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AUSCERT External Security Bulletin Redistribution
ESB-2022.5664
Junos OS Evolved: The ssh CLI command always runs as root which can lead to
privilege escalation (CVE-2022-22239)
8 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS Evolved
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2022-22239
Original Bulletin:
https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-Evolved-The-ssh-CLI-command-always-runs-as-root-which-can-lead-to-privilege-escalation-CVE-2022-22239
Comment: CVSS (Max): 8.2 CVE-2022-22239 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
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Article ID: JSA69895
Product Affected: This issue affects all versions of Junos OS Evolved.
Severity Level: High
CVSS Score: 8.2 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H)
Problem:
An Execution with Unnecessary Privileges vulnerability in Management Daemon
(mgd) of Juniper Networks Junos OS Evolved allows a locally authenticated
attacker with low privileges to escalate their privileges on the device and
potentially remote systems.
This vulnerability allows a locally authenticated attacker with access to the
ssh operational command to escalate their privileges on the system to root, or
if there is user interaction on the local device to potentially escalate
privileges on a remote system to root.
This issue affects Juniper Networks Junos OS Evolved:
All versions prior to 20.4R3-S5-EVO;
21.1-EVO versions prior to 21.1R3-EVO;
21.2-EVO versions prior to 21.2R2-S1-EVO, 21.2R3-EVO;
21.3-EVO versions prior to 21.3R2-EVO.
This issue does not affect Juniper Networks Junos OS.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was found during internal product security testing or research.
This issue has been assigned CVE-2022-22239.
Solution:
The following software releases have been updated to resolve this specific
issue: 20.4R3-S5-EVO, 21.1R3-EVO, 21.2R2-S1-EVO, 21.2R3-EVO, 21.3R2-EVO,
21.4R1-EVO, and all subsequent releases.
This issue is being tracked as PR 1621892 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/.
Workaround:
A workaround for this issue is to modify the applicable login class(es) so that
the ssh command can not be accessed anymore. This can be done by removing the
'network' permission or modifying the resp. allow-/deny-commands configuration.
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
Modification History:
2022-10-12: Initial Publication.
Related Information:
KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
Report a Security Vulnerability - How to Contact the Juniper Networks
Security Incident Response Team
CVE-2022-22239 at cve.mitre.org
Last Updated: 2022-10-12
Created: 2022-10-12
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