A path traversal vulnerability in the Juniper Networks Junos OS device may allow an authenticated J-web user to read files with 'world' readable permission and delete files with 'world' writeable permission.

This issue does not affect system files that can be accessed only by root user.

This issue affects Juniper Networks Junos OS:

12.3 versions prior to 12.3R12-S13;

12.3X48 versions prior to 12.3X48-D85 on SRX Series;

14.1X53 versions prior to 14.1X53-D51;

15.1F6 versions prior to 15.1F6-S13;

15.1 versions prior to 15.1R7-S5;

15.1X49 versions prior to 15.1X49-D180 on SRX Series;

15.1X53 versions prior to 15.1X53-D238 on QFX5200/QFX5110 Series;

16.1 versions prior to 16.1R4-S13, 16.1R7-S5;

16.2 versions prior to 16.2R2-S10;

17.1 versions prior to 17.1R3-S1;

17.2 versions prior to 17.2R1-S9, 17.2R3-S2;

17.3 versions prior to 17.3R2-S5, 17.3R3-S5;

17.4 versions prior to 17.4R2-S9, 17.4R3;

18.1 versions prior to 18.1R3-S8;

18.2 versions prior to 18.2R3;

18.3 versions prior to 18.3R2-S3, 18.3R3;

18.4 versions prior to 18.4R2;

19.1 versions prior to 19.1R1-S4, 19.1R2.

This issue requires J-Web to be enabled on the device.

The examples of the config stanza affected by this issue:

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

This issue was discovered during an external security research.

This issue has been assigned CVE-2020-1606 .

The following software releases have been updated to resolve this specific issue: 12.3R12-S13, 12.3X48-D85, 14.1X53-D51, 15.1F6-S13, 15.1R7-S5, 15.1X49-D180, 15.1X53-D238, 16.1R4-S13, 16.1R7-S5, 16.2R2-S10, 17.1R3-S1, 17.2R1-S9, 17.2R3-S2, 17.3R2-S5, 17.3R3-S5, 17.4R2-S9, 17.4R3, 18.1R3-S8, 18.2R3, 18.3R2-S3, 18.3R3, 18.4R2, 19.1R1-S4, 19.1R2, 19.2R1, and all subsequent releases.

This issue is being tracked as 1431298 .

Software Releases, patches and updates are available at  https://www.juniper.net/support/downloads/ .

Limit access to the J-Web interface to only trusted users to reduce risks of exploitation of this vulnerability.

2020-01-08: Initial Publication.
2020-01-16: Adding reference to https://jvn.jp/en/jp/JVN07375820/

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2020-1606 at cve.mitre.org
• JSA10985 Junos OS: Path traversal vulnerability in J-Web (CVE-2020-1606) [juniper.net]
• JVN#07375820

The Juniper SIRT would like to acknowledge and thank Toshitsugu Yoneyama of Mitsui Bussan Secure Directions, Inc. for finding and reporting this issue.