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AUSCERT External Security Bulletin Redistribution
ESB-2012.0086
Schneider Electric Modicon Quantum PLC: Administrator compromise
25 January 2012
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AusCERT Security Bulletin Summary
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Product: Schneider Electric Modicon Quantum PLC
Publisher: Industrial Control Systems Cyber Emergency Response Team
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Resolution: Mitigation
Original Bulletin:
http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-12-020-03.pdf
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ICS-CERT Alert
ICS-ALERT-12-020-03—SCHNEIDER ELECTRIC MODICON QUANTUM MULTIPLE VULNERABILITIES
January 20, 2012
ALERT
SUMMARY
ICS-CERT is aware of a public report of multiple vulnerabilities affecting
Schneider Electric Modicon Quantum PLC. According to this report, these
vulnerabilities are exploitable through backdoor accounts (previously
disclosed), a malformed HTTP or FTP requests, or cross-site scripting (XSS).
This report is based on information presented by the Project Basecamp team
during Digital Bond’s SCADA Security Scientific Symposium (S4), on
January19, 2012. The vulnerability information is based on research conducted
by Rubén Santamarta; the information was released without coordination with
either the vendor or ICS-CERT. ICS-CERT has notified Schneider Electric of the
report and has asked the vendor to confirm the vulnerability and identify
mitigations. ICS-CERT is issuing this alert to provide preliminary notice of
the reported vulnerable products and to begin identifying baseline mitigations
that can reduce the risk of cybersecurity attacks that may exploit these
vulnerabilities. The presentation summarized the following vulnerabilities
without going into detail:
Vulnerability Type Exploitability Impact
No authentication between Unity Remote Denial of Service
software and PLC. Possible Remote Code Execution
Backdoor accounts Remote Access system as user or administrator
HTTP Server buffer overflows Remote Denial of Service
FTP Server buffer overflows Remote Denial of Service
XSS Remote Unknown
In addition, the Project Basecamp team identified approximately two hundred
instances of Modicon Quantum PLCs directly facing the Internet. ICS-CERT reminds
users that the use of readily available and generally free search tools (such as
SHODAN and ERIPP) significantly reduces time and resources required to identify
Internet facing control systems. In turn, hackers can use these tools combined
with the exploit modules to identify and attack vulnerable control systems.
Conversely, owners and operators can also use these same tools to audit their
assets for unsecured Internet facing devices. For more information, ICS-CERT
recommends reviewing: ICS-ALERT-11-343-01—Control System Internet
Accessibility.
Please report any cyber issues affecting control systems to ICS-CERT.
Schneider Electric is a manufacturer and integrator of energy management equipment
and software; its systems are found in the energy, manufacturing, building
automation, and information technology, with operations in over 100 countries
worldwide. The Schneider Electric Modicon PLC line contains many different devices
designed for different uses and environments.
MITIGATION
ICS-CERT is currently coordinating with the vendor and security researcher to
identify useful mitigations.
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. Control system
devices should not directly face the Internet.
• Locate control system networks and devices behind firewalls, and isolate them
from the business network.
• If remote access is required, employ secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPN is only as secure as the connected devices.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to taking defensive measures.
The Control Systems Security Program (CSSP) also provides a recommended practices
section for control systems on the US-CERT website. Several recommended practices
are available for reading or download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies. Organizations that observe
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
ICS-CERT Operations Center
1-877-776-7585
ics-cert@dhs.gov
For CSSP Information and Incident Reporting: www.ics-cert.org
a. http://www.us-cert.gov/control_systems/pdf/ICSA-12-018-01.pdf website last
accessed January 20, 2012
b. ICS-CERT ALERT, http://www.us-cert.gov/control_systems/pdf/ICS-Alert-10-301-01.pdf,
website last accessed January 20, 2012
c. Control System Security Program (CSSP) Recommended Practices,
http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html,
website last accessed January 20, 2012.
DOCUMENT FAQ
What is an ICS-CERT Alert? An ICS-CERT Alert is intended to provide timely
notification to critical infrastructure owners and operators concerning threats
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.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
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On call after hours for member emergencies only.
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