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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2514.2 Advisory (ICSA-17-278-01) GE CIMPLICITY Stack-based Buffer Overflow 11 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: GE CIMPLICITY Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Denial of Service -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2017-12732 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-278-01 https://ics-cert.us-cert.gov/advisories/ICSA-17-278-01A Revision History: October 11 2017: More information on driver support October 6 2017: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-278-01) GE CIMPLICITY Original release date: October 05, 2017 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/. CVSS v3 8.8 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: GE Equipment: CIMPLICITY Vulnerability: Stack-based Buffer Overflow AFFECTED PRODUCTS The following versions of CIMPLICITY, an HMI/SCADA management platform, are affected: CIMPLICITY Versions 9.0 and prior. IMPACT 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. MITIGATION 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 8.0, 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): https://digitalsupport.ge.com/communities/CC_Contact (link is external) NCCIC/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 ICSCERT 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. VULNERABILITY OVERVIEW STACK-BASED BUFFER OVERFLOW CWE-121 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. CVE-2017-12732 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). RESEARCHER David Atch of CyberX reported the vulnerability to ICS-CERT. BACKGROUND 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 ========================================================= Advisory (ICSA-17-278-01A) GE CIMPLICITY (Update A) Original release date: October 05, 2017 | Last revised: October 10, 2017 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/. CVSS v3 6.8 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: GE Equipment: CIMPLICITY Vulnerability: Stack-based Buffer Overflow UPDATED INFORMATION 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. AFFECTED PRODUCTS The following versions of CIMPLICITY, an HMI/SCADA management platform, are affected: CIMPLICITY Versions 9.0 and prior. - --------- Begin Update A Part 1 of 3 -------- - 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. - --------- End Update A Part 1 of 3 ---------- IMPACT 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. MITIGATION - --------- Begin Update A Part 2 of 3 -------- 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): https://digitalsupport.ge.com/communities/CC_Contact (link is external) - --------- End Update A Part 2 of 3 -------- 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 ICSCERT 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. VULNERABILITY OVERVIEW STACK-BASED BUFFER OVERFLOW CWE-121 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. - --------- Begin Update A Part 3 of 3 -------- CVE-2017-12732 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been assigned; the CVSS vector string is (AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H). - --------- End Update A Part 3 of 3 -------- RESEARCHER David Atch of CyberX reported the vulnerability to ICS-CERT. BACKGROUND 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 Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) 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-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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