CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
97.1%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: SIPROTEC 4 and SIPROTEC Compact
Vulnerabilities: Improper Input Validation, Missing Authorization, Improper Authentication
This updated advisory is a follow-up to the updated advisory titled ICSA-17-187-03E Siemens SIPROTEC 4 and SIPROTEC Compact that was published January 4, 2018, on the NCCIC/ICS-CERT website.
Siemens reports that the vulnerabilities affect the following SIPROTEC 4 and SIPROTEC Compact protection, control, measurement, and automation devices:
--------- Begin Update F Part 1 of 2 --------
Please note that not all of the devices above are affected by all of these vulnerabilities. Please see Siemens Security Advisory SSA-323211 for more detailed information.
--------- End Update F Part 1 of 2 ----------
Successful exploitation of these vulnerabilities could cause a denial-of-service condition, allow an attacker access to sensitive information, or allow an attacker to perform administrative functions.
--------- Begin Update F Part 2 of 2 --------
Siemens provides updates for the following affected products and recommends users update to the latest version:
<https://support.industry.siemens.com/cs/us/en/view/109745821>
<https://support.industry.siemens.com/cs/gb/en/view/109743555>
<http://www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=51>
<http://www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=68>
<http://www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=64>
--------- End Update F Part 2 of 2 ----------
Siemens is preparing updates for the remaining affected products and recommends the following mitigations in the meantime:
Please see the specific product manual for more information. Manuals can be obtained from the downloads menu at the following Siemens website:
<http://www.siemens.com/gridsecurity>
Siemens recommends users protect network access with appropriate mechanisms such as firewalls, segmentation, and VPNs. Siemens also advises that users configure the operational environment according to Siemensβ Operational Guidelines for Industrial Security:
<https://www.siemens.com/cert/operational-guidelines-industrial-security>
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-323211 at the following location:
<http://www.siemens.com/cert/advisories>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.
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.
In addition, NCCIC recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
Specially crafted packets sent to Port 50000/UDP could cause a denial of service of the affected device. A manual reboot may be required to recover the service of the device.
CVE-2015-5374 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain sensitive device information if network access was obtained.
CVE-2016-4784 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain a limited amount of device memory content if network access was obtained.
CVE-2016-4785 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Attackers with network access to the deviceβs web interface (Port 80/TCP) could circumvent authentication and perform certain administrative operations.
CVE-2016-7112 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Specially crafted packets sent to Port 80/TCP could cause the affected device to go into defect mode.
CVE-2016-7113 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).
Attackers with network access to the deviceβs web interface (Port 80/TCP) could circumvent authentication and perform certain administrative operations. A legitimate user must be logged into the web interface for the attack to be successful.
CVE-2016-7114 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
Siemens reported these vulnerabilities to NCCIC when they made firmware available to fix them.
Critical Infrastructure Sector: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5374
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4784
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4785
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7112
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7113
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7114
www.siemens.com/cert/advisories
www.siemens.com/gridsecurity
www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=51
www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=64
www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=68
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-17-187-03f
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cwe.mitre.org/data/definitions/862.html
cwe.mitre.org/data/definitions/862.html
cwe.mitre.org/data/definitions/862.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/gb/en/view/109743555
support.industry.siemens.com/cs/us/en/view/109745821
twitter.com/CISAgov
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www.siemens.com/cert/pool/cert/siemens_security_advisory_SSA-323211.pdf
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
97.1%