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

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Article ID: JSA10782 SECURITY_ADVISORIES Last Updated: 17 Nov 2017Version: 3.0
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-2017-2335CVE-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

CVSS Score:
8.4 (CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H)
Severity Level:
High
Severity 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.

Juniper SIRT would additionally like to acknowledge and thank Marcel Bilal from IT-Dienstleistungszentrum Berlin, for reporting additional XSS vulnerabilities in ScreenOS.
 

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