ESB-2018.1413 - [Appliance] Siemens SINAMICS products: Denial of service - Remote/unauthenticated 2018-05-09

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1413
        Vulnerabilities in Siemens Medium Voltage SINAMICS Products
                                9 May 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens SINAMICS SIMOTIONS
                   Siemens SINAMICS PROFINET
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12741 CVE-2017-2680 

Reference:         ESB-2018.0246

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-128-01

- --------------------------BEGIN INCLUDED TEXT--------------------

Advisory (ICSA-18-128-01)

Siemens Medium Voltage SINAMICS Products

Original release date: May 08, 2018

Legal Notice

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

  * CVSS v3 7.5
  * ATTENTION: Exploitable remotely/low skill level to exploit
  * Vendor: Siemens
  * Equipment: Medium Voltage SINAMICS Products
  * Vulnerabilities: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could result in a
denial-of-service condition, resulting in a manual restart of the affected
devices.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that these vulnerabilities affect the following products:

  * SINAMICS GH150 V4.7 w. PROFINET: All versions prior to V4.7 SP5 HF7,
  * SINAMICS GL150 V4.7 w. PROFINET: All versions prior to V4.8 SP2,
  * SINAMICS GM150 V4.7 w. PROFINET: All versions prior to V4.8 SP2,
  * SINAMICS SL150 V4.7.0 w. PROFINET: All versions prior to V4.7 HF30,
  * SINAMICS SL150 V4.7.4 w. PROFINET: All versions prior to V4.8 SP2,
  * SINAMICS SL150 V4.7.5 w. PROFINET: All versions prior to V4.8 SP2,
  * SINAMICS SM120 V4.7 w. PROFINET: All versions prior to V4.8 SP2, and
  * SINAMICS SM150 V4.7 w. SIMOTION and PROFINET: All versions.

3.2 VULNERABILITY OVERVIEW

3.2.1   IMPROPER INPUT VALIDATION CWE-20

Specially crafted packets sent to Port 161/UDP could cause a denial-of-service
condition. The affected devices must be restarted manually.

CVE-2017-12741 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/C:N
/I:N/A:H).

3.2.2   IMPROPER INPUT VALIDATION CWE-20

Specially crafted PROFINET DCP broadcast packets could cause a
denial-of-service condition of affected products on a local Ethernet segment
(Layer 2). Human interaction is required to recover the systems. PROFIBUS
interfaces are not affected.

CVE-2017-2680 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N
/I:N/A:H).

3.3 BACKGROUND

  * Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Energy,
    Food and Agriculture, Water and Wastewater Systems
  * Countries/Areas Deployed: Worldwide
  * Company Headquarters Location: Germany

3.4 RESEARCHER

Siemens ProductCERT reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Siemens recommends users implement the following updates. These updates can be
obtained from a Siemens representative or via Siemens customer service.

  * SINAMICS GH150 V4.7 w. PROFINET: Update to V4.7 SP5 HF7 or upgrade to V4.8
    SP2,
  * SINAMICS GL150 V4.7 w. PROFINET: Upgrade to V4.8 SP2,
  * SINAMICS GM150 V4.7 w. PROFINET: Upgrade to V4.8 SP2,
  * SINAMICS SL150 V4.7.0 w. PROFINET: Update to V4.7 HF30 or upgrade to V4.8
    SP2,
  * SINAMICS SL150 V4.7.4 w. PROFINET: Upgrade to V4.8 SP2,
  * SINAMICS SL150 V4.7.5 w. PROFINET: Upgrade to V4.8 SP2, and
  * SINAMICS SM120 V4.7 w. PROFINET: Upgrade to V4.8 SP2

Siemens has identified the following specific workarounds and mitigations users
can apply for SINAMICS SM150 V4.7 w. SIMOTION and PROFINET: All versions, to
reduce the risk:

  * Apply cell protection concept and implement Defense-in-Depth.
  * Protect network access to Port 161/UDP of affected devices.
  * Use VPN for protecting network communication between cells.

As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to Siemens? operational guidelines for Industrial

Security (Download: https://www.siemens.com/cert/
operational-guidelines-industrial-security), and following the recommendations
in the product manuals. Additional information on Industrial Security by
Siemens can be found at: https://www.siemens.com/industrialsecurity

For more information on these vulnerabilities and associated mitigation
practices, please see Siemens security advisory SSA-546832 on their website:

https://www.siemens.com/cert/advisories

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:

  * Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
  * Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  * 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.

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-12-146-01B--Targeted 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.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://
ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident

- --------------------------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 auscert@auscert.org.au
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:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=++Zu
-----END PGP SIGNATURE-----

« Back to bulletins