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AUSCERT External Security Bulletin Redistribution
ESB-2017.2954
Multiple vulnerabilities have been identified in Siemens
SICAM RTUs Siemens SICAM
17 November 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SICAM RTU
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-12739 CVE-2017-12738 CVE-2017-12737
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-320-02
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Advisory (ICSA-17-320-02)
Siemens SICAM
Original release date: November 16, 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. Public exploits
are available.
Vendor: Siemens
Equipment: SICAM
Vulnerabilities: Missing Authentication for Critical Function, Cross-site
Scripting, Code Injection
AFFECTED PRODUCTS
Siemens reports that the vulnerabilities affect the following SICAM products:
SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00,
ETA2, ETLS00, MODi00, DNPi00: All versions.
IMPACT
Successful exploitation of these vulnerabilities could allow an
unauthenticated remote attacker to execute arbitrary code.
MITIGATION
As the web server is for diagnostics only and not required for normal
operation, Siemens recommends disabling the web server after commissioning.
For users who are currently using the discontinued ETA2 (IEC 60870-5-104),
MODi00 (Modbus/TCP slave) or DNPi00 (DNP3/TCP slave) firmware, Siemens
recommends users upgrade to ETA4 (IEC 60870-5-104), MBSiA0 (Modbus/TCP slave)
or DNPiA1 (DNP3/ TCP slave) firmware, respectively, on the SM-2558 COM Module,
which is the successor to the SM-2556 Module. The upgrades are available at:
http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/substation-automation/substation-automation/Pages/sicam-ak-3.aspx
(link is external)
Siemens recommends users protect network access with appropriate mechanisms.
Siemens also advises that users configure the operational environment
according to Siemens Operational Guidelines for Industrial Security:
https://www.siemens.com/cert/operational-guidelines-industrial-security (link
is external)
For more information on these vulnerabilities and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-164516 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 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.
VULNERABILITY OVERVIEW
MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
The integrated web server (Port 80/TCP) of the affected devices could allow
unauthenticated remote attackers to obtain sensitive device information over
the network.
CVE-2017-12737 has been assigned to this vulnerability. A CVSS v3 base score
of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The integrated web server (Port 80/TCP) of the affected devices could allow
cross-site scripting (XSS) attacks if unsuspecting users are tricked into
clicking on a malicious link.
CVE-2017-12738 has been assigned to this vulnerability. A CVSS v3 base score
of 6.1 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
IMPROPER CONTROL OF GENERATION OF CODE ('CODE INJECTION') CWE-94
The integrated web server (Port 80/TCP) of the affected devices could allow
unauthenticated remote attackers to execute arbitrary code on the affected
device.
CVE-2017-12739 has been assigned to this vulnerability. A CVSS v3 base score
of 9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
RESEARCHER
SEC Consult Vulnerability Lab reported these vulnerabilities directly to
Siemens.
BACKGROUND
Critical Infrastructure Sectors: 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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