9 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:S/C:C/I:C/A:C
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.001 Low
EPSS
Percentile
45.2%
This updated advisory is a follow-up to the advisory update titled ICSA-19-134-08 Siemens SIMATIC PCS7, WinCC, TIA Portal (Update C) that was published September 10, 2019, on the ICS webpage on us-cert.gov.
Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary commands on the affected system.
The following Siemens SIMATIC products are affected:
--------- Begin Update D Part 1 of 2 --------
--------- End Update D Part 1 of 2 ---------
4.2.1 SQL INJECTION CWE-89
An attacker with network access to the project file could run arbitrary system commands with the privileges of the local database server. This may impact the confidentiality, integrity, and availability of the affected system.
CVE-2019-10916 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
4.2.2 UNCAUGHT EXCEPTION CWE-248
An attacker with local access to the project file could cause a denial-of-service condition on the affected product as the project file is loaded. Successful exploitation could compromise availability of the affected system.
CVE-2019-10917 has been assigned to this vulnerability. A CVSS v3 base score of 3.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L).
4.2.3 EXPOSED DANGEROUS METHOD OR FUNCTION CWE-749
An authenticated attacker with network access to the DCOM interface could execute arbitrary commands with SYSTEM privileges. Successful exploitation could compromise confidentiality, integrity, and availability of the affected system.
CVE-2019-10918 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Vladimir Dashchenko and Sergey Temnikov from Kaspersky Lab, CNCERT/CC, and ChengBin Wang from Guoli Security Technology reported these vulnerabilities to Siemens.
Siemens has an update available for the following affected products:
--------- Begin Update D Part 2 of 2 --------
---------- End Update D Part 2 of 2 ---------
Siemens recommends users apply the following specific workarounds and mitigations to reduce risk until updates or patches are available:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure their environment according to the Siemens 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 these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-697412 at the following location:
<http://www.siemens.com/cert/advisories>
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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-12-146-01BโTargeted 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 these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10916
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10917
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10918
www.siemens.com/cert/advisories
cwe.mitre.org/data/definitions/248.html
cwe.mitre.org/data/definitions/749.html
cwe.mitre.org/data/definitions/89.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109747387
support.industry.siemens.com/cs/ww/en/view/109747394
support.industry.siemens.com/cs/ww/en/view/109763890
support.industry.siemens.com/cs/ww/en/view/109763892
support.industry.siemens.com/cs/ww/en/view/109767227
support.industry.siemens.com/cs/ww/en/view/109768093
support.industry.siemens.com/cs/ww/en/view/109768093
support.industry.siemens.com/cs/ww/en/view/109768093
support.industry.siemens.com/cs/ww/en/view/109768972
support.industry.siemens.com/cs/ww/en/view/109768972
twitter.com/CISAgov
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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www.oig.dhs.gov/
www.siemens.com/industrialsecurity
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-134-08
www.us-cert.gov/ics
www.us-cert.gov/ics
www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01
www.us-cert.gov/ics/Recommended-Practices
www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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mailto:?subject=Siemens%20SIMATIC%20PCS7%2C%20WinCC%2C%20TIA%20Portal%20%28Update%20D%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-134-08
9 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:S/C:C/I:C/A:C
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.001 Low
EPSS
Percentile
45.2%