CVSS2
Attack Vector
NETWORK
Attack 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
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
53.9%
CVSS v3 9.0
ATTENTION: Remotely exploitable/low skill level to exploit
Vendor: Siemens
Equipment: SIMATIC
Vulnerability: Improper Authentication
This updated advisory is a follow-up to the updated advisory titled ICSA-17-045-03C Siemens SIMATIC Authentication Bypass that was published November 30, 2017, on the NCCIC/ICS-CERT website.
Successful exploitation of this vulnerability could allow attackers to circumvent user authentication under certain conditions.
--------- Begin Update D Part 1 of 1 --------
Siemens reports this vulnerability affects the following software applications used for central user administration:
The following products include affected versions of SIMATIC Logon:
--------- End Update D Part 1 of 1 ----------
An attacker with knowledge of a valid user name, and physical or network access to the affected system could bypass the application-level authentication.
CVE-2017-2684 has been assigned to this vulnerability. A CVSS v3 base score of 9.0 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H).
Siemens reported this vulnerability to ICS-CERT.
Siemens provides SIMATIC Logon v1.5 SP3 Update 2 and recommends that users update to the new version. Users using recent versions of SIMATIC WinCC, SIMATIC PCS 7, SIMATIC IT, SIMATIC IT Production Suite, or SIMATIC PDM can install the new version of SIMATIC Logon without an update of these products as described in the compatibility note that can be accessed via the download link below:
<https://support.industry.siemens.com/cs/ww/en/view/109744966>
For more information on this vulnerability and more detailed mitigation instructions, see Siemens Security Advisory SSA-931064 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
As a general security measure Siemens strongly recommends configuring the environment according to Siemensβ operational guidelines in order to run the devices in a protected IT environment.
<https://www.siemens.com/cert/operational-guidelines-industrial-security>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC 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 on the ICS-CERT website 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 NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-2684
www.siemens.com/cert/en/cert-security-advisories.htm
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-17-045-03
cwe.mitre.org/data/definitions/287.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109744966
twitter.com/CISAgov
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-17-045-03
www.oig.dhs.gov/
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www.whitehouse.gov/
www.youtube.com/@cisagov
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CVSS2
Attack Vector
NETWORK
Attack 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
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
53.9%