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
0.004 Low
EPSS
Percentile
72.6%
**ATTENTION:**Exploitable remotely/low skill level to exploit.
Vendor: Siemens
Equipment: TIM 1531 IRC
Vulnerability: Missing Authentication for Critical Function
Siemens reports that the vulnerability affects the following TIM 1531 IRC communications modules:
Successful exploitation may cause the device to enter a denial-of-service condition, or allow the attacker to read and manipulate data and configuration settings of the affected device.
Siemens recommends updating to version 1.1 as soon as possible. The update can be found at the following location on the Siemens website:
<https://support.industry.siemens.com/cs/ww/en/view/109755374>
Siemens has identified the following specific workaround and mitigation that users can apply to reduce the risk:
Siemens recommends users protect network access with appropriate mechanisms. Siemens also advises that users follow recommendations in the product manuals and configure the operational environment according to Siemensβ Operational Guidelines for Industrial Security:
<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-110922 at the following location:
<http://www.siemens.com/cert/advisories>
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 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 website.
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.
A remote attacker with network access to Port 80/TCP or Port 443/TCP could perform administrative operations on the device without prior authentication.
CVE-2018-4841 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Siemens reported this vulnerability to NCCIC.
Critical Infrastructure Sectors: Chemical, Critical Manufacturing, and Food and Agriculture
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-4841
www.siemens.com/cert/advisories
cwe.mitre.org/data/definitions/303.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109755374
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20TIM%201531%20IRC+https://www.cisa.gov/news-events/ics-advisories/icsa-18-088-02
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-18-088-02&title=Siemens%20TIM%201531%20IRC
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-18-088-02
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-18-088-02
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20TIM%201531%20IRC&body=www.cisa.gov/news-events/ics-advisories/icsa-18-088-02
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
0.004 Low
EPSS
Percentile
72.6%