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AUSCERT External Security Bulletin Redistribution
ESB-2014.0266
Schneider Electric OFS Buffer Overflow Vulnerability &
Schneider Electric Floating License Manager Vulnerability
3 March 2014
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric OFS
Schneider Electric Floating License Manager
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-0774 CVE-2014-0759
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-14-058-01
http://ics-cert.us-cert.gov/advisories/ICSA-14-058-02
Comment: This bulletin contains two (2) ICS-CERT security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Advisory (ICSA-14-058-02)
Schneider Electric OFS Buffer Overflow Vulnerability
Original release date: February 27, 2014
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
Schneider Electric has reported to NCCIC/ICS-CERT a Stack Buffer Overflow
vulnerability supplied with the Schneider Electric OPC Factory Server (OSF).
AFFECTED PRODUCTS
The following Schneider Electric OFS Test Client versions are affected:
- - TLXCDSUOFS33 - V3.35,
- - TLXCDSTOFS33 – V3.35,
- - TLXCDLUOFS33 – V3.35,
- - TLXCDLTOFS33 – V3.35, and
- - TLXCDLFOFS33 – V3.35
IMPACT
The parsing of the sample configuration file exposes a buffer overflow
vulnerability that may lead to remote code execution. This client was supplied
for demonstration purposes only and is not recommended for use in a production
environment.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of this vulnerability based on their operational environment, architecture,
and product implementation.
BACKGROUND
Schneider Electric is a European-based company that maintains offices in 190
countries worldwide.
These products are industrial active energy management control products,
deployed across several sectors including the Energy, Water and Wastewater
Systems, Commercial Facilties, Government Facilities, Food and Agriculture,
and Transportation Systems. Schneider Electric estimates that these products
are used primarily in the United States and North America.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
STACK BUFFER OVERFLOW [a]
When a malformed configuration file is parsed by the demonstration client, it
may cause a buffer overflow allowing the configuration file to start malicious
programs or execute code on the PC.
Schneider Electric provided a demonstration client with the OFS program for
training purposes and did not intend for use in a production environment.
CVE-2014-0774 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 6.8 has been assigned; the CVSS vector string is
(AV:L/AC:L/Au:S/C:C/I:C/A:C) [c].
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability is not exploitable remotely and cannot be exploited without
user interaction with the demonstration client. The exploit is only triggered
when the demonstration client opens a specially modified sample client
configuration file to execute malicious programs or execute code on the PC.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a moderate skill and physical access would be able to exploit
this vulnerability.
MITIGATION
Schneider Electric has a product upgrade as well as a workaround solution [d]
that mitigates this vulnerability.
The security announcements affecting the OPC Factory Server are available here:
http://www2.schneider-electric.com/sites/corporate/en/support/cybersecurity/cybersecurity.page
Schneider Electric recommends customers to upgrade to OFS v3.4 or later (
Version v3.5 is currently available). Customers that cannot upgrade are
directed to remove the demonstration client from affected computers, provided
it is not required for operations.
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 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 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-121: Stack Buffer Overflow, http://cwe.mitre.org/data/definitions/121.html, ,
web site last accessed February 27, 2014.
[b]. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0774, 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, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:L/AC:L/Au:S/C:C/I:C/A:C,
web site last visited February 27, 2014.
[d]. Schneider Electric Security Notification SEVD 2014-031-01,â€ÂVulnerability
Disclosure – OPC Factory Server V3.35,†http://www.downloads.schneider-electric.com/?p_Conf=&p_localesFilter=&p_... ,
web site last accessed February 27, 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.
- -----------------------------------------------------------------------------
Advisory (ICSA-14-058-01)
Schneider Electric Floating License Manager Vulnerability
Original release date: February 27, 2014
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
Schneider Electric had become aware of an "unquoted service path" vulnerability
in the Schneider Electric Floating License Manager, produced a patch [a] that
mitigates this vulnerability, and notified NCCIC/ICS-CERT.
AFFECTED PRODUCTS
The following Schneider Electric Floating License Manager versions are affected:
- - Schneider Electric Floating License Manager Versions V1.0.0 through V1.4.0
This license manager is used in five Schneider Electric Products.
IMPACT
The unquoted service path vulnerability affects one of the services installed
by the Floating License Manager. This vulnerability could allow attackers to
start malicious programs as Windows services.
This license manager is used in the following Schneider Electric products:
- - Power Monitoring Expert,
- - Struxureware process Expert (PES),
- - Struxureware process Expert libraries,
- - Vijeo Citect (SCADA), and
- - Vijeo Citect Historian.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of this vulnerability based on their operational environment, architecture,
and product implementation.
BACKGROUND
Schneider Electric is a European-based company that maintains offices in 190
countries worldwide.
These products are industrial active energy management control products,
deployed across several sectors including the Commercial Facilities, Energy,
Food and Agriculture, Government Facilities, Transportation Systems, and Water
and Wastewater Systems. Schneider Electric estimates that these products are
used primarily in the United States and North America.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
UNQUOTED SEARCH PATH OR ELEMENT [b]
The Schneider Electric Floating License Manager has an "unquoted service path"
vulnerability. When the executable path of a service contains blanks,
attackers can exploit this to execute malicious programs.
CVE-2014-0759 [c] has been assigned to this vulnerability. A CVSS v2 base score
of 6.9 has been assigned; the CVSS vector string is (AV:L/AC:M/Au:N/C:C/I:C/A:C). [d]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability is not exploitable remotely and cannot be exploited without
user interaction. The exploit is only triggered when a local user runs the
vulnerable application, and the executable path of a service contains blanks.
Attackers can exploit this to start malicious programs as Windows service. To
avoid this, such service paths in the registry must be surrounded with quotes.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a moderate skill would be able to exploit this vulnerability.
MITIGATION
Deployment of the Schneider Electric products using the vulnerable floating
license manager are designed to be automatically updated via the Schneider
Electric Software Update system.
Schneider Electric’s latest download patches and known vulnerabilities are
available here:
http://www2.schneider-electric.com/sites/corporate/en/support/cybersecurity/cybersecurity.page
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 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 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]. Schneider Electric Security Notification SEVD 2014-015-01_v3, http://www.downloads.schneider-electric.com/?p_Conf=&p_localesFilter=&p_...,
web site last accessed February 27, 2014.
[b]. CWE-428: Unquoted Search Path or Element, http://cwe.mitre.org/data/definitions/428.html,
web site last accessed February 27, 2014.
[c]. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0759 , NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
[d]. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:L/AC:M/Au:N/C:C/I:C/A:C,
web site last accessed February 27, 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.
- --------------------------END INCLUDED TEXT--------------------
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The University of Queensland
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Qld 4072
Internet Email: auscert@auscert.org.au
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