This updated advisory is a follow-up to the advisory update titled ICSA-20-042-04 Siemens PROFINET-IO Stack (Update G) that was published April 14, 2022 to the ICS webpage on cisa.gov/ics.
Successful exploitation of this vulnerability could lead to a denial-of-service condition.
Products that include the Siemens PROFINET-IO (PNIO) stack in versions prior to v06.00 are affected. Additionally, Siemens recommends other vendors of PROFINET devices check their products for vulnerable versions of the Siemens PNIO stack as part of the Siemens Development/Evaluation Kits.
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PROFINET-IO (PNIO) stack versions prior v06.00 do not properly limit internal resource allocation when multiple legitimate diagnostic package requests are sent to the DCE-RPC interface. This could lead to a denial-of-service condition due to lack of memory for devices that include a vulnerable version of the stack.
CVE-2019-13946 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).
Yuval Ardon and Matan Dobrushin of OTORIO reported this vulnerability to CISA and Siemens.
Siemens has released updates for several affected products and recommends users update to the new version. Siemens is preparing further updates and recommends specific countermeasures until patches are available.
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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 on the Siemens industrial security webpage.
For more information, please see Siemens security advisory: SSA-780073
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 cisa.gov/ics 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 cisa.gov/ics 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-2019-13946
www.siemens.com/cert/advisories
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cisa.gov/ics
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cwe.mitre.org/data/definitions/400.html
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