4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
4.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
0.003 Low
EPSS
Percentile
69.3%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: SIMATIC WinCC and SIMATIC WinCC Runtime Professional
Vulnerability: Denial of Service
Siemens reports that the vulnerability affects the following versions of SIMATIC WinCC, SIMATIC WinCC (TIA Portal), and SIMATIC WinCC Runtime Professional:
Successful exploitation of this vulnerability under certain circumstances may allow the attacker to cause the affected service to crash, resulting in a denial-of-service condition.
Siemens has released updates for the following products and strongly encourages users to upgrade to the new versions as soon as possible:
<https://support.industry.siemens.com/cs/ww/en/view/109746452>
<https://support.industry.siemens.com/cs/ww/en/view/109746038>
<https://support.industry.siemens.com/cs/ww/en/view/109746268>
<https://support.industry.siemens.com/cs/ww/en/view/109746276>
<https://support.industry.siemens.com/cs/ww/en/view/109746075>
<https://support.industry.siemens.com/cs/ww/en/view/109746074>
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-156872 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
As a general security measure Siemens strongly recommends protecting network access to SIMATIC WinCC, SIMATIC WinCC Runtime, and SIMATIC WinCC (TIA Portal) Professional stations with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.
<https://www.siemens.com/cert/operational-guidelines-industrial-security>
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. 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. 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 ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
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.
No known public exploits specifically target this vulnerability.
An authenticated, remote attacker who is a member of the βadministratorsβ group could crash services by sending specially crafted messages to the DCOM interface.
CVE-2017-6867 has been assigned to this vulnerability. A CVSS v3 base score of 4.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
Sergey Temnikov and Vladimir Dashchenko of the Kaspersky Lab Critical Infrastructure Defense Team reported this vulnerability directly to Siemens.
**Critical Infrastructure Sectors:**Food and Agriculture, Chemical, Energy, Water and Wastewater Systems
**Countries/Areas Deployed:**Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-6867
www.siemens.com/cert/en/cert-security-advisories.htm
cwe.mitre.org/data/definitions/20.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109746038
support.industry.siemens.com/cs/ww/en/view/109746074
support.industry.siemens.com/cs/ww/en/view/109746075
support.industry.siemens.com/cs/ww/en/view/109746268
support.industry.siemens.com/cs/ww/en/view/109746276
support.industry.siemens.com/cs/ww/en/view/109746452
twitter.com/CISAgov
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www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
www.instagram.com/cisagov
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-17-129-03
www.oig.dhs.gov/
www.siemens.com/cert/operational-guidelines-industrial-security
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-17-129-03
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20SIMATIC%20WinCC%20and%20SIMATIC%20WinCC%20Runtime%20Professional&body=www.cisa.gov/news-events/ics-advisories/icsa-17-129-03
4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
4.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
0.003 Low
EPSS
Percentile
69.3%