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AUSCERT External Security Bulletin Redistribution
ESB-2014.1207
Siemens OpenSSL Vulnerabilities
22 July 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: APE
CP1543-1
ROX 1
ROX 2
S7-1500
WinCC OA (PVSS)
Publisher: ICS-CERT
Operating System: Network Appliance
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-3470 CVE-2014-0224 CVE-2014-0198
CVE-2010-5298
Reference: ASB-2014.0079
ASB-2014.0077
ASB-2014.0076
ESB-2014.0887
ESB-2014.0755
ESB-2014.0751
ESB-2014.0624.2
ESB-2014.0543
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-14-198-03
Comment: ICS-CERT reports that exploits that target these OpenSSL
vulnerabilities are publicly available.
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Advisory (ICSA-14-198-03)
Siemens OpenSSL Vulnerabilities
Original release date: July 17, 2014 | Last revised: July 18, 2014
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 four vulnerabilities in its OpenSSL cryptographic
software library affecting several Siemens industrial products. Updates are
available for APE 2.0.2 and WinCC OA (PVSS). The ROX 1, ROX 2, S7-1500,
and CP1543-1 products do not have a patch at this time; however, Siemens
has made mitigation recommendations. Siemens is continuing to work on
patching these vulnerabilities.
These vulnerabilities could be exploited remotely. Exploits that target
OpenSSL vulnerabilities are publicly available.
AFFECTED PRODUCTS
The following Siemens products are affected:
APE versions prior to Version 2.0.2 (only affected if SSL/TLS component
or Crossbow is used),
CP1543-1: all versions,
ROX 1: all versions (only affected if Crossbow is installed),
ROX 2: all versions (only affected if eLAN or Crossbow is installed),
S7-1500: all versions, and
WinCC OA (PVSS): Version 3.8 - 3.12
IMPACT
The vulnerabilities identified could impact authenticity, integrity,
and availability of affected devices. The man-in-the-middle attack could
allow an attacker to hijack a session between an authorized user and the
device. The other vulnerabilities reported could impact the availability
of the device by causing the web server of the product to crash.
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. Siemens
develops products mainly in the energy, healthcare and public health sectors,
and transportation systems.
The affected Siemens industrial products are for process and network
control and monitoring in critical infrastructure sectors such as Chemical,
Critical Manufacturing, Energy, Food and Agriculture, and Water and
Wastewater Systems.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
MAN-IN-THE-MIDDLE[a]
An attacker could perform a man-in-the-middle (MitM) attack between a
vulnerable client and a vulnerable server. This vulnerability affects ROX,
APE, S7-1500, and CP1543-1.
CVE-2014-0224[b] has been assigned to this vulnerability. A CVSS
v2 base score of 6.8 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:P/I:P/A:P).[c]
IMPROPER INPUT VALIDATION[d]
Specially crafted packets may crash the web server of the product. This
vulnerability affects the SIMATIC S7-1500.
CVE-2014-0198[e] has been assigned to this vulnerability. A CVSS
v2 base score of 4.3 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:N/I:N/A:P).[f]
IMPROPER INPUT VALIDATION[g]
Specially crafted packets may crash the web server of the product. This
vulnerability affects the SIMATIC S7-1500.
CVE-2010-5298[h] has been assigned to this vulnerability. A CVSS
v2 base score of 4.0 has been assigned; the CVSS vector string is
(AV:N/AC:H/Au:N/C:N/I:P/A:P).[i]
IMPROPER INPUT VALIDATION[j]
Specially crafted packets may crash the web server of the product. This
vulnerability affects the WinCC OA (PVSS).
CVE-2014-3470[k] has been assigned to this vulnerability. A CVSS
v2 base score of 4.3 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:N/I:N/A:P).[l]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTANCE OF EXPLOIT
Exploits that target OpenSSL vulnerabilities are publicly available.
DIFFICULTY
An attacker with a moderate skill would be able to exploit these
vulnerabilities.
MITIGATION
Siemens provides updates for the following products:
APE 2.0.2 available at:
http://support.automation.siemens.com/WW/view/en/97654933
WinCC OA (PVSS) available at the Siemens ETM portal.
Siemens is preparing updates for the other affected products that will fix
these vulnerabilities. Siemens will provide information and update their
advisory (SSA-234763) when the new releases are available. In the meantime,
customers should mitigate the risk of their products by implementing the
following steps:
ROX 1: all versions (only affected if Crossbow is installed)
Use only in trusted networks.
ROX 2: all versions (only affected if eLAN or Crossbow is installed)
Follow the Application Note[m] if eLAN is installed on APE, or
Update Debian using the standard update procedures if eLAN is installed
on Linux system, or
Use only in trusted networks.
S7-1500: all versions
Disable the web server, or
Limit web server access to trusted networks only.
CP1543-1: all versions for FTPS and SMTP:
Disable or
Use the VPN functionality to tunnel FTPS/SMTP, or
Use only in trusted networks.
Siemens also recommends protecting network access to all products except
for perimeter devices such as CP1543-1 with appropriate mechanisms. It
is advised to follow recommended security practices and to configure the
environment according to operational guidelines[n] in order to run the
devices in a protected IT environment.
Siemens provides specific advice for mitigating risk in each of the
affected products in SSA-234763, which can be found at its web site at
the following location:
http://www.siemens.com/cert/advisories
ICS-CERT encourages asset owners to take additional defensive measures to
protect against this and other cybersecurity risks.
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 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. ICS-CERT reminds organizations to perform proper impact analysis
and risk assessment prior to deploying defensive measures.
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.
In addition, ICS-CERT recommends that users take the following measures
to protect themselves from social engineering attacks:
Do not click web links or open unsolicited attachments in email messages.
Refer to Recognizing and Avoiding Email Scams[o] for more information
on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks[p] for more
information on social engineering attacks.
a. CWE-310: Cryptographic Issues,
http://cwe.mitre.org/data/definitions/310.html, web site last accessed
July 17, 2014.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0224,
web site last accessed July 17, 2014.
c. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P,
web site last accessed July 17, 2014.
d. CWE-119: Improper Restriction of Operations within the Bounds
of a Memory Buffer, http://cwe.mitre.org/data/definitions/119.html,
web site last accessed July 17, 2014.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0198,
web site last accessed July 17, 2014.
f. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:N/A:P,
web site last accessed July 17, 2014.
g. CWE-362: Concurrent Execution using Shared
Resource with Improper Synchronization ('Race Condition'),
http://cwe.mitre.org/data/definitions/362.html, web site last accessed
July 17, 2014.
h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-5298,
web site last accessed July 17, 2014.
i. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:H/Au:N/C:N/I:P/A:P,
web site last accessed July 17, 2014.
j. CWE-476: NULL Pointer Dereference,
http://cwe.mitre.org/data/definitions/476.html, web site last accessed
July 17, 2014.
k. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3470,
web site last accessed July 17, 2014.
l. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:N/A:P,
web site last accessed July 17, 2014.
m. Siemens Application Notes,
http://w3.siemens.com/mcms/industrial-communication/en/rugged-communicat...,
web site last accessed July 17, 2014.
n. Operational Guidelines for Industrial Security,
http://www.industry.siemens.com/topics/global/en/industrial-security/Doc...,
web site last accessed July 17, 2014.
o. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed July 17, 2014.
p. National Cyber Alert System Cyber Security Tip ST04-014,
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed
July 17, 2014
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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