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2018-10 Security Bulletin: ScreenOS: Stored Cross-Site Scripting (XSS) vulnerability (CVE-2018-0059)

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Product Affected:
This issue affects ScreenOS 6.3.0.
Problem:

A persistent cross-site scripting vulnerability in the graphical user interface of ScreenOS may allow a remote authenticated user to inject web script or HTML and steal sensitive data and credentials from a web administration session, possibly tricking a follow-on administrative user to perform administrative actions on the device.

Affected releases are Juniper Networks ScreenOS 6.3.0 versions prior to 6.3.0r26.

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-2018-0059.
 

Solution:

The following software releases have been updated to resolve this specific issue: ScreenOS 6.3.0r26 and all subsequent releases.

Review and clear any previously stored cross-site scripting entries.

This issue is being tracked as PR 1323345 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).
 

Workaround:

Use access lists or firewall filters to limit access to the device only from trusted hosts and administrators.

In addition to the recommendations listed above, it is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device only from trusted, administrative networks or hosts.

Disable the web administrative interface if it is not necessary.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
‚Äč2018-10-10: Initial publication

Related Links:
CVSS Score:
5.4 (CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
Risk Level:
Medium
Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
Acknowledgements:
The Juniper SIRT would like to would like to acknowledge and thank Marcel Bilal from IT-Dienstleistungszentrum Berlin.