7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
0.003 Low
EPSS
Percentile
64.5%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: Industrial products
Vulnerability: Improper Input Validation
This updated advisory is a follow-up to the updated advisory titled ICSA-17-339-01B Siemens Industrial Products that was published January 23, 2018, on the NCCIC/ICS-CERT web site.
--------- Begin Update C Part 1 of 2 --------
Siemens reports the vulnerability affects the following industrial products:
--------- End Update C Part 1 of 2 --------
Successful exploitation of this vulnerability may allow a remote attacker to conduct a denial-of-service (DoS) attack.
--------- Begin Update C Part 2 of 2 --------
Siemens has provided firmware updates for the following products to fix the vulnerability:
<https://support.industry.siemens.com/cs/cn/en/view/109749409>
<https://support.industry.siemens.com/cs/de/en/view/109474874>
<https://support.industry.siemens.com/cs/ww/en/view/109750012>
<https://support.industry.siemens.com/cs/ww/en/view/31045047>
<https://support.industry.siemens.com/cs/ww/en/view/31263919>
Please contact a Siemens representative for information on how to obtain the update.
<https://support.industry.siemens.com/cs/ww/en/view/109750507>
<https://support.industry.siemens.com/cs/us/en/ps/13717/dl>
<https://support.industry.siemens.com/cs/us/en/view/109478528>
<https://support.industry.siemens.com/cs/ww/en/view/109474550>
<https://support.industry.siemens.com/cs/ww/en/view/31045047>
<https://support.industry.siemens.com/cs/document/109474320>
<https://support.industry.siemens.com/cs/document/109740193>
<https://support.industry.siemens.com/cs/document/109746210>
<https://support.industry.siemens.com/cs/document/109752685>
For ET 200MP PN BA: Update to V4.0.2. For all ET 200MP devices: Follow recommendations from section Workaround and Mitigations.
<https://support.industry.siemens.com/cs/document/109754281>
--------- End Update C Part 2 of 2 ----------
Siemens is preparing further updates and recommends the following mitigations until patches are available:
Siemens recommends 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 the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-346262 at the following location:
<http://www.siemens.com/cert/advisories>
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 web site.
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.
Specially crafted packets sent to Port 161/UDP could cause a denial-of-service condition. The affected devices must be restarted manually.
CVE-2017-12741 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
George Lashenko of CyberX reported the vulnerability to Siemens.
**Critical Infrastructure Sectors:**Commercial Facilities, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
ics-cert.us-cert.gov
ics-cert.us-cert.gov
twitter.com/icscert
twitter.com/icscert
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12741
www.addthis.com/bookmark.php?url=https%3A%2F%2Fics-cert.us-cert.gov%2Fadvisories%2FICSA-17-339-01C
www.dhs.gov
www.dhs.gov/report-cyber-risks
www.siemens.com/cert/advisories
www.us-cert.gov/accessibility/
www.us-cert.gov/pdf/
www.us-cert.gov/privacy/
www.us-cert.gov/tlp/
www.us-cert.gov/tlp/
cwe.mitre.org/data/definitions/20.html
ics-cert.us-cert.gov/
ics-cert.us-cert.gov/content/recommended-practices
ics-cert.us-cert.gov/Report-Incident?
ics-cert.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
ics-cert.us-cert.gov/tips/ICS-TIP-12-146-01B
support.industry.siemens.com/cs/cn/en/view/109749409
support.industry.siemens.com/cs/de/en/view/109474874
support.industry.siemens.com/cs/document/109474320
support.industry.siemens.com/cs/document/109740193
support.industry.siemens.com/cs/document/109746210
support.industry.siemens.com/cs/document/109752685
support.industry.siemens.com/cs/document/109754281
support.industry.siemens.com/cs/us/en/ps/13717/dl
support.industry.siemens.com/cs/us/en/view/109478528
support.industry.siemens.com/cs/ww/en/view/109474550
support.industry.siemens.com/cs/ww/en/view/109750012
support.industry.siemens.com/cs/ww/en/view/109750507
support.industry.siemens.com/cs/ww/en/view/31045047
support.industry.siemens.com/cs/ww/en/view/31045047
support.industry.siemens.com/cs/ww/en/view/31263919
twitter.com/share?url=https%3A%2F%2Fics-cert.us-cert.gov%2Fadvisories%2FICSA-17-339-01C
www.facebook.com/sharer.php?u=https%3A%2F%2Fics-cert.us-cert.gov%2Fadvisories%2FICSA-17-339-01C
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
www.siemens.com/cert/operational-guidelines-industrial-security
www.us-cert.gov/forms/feedback?helpful=no&document=ICSA-17-339-01C Siemens Industrial Products (Update C)&trackingNumber=&url=https://ics-cert.us-cert.gov/advisories/ICSA-17-339-01C&site_name=ICS-CERT
www.us-cert.gov/forms/feedback?helpful=somewhat&document=ICSA-17-339-01C Siemens Industrial Products (Update C)&trackingNumber=&url=https://ics-cert.us-cert.gov/advisories/ICSA-17-339-01C&site_name=ICS-CERT
www.us-cert.gov/forms/feedback?helpful=yes&document=ICSA-17-339-01C Siemens Industrial Products (Update C)&trackingNumber=&url=https://ics-cert.us-cert.gov/advisories/ICSA-17-339-01C&site_name=ICS-CERT
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
0.003 Low
EPSS
Percentile
64.5%