects:
Juniper Networks Junos OS Evolved with dual-REs:

  • All versions before 21.2R3-S8-EVO,
  • from 21.4-EVO before 21.4R3-S8-EVO,
  • from 22.2-EVO before 22.2R3-S4-EVO,
  • from 22.3-EVO before 22.3R3-S4-EVO,
  • from 22.4-EVO before 22.4R3-S3-EVO,
  • from 23.2-EVO before 23.2R2-S1-EVO,
  • from 23.4-EVO before 23.4R2-S1-EVO.
This issue does not affect Juniper Networks Junos OS.

Required configuration for exposure:

To determine if the system is running a dual routing engine verify if the redundancy configuration and the status of routing engines is in use, issue the following command:
  show chassis routing-engine

Solution

The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 21.2R3-S8-EVO, 21.4R3-S8-EVO, 22.2R3-S4-EVO, 22.3R3-S4-EVO, 22.4R3-S3-EVO, 23.2R2-S1-EVO, 23.4R2-S1-EVO, 24.2R1-EVO and all subsequent releases.

This issue is being tracked as 1790662 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.

To reduce the risk of exploitation, limit access to the device only from trusted administrative networks, users and hosts.

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

2024-10-09: Initial Publication

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