-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
Schneider Electric ClearSCADA Improper Input Validation
13 March 2017
AusCERT Security Bulletin Summary
Product: Schneider Electric ClearSCADA
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2017-6021
- --------------------------BEGIN INCLUDED TEXT--------------------
Schneider Electric ClearSCADA
Original release date: March 09, 2017
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 7.5
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Schneider Electric
Vulnerability: Improper Input Validation
The following versions of ClearSCADA, server and communications driver
processes, are affected:
All supported versions including:
ClearSCADA 2014 R1 (build 75.5210) and prior,
ClearSCADA 2014 R1.1 (build 75.5387) and prior,
ClearSCADA 2015 R1 (build 76.5648) and prior,
ClearSCADA 2015 R2 (build 77.5882) and prior.
Successful exploitation of this vulnerability could cause the ClearSCADA
server process and communications driver processes to terminate.
Schneider Electric has released the following updates to mitigate the
ClearSCADA 2014 R1.1 hotfix build 75.6239
ClearSCADA 2015 R1.1 Service Pack (build 76.6191)
ClearSCADA 2015 R2 hotfix build 77.6181
Users of ClearSCADA 2013 R2 and prior versions should upgrade to the latest
ClearSCADA 2015 R2 hotfix to mitigate the vulnerability.
Each of the Service Pack and hotfixes above are available for direct download
from Schneider Electrics web site at:
(link is external)
More information can be found by visiting Schneider Electrics Security
Schneider Electric recommends users include the following measures in their
Secure physical and network interfaces to the ClearSCADA system.
Deploy suitably configured firewalls between network segments to limit
access to ports and protocols appropriately.
Deploy VPN technology with secure authentication on any externally
Configure and audit user security to reduce the risk of a denial of
For critical accounts use ClearSCADA security policy configuration to
disable invalid logon count and delayed lockout time and to use logon
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 ICSCERT 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.
No known public exploits specifically target this vulnerability.
IMPROPER INPUT VALIDATION CWE-20
An attacker with network access to the ClearSCADA server can send specially
crafted sequences of commands and data packets to the ClearSCADA server that
can cause the ClearSCADA server process and ClearSCADA communications driver
processes to terminate.
CVE-2017-6021 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is
Sergey Temnikov and Vladimir Dashchenko of Kapersky Labs Critical
Infrastructure Defense Team identified and reported the vulnerability to
Critical Infrastructure Sector(s): Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Paris, France
- --------------------------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 firstname.lastname@example.org
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: email@example.com
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-----