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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
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Schneider Electric ClearSCADA
Original release date: March 09, 2017
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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
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