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AUSCERT External Security Bulletin Redistribution
ESB-2016.1281
Siemens SIPROTEC Information Disclosure Vulnerabilities
20 May 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SIPROTEC
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4785 CVE-2016-4784
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-140-02
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Advisory (ICSA-16-140-02)
Siemens SIPROTEC Information Disclosure Vulnerabilities
Original release date: May 19, 2016
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/.
OVERVIEW
Siemens has identified information disclosure vulnerabilities in SIPROTEC 4
and SIPROTEC Compact. These vulnerabilities were reported directly to Siemens
by Aleksandr Bersenev from HackerDom team and Pavel Toporkov from Kaspersky
Lab. Siemens has produced a firmware update to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following products:
EN100 Ethernet module included in SIPROTEC 4 and SIPROTEC Compact: EN100
version V4.26 or lower, and
Ethernet Service Interface on Port A of SIPROTEC Compact models 7SJ80, 7SK80,
7SD80, 7RW80, 7SJ81, 7SK81: All firmware versions.
IMPACT
Exploits of these vulnerabilities could allow an attacker with network access
to obtain sensitive device information.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.
BACKGROUND
Siemens is a multinational company headquartered in Munich, Germany.
The affected products, SIPROTEC 4 and SIPROTEC Compact devices, provide a wide
range of integrated protection, control, measurement, and automation functions
for electrical substations and other fields of application. The EN100 module
is used for enabling IEC 61850 communications with electrical/optical 100 Mbit
interface for SIPROTEC 4 and SIPROTEC Compact devices. According to Siemens,
SIPROTEC devices are deployed across several sectors including Energy. Siemens
estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
INFORMATION EXPOSURE[a]
The integrated web server (Port 80/TCP) of the affected devices could allow
remote attackers to obtain sensitive device information if network access was
obtained.
CVE-2016-4784[b] 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).[c]
INFORMATION EXPOSURE[d]
The integrated web server (Port 80/TCP) of the affected devices could allow
remote attackers to obtain a limited amount of device memory content if
network access was obtained. This vulnerability only affects EN100 Ethernet
module included in SIPROTEC 4 and SIPROTEC Compact devices.
CVE-2016-4785[e] 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).[f]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with a low skill and network access would be able to exploit these
vulnerabilities.
MITIGATION
Siemens provides firmware update V4.27 for EN100 module included in SIPROTEC 4
and SIPROTEC Compact to fix the vulnerability. The firmware updates can be
found at the following locations on the Siemens web site:
http://www.siemens.com/downloads/siprotec-4 (link is external)
http://www.siemens.com/downloads/siprotec-compact (link is external)
An attacker must have network access to the affected devices. For remaining
affected products, Siemens recommends to protect network access with
appropriate mechanisms (e.g., firewalls, segmentation, VPN). It is advised to
configure the environment according to Siemens operational guidelines in order
to run the devices in a protected IT environment. Siemens provides guidance at
the following location for operating the devices only within trusted networks:
http://www.siemens.com/gridsecurity (link is external)
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-547990 at the following
location:
http://www.siemens.com/cert/advisories (link is external)
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 at:
http://ics-cert.us-cert.gov/content/recommended-practices. 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
(http://ics-cert.us-cert.gov/).
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.
a. CWE-200: Information Exposure,
http://cwe.mitre.org/data/definitions/200.html, web site last accessed May 19,
2016.
b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4784, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
c. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed May 19, 2016.
d. CWE-200: Information Exposure,
http://cwe.mitre.org/data/definitions/200.html, web site last accessed May 19,
2016.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4785, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
f. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed May 19, 2016.
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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The University of Queensland
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