ESB-2017.2954 - [Appliance] Siemens SICAM RTU: Multiple vulnerabilities 2017-11-17

Printable version
PGP/GPG verifiable version

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

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

                               ESB-2017.2954
         Multiple vulnerabilities have been identified in Siemens
                         SICAM RTUs Siemens SICAM
                             17 November 2017

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

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

Product:           Siemens SICAM RTU
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Cross-site Scripting            -- Remote with User Interaction
                   Access Confidential Data        -- Remote/Unauthenticated      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12739 CVE-2017-12738 CVE-2017-12737

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-320-02

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

Advisory (ICSA-17-320-02)

Siemens SICAM

Original release date: November 16, 2017

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/.

CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit. Public exploits 
are available.

Vendor: Siemens

Equipment: SICAM

Vulnerabilities: Missing Authentication for Critical Function, Cross-site 
Scripting, Code Injection

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following SICAM products:

SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00, 
ETA2, ETLS00, MODi00, DNPi00: All versions.

IMPACT

Successful exploitation of these vulnerabilities could allow an 
unauthenticated remote attacker to execute arbitrary code.

MITIGATION

As the web server is for diagnostics only and not required for normal 
operation, Siemens recommends disabling the web server after commissioning.

For users who are currently using the discontinued ETA2 (IEC 60870-5-104), 
MODi00 (Modbus/TCP slave) or DNPi00 (DNP3/TCP slave) firmware, Siemens 
recommends users upgrade to ETA4 (IEC 60870-5-104), MBSiA0 (Modbus/TCP slave)
or DNPiA1 (DNP3/ TCP slave) firmware, respectively, on the SM-2558 COM Module,
which is the successor to the SM-2556 Module. The upgrades are available at:

http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/substation-automation/substation-automation/Pages/sicam-ak-3.aspx
(link is external)

Siemens recommends users protect network access with appropriate mechanisms. 
Siemens also advises that users configure the operational environment 
according to Siemens Operational Guidelines for Industrial Security:

https://www.siemens.com/cert/operational-guidelines-industrial-security (link
is external)

For more information on these vulnerabilities and more detailed mitigation 
instructions, please see Siemens Security Advisory SSA-164516 at the following
location:

http://www.siemens.com/cert/advisories (link is external)

NCCIC/ICS-CERT recommends that 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.

ICS-CERT reminds organizations to perform proper impact analysis and risk 
assessment prior to deploying defensive measures.

ICS-CERT 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 ICS-CERT Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted 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 ICS-CERT for 
tracking and correlation against other incidents.

VULNERABILITY OVERVIEW

MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306

The integrated web server (Port 80/TCP) of the affected devices could allow 
unauthenticated remote attackers to obtain sensitive device information over 
the network.

CVE-2017-12737 has been assigned to this vulnerability. A CVSS v3 base score 
of 5.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE 
SCRIPTING') CWE-79

The integrated web server (Port 80/TCP) of the affected devices could allow 
cross-site scripting (XSS) attacks if unsuspecting users are tricked into 
clicking on a malicious link.

CVE-2017-12738 has been assigned to this vulnerability. A CVSS v3 base score 
of 6.1 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

IMPROPER CONTROL OF GENERATION OF CODE ('CODE INJECTION') CWE-94

The integrated web server (Port 80/TCP) of the affected devices could allow 
unauthenticated remote attackers to execute arbitrary code on the affected 
device.

CVE-2017-12739 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).

RESEARCHER

SEC Consult Vulnerability Lab reported these vulnerabilities directly to 
Siemens.

BACKGROUND

Critical Infrastructure Sectors: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

- --------------------------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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=KC9g
-----END PGP SIGNATURE-----

« Back to bulletins