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AUSCERT External Security Bulletin Redistribution
ESB-2017.1648
Advisory (ICSA-17-180-03) Siemens Viewport for Web Office Portal
30 June 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Viewport for Web Office Portal
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Root Compromise -- Remote/Unauthenticated
Create Arbitrary Files -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2017-6869
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-17-180-03
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Advisory (ICSA-17-180-03)
Siemens Viewport for Web Office Portal
Original release date: June 29, 2017
Legal Notice
All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For
more information about TLP, see http://www.us-cert.gov/tlp/.
CVSS v3 9.8
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: Viewport for Web Office Portal
Vulnerability: Improper Authentication
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following ViewPort for Web
Office Portal products:
ViewPort for Web Office Portal: versions prior to revision number 1453
IMPACT
Successful exploitation of this vulnerability could allow a remote attacker to
upload and execute arbitrary code.
MITIGATION
Siemens has released software revision number 1453 for ViewPort for Web Office
Portal to address the vulnerability. It is recommended that users update to
the fixed version. This new version can be obtained by emailing Siemens Energy
Customer Support Center at: support.energy@siemens.com (link sends e-mail)
Siemens recommends the following mitigations until patches can be applied:
Protect access to Port 443/TCP and Port 80/TCP of the affected product with
appropriate measures.
Disable Port 80/TCP and use TLS client certificates (PKI) to access Port
443/TCP.
Apply Defense-in-Depth.
https://www.siemens.com/gridsecurity (link is external)
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-545214 at the following
location:
http://www.siemens.com/cert/advisories (link is external)
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:
Minimize network exposure for all control system devices and/or systems, and
ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize that VPN is only
as secure as the connected devices.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly
available in the ICSCERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
VULNERABILITY OVERVIEW
IMPROPER AUTHENTICATION CWE-287
An unauthenticated remote attacker may be able to use specially crafted
network packets to upload arbitrary code to Port 443/TCP or Port 80/TCP and
execute with the permissions of the operating system user.
CVE-2017-6869 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
RESEARCHER
Hannes Trunde from Kapsch BusinessCom AG reported this vulnerability to
Siemens.
BACKGROUND
Critical Infrastructure Sector(s): Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
ICS-CERT continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this
product.
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