CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
65.0%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: TeleControl Server Basic
Vulnerabilities: Authentication Bypass Using an Alternate Path or Channel, Permissions, Privileges, and Access Controls, Resource Exhaustion
The following versions of TeleControl Server Basic, a monitoring platform, are affected:
Successful exploitation of these vulnerabilities could allow for escalation of privileges to perform administrative actions.
Siemens recommends that users install the latest version of TeleControl Server Basic which can be found at:
<https://support.industry.siemens.com/cs/ww/en/view/109755199>
Siemens has also identified other mitigations that affected users can take:
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-65145 at the following location:
http://www.siemens.com/cert/en/cert-security-advisories.htm (link is external)
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-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
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.
An attacker with network access to Port 8000/TCP could bypass the authentication mechanism gaining access to limited information.
CVE-2018-4835 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
An authenticated attacker with network access to Port 8000/TCP could escalate privileges and perform administrative operations.
CVE-2018-4836 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
An attacker with access to the TeleControl Server Basicβs webserver (Ports 80/TCP or 443/TCP) could cause a Denial-of-Service condition on the web server. The remaining functionality of the TeleControl Server Basic is not affected by the Denial-of-Service condition.
CVE-2018-4837 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
Siemens ProductCERT reported the vulnerabilities to NCCIC.
Critical Infrastructure Sector: Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-4835
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-4836
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-4837
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-18-030-02
cwe.mitre.org/data/definitions/264.html
cwe.mitre.org/data/definitions/288.html
cwe.mitre.org/data/definitions/400.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109755199
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20TeleControl%20Server%20Basic+https://www.cisa.gov/news-events/ics-advisories/icsa-18-030-02
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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%20TeleControl%20Server%20Basic&body=www.cisa.gov/news-events/ics-advisories/icsa-18-030-02
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
65.0%