ID CVE-2016-7987 Type cve Reporter cve@mitre.org Modified 2017-03-14T19:59:00
Description
An issue was discovered in Siemens ETA4 firmware (all versions prior to Revision 08) of the SM-2558 extension module for: SICAM AK, SICAM TM 1703, SICAM BC 1703, and SICAM AK 3. Specially crafted packets sent to Port 2404/TCP could cause the affected device to go into defect mode. A cold start might be required to recover the system, a Denial-of-Service Vulnerability.
{"ics": [{"lastseen": "2020-12-18T03:21:50", "bulletinFamily": "info", "cvelist": ["CVE-2016-7987"], "description": "## OVERVIEW\n\nStephan Beirer, Markus Mahrla, Toralf Gimpel, and Sebastian Krause, from GAI NetConsult GmbH, and Adam Crain of Automatak LLC have identified a denial-of-service vulnerability in Siemens SICAM products. Siemens has produced a firmware update to mitigate this vulnerability.\n\nThis vulnerability could be exploited remotely.\n\n## AFFECTED PRODUCTS\n\nSiemens reports that the vulnerability affects the following versions of SICAM:\n\n * ETA4 firmware (all versions prior to Revision 08) of the SM-2558 extension module for:\n * SICAM AK,\n * SICAM TM 1703,\n * SICAM BC 1703, and\n * SICAM AK 3\n * ETA2 firmware (Revision 11.01 and earlier) of the SM-2556 extension module for:\n * SICAM AK,\n * SICAM TM, and\n * SICAM BC.\n\n## IMPACT\n\nSuccessful exploitation of this vulnerability could cause a denial of service. A cold start might be required to recover the system.\n\nImpact 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.\n\n## BACKGROUND\n\nSiemens is a multinational company headquartered in Munich, Germany.\n\nThe affected products, SM-2558 and SM-2556, are communication modules used to connect networked industrial components. According to Siemens, SM-2558 and SM-2556 communication modules are deployed across several sectors including the energy sector. Siemens estimates that these products are used worldwide.\n\n## VULNERABILITY CHARACTERIZATION\n\n### VULNERABILITY OVERVIEW\n\n### DENIAL OF SERVICEa\n\nSpecially crafted packets sent to Port 2404/TCP could cause the affected device to go into defect mode. A cold start might be required to recover the system.\n\nCVE-2016-7987b has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).c\n\n### VULNERABILITY DETAILS\n\n#### EXPLOITABILITY\n\nThis vulnerability could be exploited remotely.\n\n#### EXISTENCE OF EXPLOIT\n\nNo known public exploits specifically target this vulnerability.\n\n#### DIFFICULTY\n\nAn attacker with a low skill would be able to exploit this vulnerability.\n\n## MITIGATION\n\nSiemens provides firmware ETA4 Revision 08 for SM-2558 that fixes the vulnerability and recommends customers update to the fixed version.\n\n<http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/substation-automation/substation-automation/Pages/Overview.aspx>\n\nFor the SM-2556 extension module, Siemens recommends customers contact the support center at: [support.energy@siemens.com](<mailto:support.energy@siemens.com>)\n\nUntil patches can be applied, Siemens advises to apply the following steps to mitigate the risk:\n\n * Use a firewall or the IPsec functionality of the SM-2558 module to restrict access to Port 2404/TCP\n * The SICAM RTUs ADMINISTRATOR Security Manual:\n\n[www.downloads.siemens.com/download-center/d/SIC_RTUs_ADMIN_SECURITY_ENG.pdf?mandator=ic_sg&segment=Global&fct=downloadasset&pos=download&id1=DLA05_43299](<http://www.downloads.siemens.com/download-center/d/SIC_RTUs_ADMIN_SECURITY_ENG.pdf?mandator=ic_sg&segment=Global&fct=downloadasset&pos=download&id1=DLA05_43299>)\n\n * Always run RTUs in trusted networks.\n\nAs a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). It is advised to configure the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.\n\nSiemens recommends security guidelines to Secure Substation:\n\n<http://www.siemens.com/gridsecurity>\n\nFor more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-296574 at the following location:\n\n<http://www.siemens.com/cert/advisories>\n\nICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:\n\n * Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.\n * Locate control system networks and remote devices behind firewalls, and isolate them from the business network.\n * 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.\n\nICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\n\nICS-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.\n\nAdditional mitigation guidance and recommended practices are publicly available in the ICS\u2011CERT 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.\n\nOrganizations 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.\n\n * a. CWE-400: Uncontrolled Resource Consumption (\u2018Resource Exhaustion\u2019), https://cwe.mitre.org/data/definitions/400.html, web site last accessed October 25, 2016.\n * b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7987, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory.\n * c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, web site last accessed October 25, 2016.\n\n## \nContact Information\n\nFor any questions related to this report, please contact the CISA at: \n \nEmail: [CISAservicedesk@cisa.dhs.gov](<mailto:cisaservicedesk@cisa.dhs.gov>) \nToll Free: 1-888-282-0870\n\nFor industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics \nor incident reporting: https://us-cert.cisa.gov/report\n\nCISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.\n\nThis product is provided subject to this Notification and this [Privacy & Use](<https://www.dhs.gov/privacy-policy>) policy.\n\n**Please share your thoughts.**\n\nWe recently updated our anonymous [product survey](<https://surveymonkey.com/r/G8STDRY?product=https://us-cert.cisa.gov/ics/advisories/ICSA-16-299-01>); we'd welcome your feedback.\n", "edition": 16, "modified": "2016-11-07T00:00:00", "published": "2016-10-25T00:00:00", "id": "ICSA-16-299-01", "href": "https://www.us-cert.gov//ics/advisories/ICSA-16-299-01", "title": "Siemens SICAM RTU Devices Denial-of-Service Vulnerability", "type": "ics", "cvss": {"score": 7.8, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:C"}}]}
