10 High
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
9.8 High
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 High
AI Score
Confidence
High
0.005 Low
EPSS
Percentile
75.3%
CVSS v3 9.8
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Siemens
Equipment: Desigo PXC
Vulnerability: Improper Authentication
This updated advisory is a follow-up to the advisory update titled ICSA-18-025-02B Siemens Desigo PXC that was published March 22, 2018, on the NCCIC/ICS-CERT website.
Successful exploitation of this vulnerability could allow unauthenticated remote attackers to upload malicious firmware without prior authentication.
This advisory covers only the Desigo PX Controller product line and not the Apogee PX Controller product line.
--------- Begin Update C Part 1 of 2 ---------
Siemens reports that the vulnerability affects all versions prior to v4.10.111, v5.00.171, v5.10.069, and v6.00.204 of the following products:
--------- End Update C Part 1 of 2 ---------
4.2.1 IMPROPER AUTHENTICATION CWE-287
A remote attacker with network access to the device could potentially upload a new firmware image to the devices without prior authentication.
CVE-2018-4834 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Can Demirel and Melih Berk Eksioglu from Biznet Bilisim reported this vulnerability to Siemens.
--------- Begin Update C Part 2 of 2 ---------
Siemens has provided updated versions that fix the vulnerability for the affected products. Siemens recommends users update to version v4.10.111, v5.00.171, v5.10.069, or v6.00.204 or later. Updates can be obtained from Siemens customer support or a local partner.
--------- End Update C Part 2 of 2 ----------
As a general security measure, Siemens strongly recommends protecting network access to the devices with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.
<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-824231 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 this vulnerability. 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-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-4834
www.siemens.com/cert/en/cert-security-advisories.htm
cwe.mitre.org/data/definitions/287.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20Desigo%20PXC%20%28Update%20C%29+https://www.cisa.gov/news-events/ics-advisories/icsa-18-025-02b
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-18-025-02b&title=Siemens%20Desigo%20PXC%20%28Update%20C%29
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-18-025-02b
www.oig.dhs.gov/
www.siemens.com/cert/operational-guidelines-industrial-security
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-025-02b
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20Desigo%20PXC%20%28Update%20C%29&body=www.cisa.gov/news-events/ics-advisories/icsa-18-025-02b
10 High
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
9.8 High
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 High
AI Score
Confidence
High
0.005 Low
EPSS
Percentile
75.3%