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AUSCERT External Security Bulletin Redistribution
ICS-CERT ADVISORY ICSA-13-016-01 - SCHNEIDER ELECTRIC
AUTHENTICATED COMMUNICATION RISK VULNERABILITY
21 January 2013
AusCERT Security Bulletin Summary
Product: Schneider Electric Software Update
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
CVE Names: CVE-2013-0655
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ICS-CERT ADVISORY ICSA-13-016-01 - SCHNEIDER ELECTRIC AUTHENTICATED COMMUNICATION
January 16, 2013
ICS-CERT has received a report from Schneider Electric concerning an
Authenticated Communication Risk vulnerability in the Schneider Electric
Software Update utility (SESU). This vulnerability was reported to Schneider
Electric by security researcher Arthur Gervais. The SESU is a centralized
update mechanism for updating Schneider Electric software on Windows PC.
Schneider Electric has updated the SESU client as of January 2013, which adds
the use of HTTPS to resolve this vulnerability. This vulnerability could be
According to Schneider Electric, the following products and versions are
affected by use of the SESU mechanism:
* Unity Pro, V5.0 L, M, S, XL,
* Unity Pro, V6.0 L, M, S, XL,
* Unity Pro, V6.1 L, M, S, XL,
* Unity Pro, V0 L, M, S, XL, XLS,
* Vijeo Designer V6.0.x, V6.1.0.x, V5.0.0.x, V5.1.0.x,
* Vijeo Designer Opti V6.0.x, V5.1.0.x, V5.0.0.x,
* Web Gate Client Files V5.1.x,
* IDS V1.0, V2.0,
* PowerSuite 2.5,
* Smart Widget Acti 9 V18.104.22.168,
* Smart Widget H8035 V22.214.171.124,
* Smart Widget H8036 V126.96.36.199,
* Smart Widget PM201 V188.8.131.52,
* Smart Widget PM710 V184.108.40.206,
* Smart Widget PM750 V220.127.116.11,
* SoMachine V1.2.1,
* Spacail.pro V1.0.0.x, and
* SESU V1.0.x, V1.1.x
Successfully exploiting this vulnerability could result in arbitrary
code execution. 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 manufacturer and integrator of energy management equipment and
software. According to Schneider Electric, their products are used in energy,
industry, and building automation worldwide.
AUTHENTICATED COMMUNICATIONS RISK [a]
Schneider Electric software on the customer PC uses the SESU service as the
mechanism of communication with the Schneider Electric central update server
in order to receive periodic software updates. The SESU client on the customer
PC does not check the authenticity of the origin. By redirecting messages to
Port 80/TCP on an unauthorized source, an attacker could execute arbitrary
code on a vulnerable system that could result in loss of availability,
integrity, and confidentiality.
CVE-2013-0655 [b] has been assigned to this vulnerability. A CVSS v2 base score
of 9.3 has been assigned; the CVSS vector string is
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits exist that target this vulnerability.
An attacker with a medium skill level would be able to exploit this
Schneider Electric has produced a customer notification [d] that contains
mitigations to resolve this vulnerability. According to Schneider Electric,
in order to resolve the vulnerability with the software server, Schneider
Electric has taken the following actions:
1. The SESU server has been updated to the latest version. Currently, both
HTTP and HTTPS are supported in parallel. HTTPS does ensure signed
2. The new SESU client has been updated as of January 2013 to use HTTPS
instead of HTTP. The new version of the SESU Client will be made available
to customers for distribution via the SESU mechanism in January 2013.
3. Customers can also use an updated software product CD that will contain
the updated SESU client, when the CD becomes available. Contact your local
support desk for details.
4. While both HTTP and HTTPS SESU client functionality is supported currently,
several months after starting to update the SESU clients (May 2013) the HTTP
port of the SESU server will be disabled. This means that only HTTPS will be
supportedduring SESU client updates from that time forward, which mitigates
this current vulnerability.
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. Critical devices
should not directly face 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
ICS-CERT also provides a section for control systems security recommended
practices on the US-CERT Web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies. [e] ICS-CERT reminds
organizations to perform proper impact analysis and risk assessment prior to
taking defensive measures.
Additional mitigation guidance and recommended practices are publicly available
in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01A - Targeted
Cyber Intrusion Detection and Mitigation Strategies, [f] that is available for
download from the ICS-CERT Web page (www.ics-cert.org)
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.
For any questions related to this report, please contact ICS-CERT at:
Toll Free: 1-877-776-7585
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You can
help by answering a short series of questions about this product at the
following URL: http. s://forms.us-cert.gov/ncsd-feedback/
What is an ICS-CERT Advisory? An ICS-CERT Advisory is intended to provide
awareness orsolicit feedback from critical infrastructure owners and
operators concerningongoing cyber events or activity with the potential to
impact critical infrastructure computing networks.
When is vulnerability attribution provided to researchers?
Attribution for vulnerability discovery is always provided to the
vulnerability reporter unless the reporter notifies ICS-CERT that they
wish to remain anonymous. ICS-CERT encourages researchers to coordinate
vulnerability details before public release. The public release of
vulnerability details prior to the development of proper mitigations may put
industrial control systems and the public at avoidable risk.
a. CWE-287: Improper Authentication,
CWE-287, Improper Authentication, Web site last accessed January 16, 2013.
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,
Web site last accessed January 16, 2013.
d. Schneider Electric Customer Notification,
Web site last accessed January 16, 2012.
e. CSSP Recommended Practices,
Web site last accessed January 16, 2013.
f. Targeted Cyber Intrusion Detection and Mitigation Strategies,
Web site last accessed January 16, 2013.
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