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
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
8.1 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
64.4%
CVSS v3 7.5
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Siemens
Equipment: EN100 Ethernet module
Vulnerabilities: Improper Input Validation
The EN100 Ethernet module for the SWT 3000 management platform is affected by security vulnerabilities that could allow an attacker to conduct a denial-of-service attack over the network.
The following versions of EN100 Ethernet module, a communication module for SWT 3000 management platform, are affected:
3.2.1 IMPROPER INPUT VALIDATION CWE-20
Specially crafted packets to Port 102/TCP could cause a denial-of-service condition in the affected products. A manual restart is required to recover the EN100 module functionality of the affected devices.
CVE-2018-11451 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).
3.2.2 IMPROPER INPUT VALIDATION CWE-20
Specially crafted packets to Port 102/TCP could cause a denial-of-service condition in the EN100 module if oscillographs are running. A manual restart is required to recover the EN100 module functionality.
CVE-2018-11452 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Victor Nikitin, Vladislav Suchkov, and Ilya Karpov from ScadaX reported these vulnerabilities to Siemens.
Siemens has released update v4.33 for several affected products, is working on updates for the remaining affected products, and recommends specific countermeasures until fixes are available:
<https://support.industry.siemens.com/cs/us/en/view/109745821>
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
For additional information see Siemensβ security advisory SSA-325546 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-12-146-01BβTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-11451
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-11452
www.siemens.com/cert/en/cert-security-advisories.htm
cwe.mitre.org/data/definitions/20.html
cwe.mitre.org/data/definitions/20.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/us/en/view/109745821
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20EN100%20Ethernet%20Module+https://www.cisa.gov/news-events/ics-advisories/icsa-19-038-02
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-19-038-02&title=Siemens%20EN100%20Ethernet%20Module
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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.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-19-038-02
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-038-02
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20EN100%20Ethernet%20Module&body=www.cisa.gov/news-events/ics-advisories/icsa-19-038-02
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
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
8.1 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
64.4%