Insufficient Cross-Site Scripting (XSS) protection in J-Web may potentially allow a remote attacker to inject web script or HTML, hijack the target user's J-Web session and perform administrative actions on the Junos device as the targeted user.

This issue affects Juniper Networks Junos OS

12.3 versions prior to 12.3R12-S15;

12.3X48 versions prior to 12.3X48-D86, 12.3X48-D90 on SRX Series;

14.1X53 versions prior to 14.1X53-D51 on EX and QFX Series;

15.1F6 versions prior to 15.1F6-S13;

15.1 versions prior to 15.1R7-S5;

15.1X49 versions prior to 15.1X49-D181, 15.1X49-D190 on SRX Series;

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

15.1X53 versions prior to 15.1X53-D592 on EX2300/EX3400 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 17.1R2-S11, 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-S6, 17.4R3;

18.1 versions prior to 18.1R3-S7;

18.2 versions prior to 18.2R2-S5, 18.2R3;

18.3 versions prior to 18.3R1-S6, 18.3R2-S1, 18.3R3;

18.4 versions prior to 18.4R1-S5, 18.4R2;

19.1 versions prior to 19.1R1-S2, 19.1R2.

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

The examples of the config stanza affected by this issue:

This issue was discovered during an external security research.

This issue has been assigned CVE-2020-1607 .

The following software releases have been updated to resolve this specific issue: 12.3R12-S15, 12.3X48-D86, 12.3X48-D90, 14.1X53-D51, 15.1F6-S13,15.1R7-S5, 15.1X49-D181, 15.1X49-D190, 15.1X53-D238, 15.1X53-D592, 16.1R4-S13, 16.1R7-S5, 16.2R2-S10,17.1R2-S11, 17.1R3-S1, 17.2R1-S9, 17.2R3-S2, 17.3R2-S5, 17.3R3-S5, 17.4R2-S6, 17.4R3, 18.1R3-S7,18.2R2-S5, 18.2R3, 18.3R1-S6, 18.3R2-S1, 18.3R3, 18.4R1-S5, 18.4R2, 19.1R1-S2, 19.1R2, 19.2R1, and all subsequent releases.

This issue is being tracked as 1434553 .

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

Access the J-Web service from trusted hosts which may not be compromised by cross-site scripting attacks, for example, deploying jump hosts with no internet access.

Alternatively, disable J-Web.

2020-01-08: Initial Publication.
2020-01-16: Adding reference to https://jvn.jp/en/jp/JVN21753370/

• 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-2020-1607 at cve.mitre.org
• JSA10986 Junos OS: Cross-Site Scripting (XSS) in J-Web [juniper.net]
• JVN#21753370

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