Product Affected

This issue can affect any product or platform running Junos OS with J-Web enabled.
High
8.0 (CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H)

Problem

Insufficient cross site scripting protection in J-Web may potentially allow a remote unauthenticated user to inject web script or HTML and steal sensitive data and credentials from a J-Web session and to perform administrative actions on the Junos device.

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

This issue has been assigned CVE-2016-4923 .

Solution

The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D60, 12.1X46-D40, 12.1X47-D30, 12.3R11, 12.3X48-D20, 13.2X51-D39, 13.2X51-D40, 13.3R9, 14.1R6, 14.2R6, 15.1R3, 15.1X49-D20 and 16.1R1 and all subsequent releases.

This issue is being tracked as PR 1085816 and is visible on the Customer Support website.

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.

Workaround

Access J-Web from trusted hosts which may not be compromised by cross-site scripting attacks, for example, deploying jump hosts with no internet access which use anti-scripting techniques to mitigate potential threats.

Modification History

Modification History:

2016-10-12: Initial publication

Related Information

Acknowledgements