-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
US-CERT Advisory (icsa-19-227-04) Siemens SINAMICS
14 November 2019
AusCERT Security Bulletin Summary
Product: Siemens SINAMICS products
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-6568
Comment: This advisory adds additional SINAMICS products to those affected
and initially published in ESB-2019.1204.
Revision History: November 14 2019: Updated recommendations from vendor
August 16 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-19-227-04)
Siemens SINAMICS (Update A)
Original release date: November 12, 2019
All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: SINAMICS
o Vulnerability: Uncontrolled Resource Consumption
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-19-227-04 Siemens SINAMICS that was published August 15, 2019, on the ICS
webpage on us-cert.gov.
3. RISK EVALUATION
Successful exploitation of this vulnerability may allow an attacker to perform
a denial-of-service attack.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
Siemens reports the vulnerability affects webservers of the following
o SINAMICS GH150 v4.7 (Control Unit): All versions
o SINAMICS GH150 v4.8 (Control Unit): All versions prior to v4.8 SP2 HF6
o SINAMICS GL150 v4.7 (Control Unit): All versions
o SINAMICS GL150 v4.8 (Control Unit): All versions prior to v4.8 SP2 HF7
o SINAMICS GM150 v4.7 (Control Unit): All versions
o SINAMICS GM150 v4.8 (Control Unit): All versions prior to v4.8 SP2 HF9
- --------- Begin Update A Part 1 of 2 ---------
o SINAMICS SL150 v4.7 (Control Unit): All versions prior to v4.7 HF33
- --------- End Update A Part 1 of 2 ---------
o SINAMICS SL150 v4.7 (Control Unit): All versions
o SINAMICS SL150 v4.8 (Control Unit): All versions
o SINAMICS SM120 v4.7 (Control Unit): All versions
o SINAMICS SM120 v4.8 (Control Unit): All versions
o SINAMICS SM150 v4.8 (Control Unit): All versions
4.2 VULNERABILITY OVERVIEW
4.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
The webserver of the affected devices contains a vulnerability that may lead to
a denial-of-service condition. An attacker may cause a denial-of-service
situation, leading to a restart of the webserver of the affected device. The
security vulnerability could be exploited by an attacker with network access to
the affected systems. Successful exploitation requires no system privileges and
no user interaction.
CVE-2019-6568 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Commercial Facilities, Critical
Manufacturing, Energy, Food and Agriculture, Healthcare and Public Health,
Transportation Systems, Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Siemens reported this vulnerability to CISA.
- --------- Begin Update A Part 2 of 2 ---------
Siemens currently recommends the following updates for the following products:
SINAMICS GH150 v4.7 (Control Unit), SINAMICS GH150 v4.8 (Control Unit, SINAMICS
GL150 v4.7 (Control Unit), SINAMICS GL150 v4.8 (Control Unit), SINAMICS GM150
v4.7 (Control Unit), and SINAMICS GM150 v4.8 (Control Unit)
o Update to v4.8 SP2 HF9
SINAMICS SL150 v4.7 (Control Unit)
o Update to v4.7 HF33
SINAMICS SM150 v4.8 (Control Unit)
o Upgrade to v5.1 SP2 HF3
- --------- End Update A Part 2 of 2 ---------
The update can be obtained from a Siemens representative or via Siemens
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Restrict network access to the integrated webserver.
o Deactivate the webserver if not required, and if deactivation is supported
by the product. For SINAMICS products, webserver may be deactivated with
parameter P8986 = 0
As a general security measure, Siemens strongly recommends users protect
network access to devices with appropriate mechanisms. In order to operate the
devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens' operational guidelines for industrial
security , and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at:
For more information on the vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-530931 at the following
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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 webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to email@example.com
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----