This updated advisory is a follow-up to the advisory update ICSA-19-227-04 Siemens SINAMICS (Update B) that was published December 10, 2019, to the ICS webpage on us-cert.gov.
Successful exploitation of this vulnerability may allow an attacker to perform a denial-of-service attack.
Siemens reports the vulnerability affects webservers of the following industrial products:
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The webserver of the affected devices contains a vulnerability that may lead to a denial-of-service condition. An attacker may cause a denial-of-service situation, leading to a restart of the webserver of the affected device. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction.
CVE-2019-6568 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Siemens reported this vulnerability to CISA.
Siemens currently recommends the following updates for the following products:
SINAMICS GH150 v4.7 (Control Unit), SINAMICS GH150 v4.8 (Control Unit, SINAMICS GL150 v4.7 (Control Unit), SINAMICS GL150 v4.8 (Control Unit), SINAMICS GM150 v4.7 (Control Unit), and SINAMICS GM150 v4.8 (Control Unit)
SINAMICS SL150 v4.7 (Control Unit)
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SINAMICS SL150 v4.8 (Control Unit)
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SINAMICS SM120 v4.7 and v4.8 (Control Unit)
SINAMICS SM150 v4.8 (Control Unit)
The update can be obtained from a Siemens representative or via Siemens customer service.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemensβ operational guidelines for industrial security, and follow the recommendations in the product manuals. Additional information on industrial security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For more information on the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-530931
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov. 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 on the ICS webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6568
www.siemens.com/cert/advisories
assets.new.siemens.com/siemens/assets/public.1502968141.411e91564a2d259ecd4b6c79b51f89c044b3de81.operational-guidelines-industrial-security-en.pdf
cwe.mitre.org/data/definitions/400.html
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