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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0088
           ICS-CERT ADVISORY ICSA-13-016-01 - SCHNEIDER ELECTRIC
              AUTHENTICATED COMMUNICATION RISK VULNERABILITY
                              21 January 2013

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Schneider Electric Software Update
Publisher:         US-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-0655  

Original Bulletin: 
   http://www.us-cert.gov/control_systems/pdf/ICSA-13-016-01.pdf

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ICS-CERT ADVISORY ICSA-13-016-01 - SCHNEIDER ELECTRIC AUTHENTICATED COMMUNICATION
RISK VULNERABILITY 
January 16, 2013

OVERVIEW 

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 
exploited remotely.

AFFECTED PRODUCTS 

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 V1.0.0.0, 
* Smart Widget H8035 V1.0.0.0, 
* Smart Widget H8036 V1.0.0.0, 
* Smart Widget PM201 V1.0.0.0, 
* Smart Widget PM710 V1.0.0.0, 
* Smart Widget PM750 V1.0.0.0, 
* SoMachine V1.2.1, 
* Spacail.pro V1.0.0.x, and 
* SESU V1.0.x, V1.1.x

IMPACT 

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.

VULNERABILITY CHARACTERIZATION 

VULNERABILITY OVERVIEW 

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 
(AV:N/AC:M/Au:N/C:C/I:C/A:C). [c]

VULNERABILITY DETAILS 

EXPLOITABILITY 

This vulnerability could be exploited remotely.
 
EXISTENCE OF EXPLOIT 

No known public exploits exist that target this vulnerability. 

DIFFICULTY

An attacker with a medium skill level would be able to exploit this 
vulnerability.

MITIGATION 
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 
communication. 

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 
  devices. 

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.

ICS-CERT CONTACT 

For any questions related to this report, please contact ICS-CERT at: 
Email: ics-cert@hq.dhs.gov 
Toll Free: 1-877-776-7585 
For industrial control systems security information and incident reporting: 
www.ics-cert.org

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/ 

DOCUMENT FAQ 

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, 
http://cwe.mitre.org/data/definitions/287.html, 
CWE-287, Improper Authentication, Web site last accessed January 16, 2013.

b. NVD, 
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0655, 
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:N/AC:M/Au:N/C:C/I:C/A:C), 
Web site last accessed January 16, 2013.

d. Schneider Electric Customer Notification, 
http://www2.schneider-electric.com/corporate/en/support/cybersecurity/viewer-news.page?c_filepath=/templatedata/Content/News/data/en/local/cybersecurity/general_information/2013/01/20130109_advisory_of_vulnerability_affecting_schneider_electric_s_software_upda.xml, 
Web site last accessed January 16, 2012.

e. CSSP Recommended Practices, 
http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html, 
Web site last accessed January 16, 2013.

f. Targeted Cyber Intrusion Detection and Mitigation Strategies, 
http://www.us-cert.gov/control_systems/pdf/ICS-TIP-12-146-01A.pdf,
Web site last accessed January 16, 2013.

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