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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2853 Siemens SICAM PAS Vulnerabilities 5 December 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SICAM PAS Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Increased Privileges -- Existing Account Modify Arbitrary Files -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2016-9157 CVE-2016-9156 CVE-2016-8567 CVE-2016-8566 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-336-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-336-01) Siemens SICAM PAS Vulnerabilities Original release date: December 01, 2016 | Last revised: December 02, 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 an advisory to inform its users on how to mitigate vulnerabilities that affect SICAM PAS. Ilya Karpov and Dmitry Sklyarov of Positive Technologies and Sergey Temnikov and Vladimir Dashchenko of Kaspersky Lab coordinated these vulnerabilities directly with Siemens. Siemens has produced an update to mitigate some of these vulnerabilities. Some of these vulnerabilities could be exploited remotely. AFFECTED PRODUCTS The following SICAM PAS versions are affected: SICAM PAS: All versions. IMPACT Successful exploitation of these vulnerabilities may allow an attacker to cause a denial-of-service condition or remotely exploit arbitrary code. 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, SICAM PAS, is energy automation software for operating electrical substations. According to Siemens, SICAM PAS is deployed across the Energy sector. Siemens estimates that this product is used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW USE OF HARD-CODED CREDENTIALS[a] A factory account with hard-coded passwords is present in the SICAM PAS installations. Attackers might gain privileged access to the database over Port 2638/TCP. SICAM PAS Versions 8.00 and higher are not affected by this vulnerability. CVE-2016-8567[b] has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[c] STORING PASSWORDS IN A RECOVERABLE FORMAT[d] An authenticated local attacker with certain privileges could possibly reconstruct the passwords of users for accessing the database. SICAM PAS Versions 8.00 and higher are not affected by this vulnerability. CVE-2016-8566[e] has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).[f] FILES OR DIRECTORIES ACCESSIBLE TO EXTERNAL PARTIES[g] A remote attacker could use specially crafted packets sent to Port 19235/TCP to upload, download, or delete files in certain parts of the file system. CVE-2016-9156[h] has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).[i] WEAKNESSES THAT AFFECT MEMORY[j] Specially crafted packets sent to port 19234/TCP could cause a denial of service condition and potentially lead to unauthenticated remote code execution. CVE-2016-9157[k] has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[l] VULNERABILITY DETAILS EXPLOITABILITY Some of these vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with low skill would be able to exploit these vulnerabilities. MITIGATION SICAM PAS Versions 8.00 and higher fix some of these vulnerabilities. Siemens recommends that users upgrade to the latest version. In order to receive the SICAM PAS V8.08 update, please contact the Siemens Energy Customer Support Center at support.energy@siemens.com (link sends e-mail). For the remaining vulnerabilities Siemens recommends users explicitly block access to Ports 19235/TCP and 19234/TCP with appropriate mechanism, e.g., using the Windows firewall, until patches are available. Siemens strongly recommends users protect network access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). 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 (link is external) For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-946325 at the following location: http://www.siemens.com/cert/advisories (link is external) 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 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-798: Use of Hard-coded Credentials, https://cwe.mitre.org/data/definitions/798.html, web site last accessed December 01, 2016. b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8567, 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:N/AC:L/PR:N/UI:N/S..., web site last accessed December 01, 2016. d. CWE-257: Storing Passwords in a Recoverable Format, https://cwe.mitre.org/data/definitions/257.html, web site last accessed December 01, 2016. e. NVD,https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8566, 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:L/PR:L/UI:N/S..., web site last accessed December 01, 2016. g. CWE-552: Files or Directories Accessible to External Parties, https://cwe.mitre.org/data/definitions/552.html, web site last accessed December 01, 2016. h. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9156, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. i. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed December 01, 2016. j. CWE-633: Weaknesses that Affect Memory, https://cwe.mitre.org/data/definitions/633.html, web site last accessed December 01, 2016. k. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9157, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. l. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed December 01, 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. 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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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