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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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