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CVSS v3 6.8
ATTENTION: Remotely exploitable/low skill level to exploit.
Vulnerability: Stack-based Buffer Overflow
This updated advisory is a follow-up to the original advisory titled ICSA-17-278-01 GE CIMPLICITY that was published October 5, 2017, on the NCCIC/ICS-CERT web site.
The following versions of CIMPLICITY, an HMI/SCADA management platform, are affected:
- CIMPLICITY Versions 9.0 and prior.
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From CIMPLICITY 6.1 forward, users have been advised that S90 drivers were no longer supported and an alternate tool was provided. CIMPLICITY 9.5 removed the drivers from the product.
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Successful exploitation of this vulnerability could cause the device that the attacker is accessing to crash; a buffer overflow condition may allow arbitrary remote code execution.
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GE has released CIMPLICITY software Version 9.5 and they recommend that users update to that version or the latest version. The Series 90 TCP/IP communications support has been deprecated and users are encouraged to use the “convert to triplex” application tool, which has been available since CIMPLICITY Version 6.1, to obtain communication support if needed. Documentation and information on procedures, as well as the upgrade to Version 9.5, can be located at the following location (login required):
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ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- 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 reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
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.
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 for more information on avoiding email scams.
- Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploits specifically target this vulnerability.
A function reads a packet to indicate the next packet length. The next packet length is not verified, allowing a buffer overwrite that could lead to an arbitrary remote code execution.
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David Atch of CyberX reported the vulnerability to ICS-CERT.
Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Dams, Energy, Food and Agriculture, Government Facilities, Transportation Systems, Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Boston, Massachusetts
For any questions related to this report, please contact the NCCIC at:
Toll Free: 1-888-282-0870
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