7.8 High
CVSS2
Attack Vector
NETWORK
Attack 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
6.5 Medium
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.003 Low
EPSS
Percentile
68.2%
CVSS v3 7.5
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Siemens
Equipment: Medium Voltage SINAMICS Products
Vulnerabilities: Improper Input Validation
This updated advisory is a follow-up to the original advisory titled ICSA-18-128-01 Siemens Medium Voltage SINAMICS Products that was published May 10, 2018, on the NCCIC/ICS-CERT website.
Successful exploitation of these vulnerabilities could result in a denial-of-service condition, resulting in a manual restart of the affected devices.
Siemens reports that these vulnerabilities affect the following products:
--------- Begin Update A Part 1 of 2 --------
--------- End Update A Part 1 of 2 --------
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 calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Specially crafted PROFINET DCP broadcast packets could cause a denial-of-service condition of affected products on a local Ethernet segment (Layer 2). Human interaction is required to recover the systems. PROFIBUS interfaces are not affected.
CVE-2017-2680 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Siemens ProductCERT reported these vulnerabilities to NCCIC.
Siemens recommends users implement the following updates. These updates can be obtained from a Siemens representative or via Siemens customer service.
--------- Begin Update A Part 2 of 2 --------
--------- End Update A Part 2 of 2 --------
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 configuring the environment according to Siemensβ operational guidelines for Industrial Security (Download: <https://www.siemens.com/cert/operational-guidelines-industrial-security>), and following 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 associated mitigation practices, please see Siemens security advisory SSA-546832 on their website:
<https://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 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 these vulnerabilities.
cwe.mitre.org/data/definitions/19.html
cwe.mitre.org/data/definitions/20.html
nvd.nist.gov/vuln/detail/CVE-2017-12741
nvd.nist.gov/vuln/detail/CVE-2017-2680
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7.8 High
CVSS2
Attack Vector
NETWORK
Attack 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
6.5 Medium
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.003 Low
EPSS
Percentile
68.2%