A persistent Cross-Site Scripting (XSS) vulnerability in Junos OS J-Web interface may allow remote unauthenticated attackers to perform administrative actions on the Junos device. Successful exploitation requires a Junos administrator to first perform certain diagnostic actions on J-Web.

This issue affects:

Juniper Networks Junos OS 12.1X46 versions prior to 12.1X46-D86;

12.3 versions prior to 12.3R12-S13;

12.3X48 versions prior to 12.3X48-D80;

14.1X53 versions prior to 14.1X53-D51;

15.1 versions prior to 15.1F6-S13, 15.1R7-S4;

15.1X49 versions prior to 15.1X49-D171, 15.1X49-D180;

15.1X53 versions prior to 15.1X53-D497, 15.1X53-D69;

16.1 versions prior to 16.1R7-S5;

16.2 versions prior to 16.2R2-S9;

17.1 versions prior to 17.1R3;

17.2 versions prior to 17.2R1-S8, 17.2R2-S7, 17.2R3-S1;

17.3 versions prior to 17.3R3-S6;

17.4 versions prior to 17.4R1-S7, 17.4R2-S4, 17.4R3;

18.1 versions prior to 18.1R3-S5;

18.2 versions prior to 18.2R1-S5, 18.2R2-S3, 18.2R3;

18.3 versions prior to 18.3R1-S3, 18.3R2, 18.3R3;

18.4 versions prior to 18.4R1-S2, 18.4R2.

Successful exploitation require 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-2019-0047 .

The following software releases have been updated to resolve this specific issue: 12.1X46-D86, 12.3R12-S13, 12.3X48-D80, 14.1X53-D51, 15.1F6-S13, 15.1R7-S4, 15.1X49-D171, 15.1X49-D180, 15.1X53-D497, 15.1X53-D69, 16.1R7-S5, 16.2R2-S9, 17.1R3, 17.2R1-S8, 17.2R2-S7, 17.2R3-S1, 17.3R3-S6, 17.4R1-S7, 17.4R2-S4, 17.4R3, 18.1R3-S5, 18.2R1-S5, 18.2R2-S3, 18.2R3, 18.3R1-S3, 18.3R2, 18.4R1-S2, 18.4R2, 19.1R1, and all subsequent releases.

This issue is being tracked as PR  1410400  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).

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

Disable J-Web.

Limit access to the Junos device to only trusted hosts and networks.

• 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-2019-0047 at cve.mitre.org

The Juniper SIRT would like to would like to acknowledge and thank Farid Heydari for finding and reporting this issue.