Junos OS: Access Confidential Data -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.4240
  JSA11066 - 2020-10 Security Bulletin: Junos OS: NFX350: Password hashes
              stored in world-readable format (CVE-2020-1669)
                              1 December 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-1669  

Original Bulletin: 
   http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11066

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2020-10 Security Bulletin: Junos OS: NFX350: Password hashes stored in world-readable format (CVE-2020-1669)

Article ID  : JSA11066
Last Updated: 30 Nov 2020
Version     : 2.0

Product Affected:
This issue affects Junos OS 19.4, 20.1. Affected platforms: NFX350.
Problem:

The Juniper Device Manager (JDM) container, used by the disaggregated Junos OS
architecture on Juniper Networks NFX350 Series devices, stores password hashes
in the world-readable file /etc/passwd. This is not a security best current
practice as it can allow an attacker with access to the local filesystem the
ability to brute-force decrypt password hashes stored on the system.

This issue affects Juniper Networks Junos OS on NFX350:

  o 19.4 versions prior to 19.4R3;
  o 20.1 versions prior to 20.1R1-S4, 20.1R2.

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-2020-1669 .

Solution:

Junos OS now stores local password hashes in the protected /etc/shadow file.

The following software releases have been updated to resolve this specific
issue: Junos OS 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1, and all subsequent releases.

This issue is being tracked as 1462556 .

Workaround:

Use access lists or firewall filters to limit access to the device only from
trusted hosts.

Limit shell access to only trusted system administrators.

Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:

2020-10-14: Initial Publication

CVSS Score:
6.3 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
Severity Level:
Medium
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."

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