2020-04 Security Bulletin: Junos OS Evolved: Local log files accessible from the shell may leak sensitive information

Product Affected:

This issue affects Junos OS Evolved.

Problem:

Multiple information disclosure vulnerabilities in Juniper Networks Junos OS Evolved allow a local, authenticated user with shell access the ability to view sensitive configuration information, such as the hashed values of login passwords and shared secrets. The information provided is similar to the output from 'show config system login', which is typically restricted to the super-user class. The log files are readable by any authenticated user with shell access.

One or more of these issues affect all versions of Junos OS Evolved prior to 19.3R1.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing or research.

The issues addressed in this advisory include:

CVE	CVSS	Summary
CVE-2020-1620	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)	A local, authenticated user with shell can obtain the hashed values of login passwords via configd streamer log.
CVE-2020-1621	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)	A local, authenticated user with shell can obtain the hashed values of login passwords via configd traces.
CVE-2020-1622	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)	A local, authenticated user with shell can obtain the hashed values of login passwords and shared secrets via the EvoSharedObjStore.
CVE-2020-1623	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)	A local, authenticated user with shell can view sensitive configuration information via the ev.ops configuration file.
CVE-2020-1624	5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)	A local, authenticated user with shell can obtain the hashed values of login passwords and shared secrets via raw objmon configuration files.

Solution:

The following software releases have been updated to resolve these specific issues: 19.3R1-EVO and all subsequent releases.

This issue is being tracked as 1406193, 1406189, 1406195, 1406191 and 1406239.

Workaround:

Disallow unprivileged authenticated users access to Junos shell.
Limit access to the Junos OS shell to only trusted system administrators.

Implementation:

How to obtain fixed software:

Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of "PRs fixed" can be provided on request.

Modification History:

2020-04-08: Initial publication

CVSS Score:

5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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."

Knowledge Base