CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
58.3%
CVSS v3 4.2
**ATTENTION:**Exploitable remotely
**Vendor:**Siemens
Equipment: IEC 61850 system configurator, DIGSI 5, DIGSI 4, SICAM PAS/PQS, SICAM PQ Analyzer, and SICAM SCC
Vulnerability: Improper Access Control
Successful exploitation of this vulnerability could allow a remote attacker to exfiltrate limited data from the system or execute code with operating system user permissions.
The following versions of Siemens products are affected:
A service of the affected products listening on all of the hostβs network interfaces on either Port 4884/TCP, Port 5885/TCP, or Port 5886/TCP could allow an attacker to either exfiltrate limited data from the system or execute code with Microsoft Windows user permissions.
CVE-2018-4858 has been assigned to this vulnerability. A CVSS v3 base score of 4.2 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N).
Siemens ProductCERT reported this vulnerability to NCCIC.
Siemens has released updates for the affected products and recommends users update to the newest version.
<https://support.industry.siemens.com/cs/ww/en/view/109740546>
<https://support.industry.siemens.com/cs/ww/en/view/109758531>
<https://support.industry.siemens.com/cs/ww/en/view/109740980>
<https://support.industry.siemens.com/cs/us/en/view/109757831>
<https://support.industry.siemens.com/cs/us/en/view/109757833>
<https://support.industry.siemens.com/cs/ww/en/view/109745469>
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
<https://www.siemens.com/gridsecurity>
For additional information see Siemensβ security advisory SSA-159860 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.
NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target this vulnerability. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-4858
www.siemens.com/cert/en/cert-security-advisories.htm
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-317-01
cwe.mitre.org/data/definitions/284.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/us/en/view/109757831
support.industry.siemens.com/cs/us/en/view/109757833
support.industry.siemens.com/cs/ww/en/view/109740546
support.industry.siemens.com/cs/ww/en/view/109740980
support.industry.siemens.com/cs/ww/en/view/109745469
support.industry.siemens.com/cs/ww/en/view/109758531
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20IEC%2061850%20System%20Configurator%2C%20DIGSI%205%2C%20DIGSI%204%2C%20SICAM%20PAS/PQS%2C%20SICAM%20PQ%20Analyzer%2C%20and%20SICAM%20SCC+https://www.cisa.gov/news-events/ics-advisories/icsa-18-317-01
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:H/PR:N/UI:R/S:U/C:L/I:L/A:N
www.instagram.com/cisagov
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-18-317-01
www.oig.dhs.gov/
www.siemens.com/gridsecurity
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20IEC%2061850%20System%20Configurator%2C%20DIGSI%205%2C%20DIGSI%204%2C%20SICAM%20PAS/PQS%2C%20SICAM%20PQ%20Analyzer%2C%20and%20SICAM%20SCC&body=www.cisa.gov/news-events/ics-advisories/icsa-18-317-01
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
58.3%