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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2414 Siemens SIMATIC STEP 7 (TIA Portal) Information Disclosure Vulnerabilities 14 October 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SIMATIC STEP 7 (TIA Portal) Publisher: ICS-CERT Operating System: Windows Impact/Access: Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-7960 CVE-2016-7959 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-287-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-287-03) Siemens SIMATIC STEP 7 (TIA Portal) Information Disclosure Vulnerabilities Original release date: October 13, 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 Siemens has released a new version of SIMATIC STEP 7 (TIA Portal) to mitigate information disclosure vulnerabilities. These vulnerabilities were reported directly to Siemens by Dmitry Sklyarov and Gleb Gritsai from Positive Technologies. Siemens has produced a new version to mitigate these vulnerabilities. AFFECTED PRODUCTS Siemens reports that the vulnerabilities affect the following versions of SIMATIC STEP 7 (TIA Portal): SIMATIC STEP 7 (TIA Portal): All versions prior to V14 IMPACT A local attacker who exploits these vulnerabilities may be able to access sensitive information contained in TIA Portal project files under certain conditions. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Siemens is a multinational company headquartered in Munich, Germany. The affected product, SIMATIC Step 7 (TIA Portal), is engineering software for SIMATIC products. According to Siemens, SIMATIC Step 7 (TIA Portal) is deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that this product is used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW INADEQUATE ENCRYPTION STRENGTH[a] Local attackers with read access to TIA Portal project files could brute-force preshared keys used for machine-to-machine communication with possibly reduced effort. CVE-2016-7959[b] has been assigned to this vulnerability. A CVSS v3 base score of 2.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).[c] CRYPTOGRAPHIC ISSUES[d] Local attackers could circumvent the protection of the transport format of TIA Portal project files and potentially access sensitive configuration settings. This format is used by TIA Portal during the migration of project files to a new version (e.g., V12 to V13). CVE-2016-7960[e] has been assigned to this vulnerability. A CVSS v3 base score of 2.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).[f] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities are not exploitable remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY Crafting a working exploit for these vulnerabilities would be difficult. MITIGATION Access to the TIA Portal project files on engineering workstations or network storage must be protected with appropriate mechanisms from unauthorized access. Siemens provides SIMATIC STEP 7 (TIA Portal) V14, which fixes the vulnerabilities and recommends users migrate projects to the new version. It can be found at the following location on the Siemens web site: https://support.industry.siemens.com/cs/ww/en/view/109740340 Siemens strongly recommends users protect network access to engineering workstations and project storage with appropriate mechanisms. Siemens also advises that users configure the operational environment according to Siemens' Operational Guidelines for Industrial Security: https://www.siemens.com/cert/operational-guidelines-industrial-security For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-869766 at the following location: http://www.siemens.com/cert/advisories ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Generally, 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. a. CWE-326: Inadequate Encryption Strength, https://cwe.mitre.org/data/definitions/326.html, web site last accessed October 13, 2016. b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7959, 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:H/PR:L/UI:N/S..., web site last accessed October 13, 2016. d. CWE-310: Cryptographic Issues, https://cwe.mitre.org/data/definitions/310.html, web site last accessed October 13, 2016. e. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7960, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S..., web site last accessed October 13, 2016. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov 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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