CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
AI Score
Confidence
Low
EPSS
Percentile
80.6%
This updated advisory is a follow-up to the updated advisory titled ICSA-15-099-01D Siemens SIMATIC HMI Devices Vulnerabilities that was published September 10, 2015, on the NCCIC/ICS‑CERT web site.
Siemens has identified three vulnerabilities in its SIMATIC HMI devices. These vulnerabilities were reported directly to Siemens by the Quarkslab team and Ilya Karpov from Positive Technologies. Siemens has produced updates that mitigate these vulnerabilities in all the affected products.
These vulnerabilities could be exploited remotely.
Siemens reports that the vulnerability affects the following SIMATIC products:
An attacker exploiting these vulnerabilities could conduct man-in-the-middle attacks, denial‑of‑ service attacks, and possibly authenticate themselves as valid users.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Siemens is a multinational company headquartered in Munich, Germany.
SIMATIC HMI Panels, SIMATIC WinCC Runtime Advanced, and SIMATIC WinCC Runtime Professional are used for operator control and monitoring of machines and plants. SIMATIC NET PC-Software is required for communication between controller (SIMATIC S7 controller) and PC-based solutions (e.g., SIMATIC WinCC). SIMATIC WinCC is a supervisory control and data acquisition (SCADA) system. It is used to monitor and control physical processes involved in industry and infrastructure on a large scale and over long distances. SIMATIC Automation Tool allows commissioning, adjusting, and service in combination with S7-1200 and S7-1500 Controllers without engineering framework. These products are deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that these products are used primarily in the United States and Europe with a small percentage in Asia.
Attackers with access to the network path between PLCs and their communication partners could possibly intercept or modify Siemens industrial communications at Port 102/TCP and conduct a man-in-the-middle attack.
This vulnerability affects all listed products except SIMATIC PCS 7.
CVE-2015-1601NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1601, web site last accessed April 09, 2015. has been assigned to this vulnerability. A CVSS v2 base score of 5.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:N).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:N, web site last accessed April 09, 2015.
Attackers with access to the network path between an HMI panel and a PLC (man-in-the-middle) could possibly conduct a denial-of-service attack against the HMI panel by sending specially crafted packets to the HMI (Port 102/TCP). This vulnerability affects SIMATIC WinCC Comfort Panels and SIMATIC WinCC Runtime Advanced.
CVE-2015-2822NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2822, web site last accessed April 23, 2015. has been assigned to this vulnerability. A CVSS v2 base score of 7.1 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:N/A:C).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:N/A:C, web site last accessed April 09, 2015.
If attackers obtain password hashes for SIMATIC WinCC users, they could possibly use the hashes to authenticate themselves. This vulnerability affects SIMATIC WinCC and SIMATIC PCS 7.
CVE-2015-2823NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2823, web site last accessed April 23, 2015. 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).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 April 09, 2015.
These vulnerabilities could be exploited remotely.
No known public exploits specifically target these vulnerabilities.
An attacker with medium skill level would be able to exploit these vulnerabilities.
Siemens provides updates for the following products and recommends customers update to the new fixed versions located at their corresponding web sites listed below:
For WinCC (TIA Portal) V12 or V13 devices, Siemens recommends updating the configuration to WinCC (TIA Portal) V13 SP1 and also updating the device version of the HMI to its latest version (provided with WinCC (TIA Portal) V13 SP1 Upd4). Until patches can be applied, Siemens recommends customers to mitigate the risk of their products by implementing the following steps:
As a general security measure Siemens strongly recommends protecting network access with appropriate mechanisms. In order to run the devices in a protected IT environment, it is advised to configure the environment according to Siemens’ operational guidelines.
For more information on these vulnerabilities and detailed instructions, please see Siemens Security Advisories SSA-487246 and SSA-237894 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. Specifically, users should:
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 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.
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