ESB-2017.1744 - [Juniper] Juniper ScreenOS: Cross-site scripting - Remote with user interaction 2017-07-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1744
             2017-07 Security Bulletin: ScreenOS: Multiple XSS
                   vulnerabilities in ScreenOS Firewall
                               13 July 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Juniper ScreenOS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-2339 CVE-2017-2338 CVE-2017-2337
                   CVE-2017-2336 CVE-2017-2335 

Original Bulletin: 
   https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10782

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2017-07 Security Bulletin: ScreenOS: Multiple XSS vulnerabilities in ScreenOS
Firewall

PRODUCT AFFECTED:

These issues affect all versions of ScreenOS prior to the fixed release listed
below.

PROBLEM:

A security researcher testing a Juniper NetScreen Firewall+VPN found multiple
stored cross-site scripting vulnerabilities that could be used to elevate 
privileges through the NetScreen WebUI. A user with the 'security' role can 
inject HTML/JavaScript content into the management session of other users 
including the administrator. This enables the lower-privileged user to 
effectively execute commands with the permissions of an administrator.

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

No other Juniper Networks products or platforms are affected by this issue.

These issues have been assigned CVE-2017-2335, CVE-2017-2336, CVE-2017-2337, 
CVE-2017-2338, CVE-2017-2339, and collectively, JPCERT/CC JVN#74247807.

SOLUTION:

ScreenOS has been updated to add checks to prevent scripts in WebUI strings.

The following software release has been updated to resolve this specific 
issue: ScreenOS 6.3.0r24, and all subsequent releases.

This issue is being tracked as PR 1136628 and is visible on the Customer 
Support website.

KB16765 - "In which releases are vulnerabilities fixed?" describes which 
release vulnerabilities are fixed as per our End of Engineering and End of 
Life support policies.

WORKAROUND:

Use access lists or firewall filters to limit access to the firewall's WebUI 
only from trusted hosts.

IMPLEMENTATION:

Software releases are available from the "Download Software" link on the 
Juniper Networks Customer Support website.

MODIFICATION HISTORY:

2017-07-12: Initial publication

RELATED LINKS:

KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin 
Publication Process

KB16765: In which releases are vulnerabilities fixed?

KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security 
Advisories

Report a Vulnerability - How to Contact the Juniper Networks Security Incident
Response Team

CVSS SCORE:

8.4 (CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H)

RISK LEVEL:

High

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:

Juniper SIRT would like to thank Gaku Mochizuki/Toshitsugu Yoneyama from 
Mitsui Bussan Secure Directions, Inc., for reporting this issue to the 
JPCERT/CC.

Juniper SIRT would also like to acknowledge and thank Craig Young, Principal 
Security Researcher, Tripwire VERT, for responsibly reporting this 
vulnerability.

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