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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.1207 Siemens OpenSSL Vulnerabilities 22 July 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: APE CP1543-1 ROX 1 ROX 2 S7-1500 WinCC OA (PVSS) Publisher: ICS-CERT Operating System: Network Appliance Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2014-3470 CVE-2014-0224 CVE-2014-0198 CVE-2010-5298 Reference: ASB-2014.0079 ASB-2014.0077 ASB-2014.0076 ESB-2014.0887 ESB-2014.0755 ESB-2014.0751 ESB-2014.0624.2 ESB-2014.0543 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-14-198-03 Comment: ICS-CERT reports that exploits that target these OpenSSL vulnerabilities are publicly available. - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-14-198-03) Siemens OpenSSL Vulnerabilities Original release date: July 17, 2014 | Last revised: July 18, 2014 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 identified four vulnerabilities in its OpenSSL cryptographic software library affecting several Siemens industrial products. Updates are available for APE 2.0.2 and WinCC OA (PVSS). The ROX 1, ROX 2, S7-1500, and CP1543-1 products do not have a patch at this time; however, Siemens has made mitigation recommendations. Siemens is continuing to work on patching these vulnerabilities. These vulnerabilities could be exploited remotely. Exploits that target OpenSSL vulnerabilities are publicly available. AFFECTED PRODUCTS The following Siemens products are affected: APE versions prior to Version 2.0.2 (only affected if SSL/TLS component or Crossbow is used), CP1543-1: all versions, ROX 1: all versions (only affected if Crossbow is installed), ROX 2: all versions (only affected if eLAN or Crossbow is installed), S7-1500: all versions, and WinCC OA (PVSS): Version 3.8 - 3.12 IMPACT The vulnerabilities identified could impact authenticity, integrity, and availability of affected devices. The man-in-the-middle attack could allow an attacker to hijack a session between an authorized user and the device. The other vulnerabilities reported could impact the availability of the device by causing the web server of the product to crash. 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. Siemens develops products mainly in the energy, healthcare and public health sectors, and transportation systems. The affected Siemens industrial products are for process and network control and monitoring in critical infrastructure sectors such as Chemical, Critical Manufacturing, Energy, Food and Agriculture, and Water and Wastewater Systems. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW MAN-IN-THE-MIDDLE[a] An attacker could perform a man-in-the-middle (MitM) attack between a vulnerable client and a vulnerable server. This vulnerability affects ROX, APE, S7-1500, and CP1543-1. CVE-2014-0224[b] has been assigned to this vulnerability. A CVSS v2 base score of 6.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:P).[c] IMPROPER INPUT VALIDATION[d] Specially crafted packets may crash the web server of the product. This vulnerability affects the SIMATIC S7-1500. CVE-2014-0198[e] has been assigned to this vulnerability. A CVSS v2 base score of 4.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:N/A:P).[f] IMPROPER INPUT VALIDATION[g] Specially crafted packets may crash the web server of the product. This vulnerability affects the SIMATIC S7-1500. CVE-2010-5298[h] has been assigned to this vulnerability. A CVSS v2 base score of 4.0 has been assigned; the CVSS vector string is (AV:N/AC:H/Au:N/C:N/I:P/A:P).[i] IMPROPER INPUT VALIDATION[j] Specially crafted packets may crash the web server of the product. This vulnerability affects the WinCC OA (PVSS). CVE-2014-3470[k] has been assigned to this vulnerability. A CVSS v2 base score of 4.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:N/A:P).[l] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTANCE OF EXPLOIT Exploits that target OpenSSL vulnerabilities are publicly available. DIFFICULTY An attacker with a moderate skill would be able to exploit these vulnerabilities. MITIGATION Siemens provides updates for the following products: APE 2.0.2 available at: http://support.automation.siemens.com/WW/view/en/97654933 WinCC OA (PVSS) available at the Siemens ETM portal. Siemens is preparing updates for the other affected products that will fix these vulnerabilities. Siemens will provide information and update their advisory (SSA-234763) when the new releases are available. In the meantime, customers should mitigate the risk of their products by implementing the following steps: ROX 1: all versions (only affected if Crossbow is installed) Use only in trusted networks. ROX 2: all versions (only affected if eLAN or Crossbow is installed) Follow the Application Note[m] if eLAN is installed on APE, or Update Debian using the standard update procedures if eLAN is installed on Linux system, or Use only in trusted networks. S7-1500: all versions Disable the web server, or Limit web server access to trusted networks only. CP1543-1: all versions for FTPS and SMTP: Disable or Use the VPN functionality to tunnel FTPS/SMTP, or Use only in trusted networks. Siemens also recommends protecting network access to all products except for perimeter devices such as CP1543-1 with appropriate mechanisms. It is advised to follow recommended security practices and to configure the environment according to operational guidelines[n] in order to run the devices in a protected IT environment. Siemens provides specific advice for mitigating risk in each of the affected products in SSA-234763, which can be found at its web site at the following location: http://www.siemens.com/cert/advisories ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. 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 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. 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 (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[o] for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks[p] for more information on social engineering attacks. a. CWE-310: Cryptographic Issues, http://cwe.mitre.org/data/definitions/310.html, web site last accessed July 17, 2014. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0224, web site last accessed July 17, 2014. c. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P, web site last accessed July 17, 2014. d. CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer, http://cwe.mitre.org/data/definitions/119.html, web site last accessed July 17, 2014. e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0198, web site last accessed July 17, 2014. f. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:N/A:P, web site last accessed July 17, 2014. g. CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), http://cwe.mitre.org/data/definitions/362.html, web site last accessed July 17, 2014. h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-5298, web site last accessed July 17, 2014. i. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:H/Au:N/C:N/I:P/A:P, web site last accessed July 17, 2014. j. CWE-476: NULL Pointer Dereference, http://cwe.mitre.org/data/definitions/476.html, web site last accessed July 17, 2014. k. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-3470, web site last accessed July 17, 2014. l. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:N/A:P, web site last accessed July 17, 2014. m. Siemens Application Notes, http://w3.siemens.com/mcms/industrial-communication/en/rugged-communicat..., web site last accessed July 17, 2014. n. Operational Guidelines for Industrial Security, http://www.industry.siemens.com/topics/global/en/industrial-security/Doc..., web site last accessed July 17, 2014. o. Recognizing and Avoiding Email Scams, http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last accessed July 17, 2014. p. National Cyber Alert System Cyber Security Tip ST04-014, http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed July 17, 2014 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. 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