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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1732 GE Proficy HMI SCADA CIMPLICITY Privilege Management Vulnerability 14 July 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: GE Proficy HMI SCADA CIMPLICITY Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-5787 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-16-194-02 Comment: Although proof of concept code has recently being published, the vulnerability affects an older version of the software that was patched in 2014. - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-194-02) GE Proficy HMI SCADA CIMPLICITY Privilege Management Vulnerability Original release date: July 12, 2016 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/. OVERVIEW Zhou Yu of Acorn Network Security identified an improper privilege management vulnerability and recently released exploit code for the GE Proficy HMI/SCADA CIMPLICITY application without coordination with ICS-CERT, the vendor, or any other coordinating entity known to ICS-CERT. GE produced a new version to mitigate this vulnerability in August 2014. Exploits that target this vulnerability are known to be publicly available. AFFECTED PRODUCTS The following Proficy HMI/SCADACIMPLICITY versions are affected: CIMPLICITY Version 8.2, SIM 26 or earlier. IMPACT Successful exploitation of the vulnerability may allow an authenticated user on the system to modify the configuration of the CIMPLICITY service and launch any executable on the system as a service. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND GE is a US-based company that maintains offices in several countries around the world. The affected product, Proficy HMI/SCADACIMPLICITY, is a Client/Server-based human-machine interface/supervisory control and data acquisition (HMI/SCADA) application. According to GE, Proficy HMI/SCADACIMPLICITY is deployed across several sectors. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW IMPROPER PRIVILEGE MANAGEMENT [a] Vulnerable versions may allow users to modify the CIMPLICITY service to edit the configuration of a service. CVE-2016-5787 [b] has been assigned to this vulnerability. A CVSS v3 base score of 5.7 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L). [c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability is not exploitable remotely and cannot be exploited without user interaction. The exploit is only triggered when a local user runs the vulnerable application and loads a malicious file. EXISTENCE OF EXPLOIT Exploits that target this vulnerability are publicly available. DIFFICULTY An attacker with a low skill would be able to exploit this vulnerability. Social engineering is required to convince the user to accept a malicious file. Additional user interaction is needed to load the malformed file. This decreases the likelihood of a successful exploit. MITIGATION In response to a recent public disclosure of proof-of-concept exploit code, GE has released a notification to its users of the identified vulnerability in an older version of the Proficy HMI/SCADACIMPLICITY application, along with the mitigation. GEs notification is available at the following location: https://ge-ip.force.com/communities/en_US/Article/GE-Digital-Security-Advisory-GED-16-01 (link is external) In August 2014, GE released a new version of Proficy HMI/SCADACIMPLICITY, Version 8.2, Sim 27 that mitigated the identified vulnerability, which is available at the following location with a valid account: https://ge-ip.force.com/communities/en_US/Download/CIMPLICITY-8-2-SIM-27-DN (link is external) GE recommends that users upgrade to Proficy HMI/SCADACIMPLICITY, Version 8.2, SIM 27 or later versions. The latest version of CIMPLICITY Version 8.2 SIM 43, is available at the following location, with a valid account: https://ge-ip.force.com/communities/en_US/Download/CIMPLICITY-8-2-SIM-43 (link is external) 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 at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 (http://ics-cert.us-cert.gov/). 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 [d] for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks [e] for more information on social engineering attacks. a. CWE-269: Improper Privilege Management, http://cwe.mitre.org/data/definitions/269.html, web site last accessed July 12, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5787, 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, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S..., web site last accessed July 12, 2016. d. Recognizing and Avoiding Email Scams, http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last accessed July 12, 2016. e. National Cyber Alert System Cyber Security Tip ST04-014, http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed July 12, 2016. 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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