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AUSCERT External Security Bulletin Redistribution
ESB-2017.1587
Siemens SIMATIC CP 44x-1 Redundant Network Access Modules
23 June 2017
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AusCERT Security Bulletin Summary
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Product: SIMATIC CP 44x-1 Redundant Network Access (RNA) modules
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6868
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-173-01
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Advisory (ICSA-17-173-01)
Siemens SIMATIC CP 44x-1 Redundant Network Access Modules
Original release date: June 22, 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: SIMATIC CP 44x-1 Redundant Network Access (RNA) modules
Vulnerability: Improper Authentication
AFFECTED PRODUCTS
The following versions of the SIMATIC CP 44x-1 RNA, which connect SIMATIC
S7-400 CPUs to Industrial Ethernet, are affected:
SIMATIC CP 44x-1 RNA, all versions prior to Versions 1.4.1.
IMPACT
Successful exploitation of this vulnerability may allow an unauthenticated
remote attacker to perform administrative actions under certain conditions.
MITIGATION
Siemens has released firmware update, Version 1.4.1, for the SIMATIC CP
44x-1 RNA modules that fixes the vulnerability and is available at the
following location:
https://support.industry.siemens.com/cs/ww/en/view/109748227.
Siemens recommends that users apply the firmware update.
Siemens recommends that users apply the following mitigations until the
firmware update can be applied:
Apply cell protection concept, described in the following:
https://www.siemens.com/cert/operational-guidelines-industrial-security
Use VPN for protecting network communication between cells
Apply Defense-in-Depth, which is described in the following:
https://www.siemens.com/industrialsecurity
NCCIC/ICS-CERT recommends that users take defensive measures to minimize
the risk of exploitation of this vulnerability. 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 ICS-CERT 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 perform administrative
actions on the Communication Process (CP) of the RNA series module, if
network access to Port 102/TCP is available and the configuration file
for the CP is stored on the RNA's CPU.
CVE-2017-6868 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
Siemens reported this vulnerability.
BACKGROUND
Critical Infrastructure Sector(s): Chemical, Critical Manufacturing,
and Food and Agriculture
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Munich, Germany
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
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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