5.8 Medium
CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:A/AC:L/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.001 Low
EPSS
Percentile
50.7%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: Ruggedcom ROS, SCALANCE
Vulnerability: Improper Access Control
This updated advisory is a follow-up to the updated advisory titled ICSA-17-271-01A Siemens Ruggedcom ROS, SCALANCE that was published October 10, 2017, on the NCCIC/ICS-CERT website.
--------- Begin Update B Part 1 of 2 --------
Siemens reports that the vulnerability affects the following devices using the Ruggedcom Discovery Protocol (RCDP):
--------- End Update B Part 1 of 2 ----------
Successful exploitation of this vulnerability could allow users of networks adjacent to the targeted device to perform unauthorized administrative actions.
--------- Begin Update B Part 2 of 2 --------
Siemens provides new versions to mitigate this vulnerability and recommends users update to the newest version.
The firmware updates for the Ruggedcom ROS-based devices can be obtained by contacting the Ruggedcom support team at:
<https://support.industry.siemens.com/my/us/en/requests>
<https://support.industry.siemens.com/cs/de/en/view/109754174>
<https://support.industry.siemens.com/cs/ww/de/view/109755475>
--------- End Update B Part 2 of 2 ----------
Siemens is preparing updates for the remaining affected products and recommends that users manually deactivate RCDP according to the instructions in the user guide. The user guide can be found on the Siemens web site at the following location:
<https://support.industry.siemens.com/cs/ww/en/view/109748693>
As a general security measure, Siemens advises configuring the IT environment according to Siemens operational guidelines in order to run the devices in a protected manner.
<https://www.siemens.com/cert/operational-guidelines-industrial-security>
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-856721 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
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-12-146-01B–Targeted 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.
No known public exploits specifically target this vulnerability.
After initial configuration, the RCDP is still able to write to the device under certain conditions, potentially allowing users located in the adjacent network of the targeted device to perform unauthorized administrative actions.
CVE-2017-12736 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Siemens reported this vulnerability to NCCIC.
Critical Infrastructure Sectors: Energy, Healthcare and Public Health, and Transportation Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12736
www.siemens.com/cert/en/cert-security-advisories.htm
cwe.mitre.org/data/definitions/284.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/de/en/view/109754174
support.industry.siemens.com/cs/ww/de/view/109755475
support.industry.siemens.com/cs/ww/en/view/109748693
support.industry.siemens.com/my/us/en/requests
twitter.com/CISAgov
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5.8 Medium
CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:A/AC:L/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.001 Low
EPSS
Percentile
50.7%