8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8 Medium
CVSS2
Access Vector
NETWORK
Access 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
0.975 High
EPSS
Percentile
100.0%
This updated advisory is a follow-up to the advisory update titled ICSA-16-103-01B Siemens Industrial Products glibc Library Vulnerability that was published July 14, 2016, on the NCCIC/ICS-CERT web site.
Siemens reports that a buffer overflow vulnerability in the glibc library could affect several of its industrial products.
Siemens has produced updates to mitigate this vulnerability in ROX II, APE devices, SINEMA Remote Connect, Basic RT V13, and SCALANCE M-800/S615.
This vulnerability could be exploited remotely. Exploits that target this vulnerability are known to be publicly available.
Siemens reports that the vulnerability affects the following products:
An attacker who successfully exploits this vulnerability may be able to cause a denial-of-service condition in the affected devices or possibly execute arbitrary code.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Siemens is a multinational company headquartered in Munich, Germany.
Siemens ROX-based devices are used to connect devices that operate in harsh environments such as electric utility substations and traffic control cabinets. RUGGEDCOM APE is a utility-grade computing platform that plugs directly into any member of the RUGGEDCOM RX1500 family and makes it possible to run third-party software applications without an external industrial PC. SINEMA Remote Connect is a management platform for remote networks allowing users to manage and maintain tunnel connections (VPN) between networks, machines, and sites. SCALANCE security modules provide filtering of incoming and outgoing network connections with stateful packet inspection.
According to Siemens, the affected devices are deployed across several sectors including Chemical, Communications, Critical Manufacturing, Dams, Energy, Food and Agriculture, Government Facilities, Healthcare and Public Health, Transportation Systems, and Water and Wastewater Systems. Siemens estimates that these products are used worldwide.
There is a stack-based buffer overflow vulnerability in the glibc library’s DNS client side resolver.
CVE-2015-7547b has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).c
This vulnerability could be exploited remotely.
Exploits that target this vulnerability are publicly available.
Crafting a working exploit for this vulnerability would be difficult.
Siemens provides updates for the following products and encourages customers to update their products:
<https://www.siemens.com/automation/support-request>
<https://w3.siemens.com/aspa_app/>
<http://support.automation.siemens.com/WW/view/en/109485761>
<https://support.industry.siemens.com/cs/ww/en/view/109311724>
<https://support.industry.siemens.com/cs/ww/en/view/109737963>
<https://support.industry.siemens.com/cs/ww/en/view/109740858>
Siemens recommends applying the following mitigations until patches can be applied:
OR
As a general security measure, Siemens strongly recommends to protect network access to nonperimeter devices with appropriate mechanisms. It is advised to configure the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-301706 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.
Contact Information
For any questions related to this report, please contact the CISA at:
Email: [email protected]
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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support.industry.siemens.com/cs/ww/en/view/109311724
support.industry.siemens.com/cs/ww/en/view/109737963
support.industry.siemens.com/cs/ww/en/view/109740858
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8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8 Medium
CVSS2
Access Vector
NETWORK
Access 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
0.975 High
EPSS
Percentile
100.0%