5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.2 High
AI Score
Confidence
High
0.01 Low
EPSS
Percentile
83.6%
This updated advisory is a follow-up to the original advisory titled ICSA-17-285-05 Siemens BACnet Field Panels that was published October 12, 2017, on the ICS webpage on cisa.gov/ics.
Successful exploitation of these vulnerabilities could allow unauthenticated attackers with access to the integrated webserver to download sensitive information.
Siemens reports that the vulnerabilities affect the following BACnet field panels:
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An attacker with network access to the integrated web server (Ports 80/TCP and 443/TCP) could bypass the authentication and download sensitive information from the device.
CVE-2017-9946 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:H/I:N/A:N).
A directory traversal vulnerability could allow a remote attacker with network access to the integrated web server (Ports 80/TCP and 443/TCP) to obtain information on the structure of the file system of the affected devices.
CVE-2017-9947 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).
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RoseSecurity reported the vulnerabilities for APOGEE PXC Series (P2 Ethernet) devices to Siemens.
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Siemens has released updates for several affected products and recommends updating to the latest versions. Siemens recommends countermeasures for products where updates are not, or not yet available.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
As a general security measure Siemens strongly recommends protecting network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.
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For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-148078
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics 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 webpage on cisa.gov/ics in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-9946
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-9947
www.siemens.com/cert/en/cert-security-advisories.htm
cisa.gov/ics
cisa.gov/ics
cwe.mitre.org/data/definitions/22.html
cwe.mitre.org/data/definitions/288.html
partnerportal.extranet.dc.siemens.com/
partnerportal.extranet.dc.siemens.com/
partnerportal.extranet.dc.siemens.com/
partnerportal.extranet.dc.siemens.com/
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
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www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/recommended-practices
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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mailto:?subject=Siemens%20BACnet%20Field%20Panels%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-17-285-05
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.2 High
AI Score
Confidence
High
0.01 Low
EPSS
Percentile
83.6%