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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
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-6021  

Original Bulletin: 

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Advisory (ICSA-17-068-01)

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

Equipment: ClearSCADA

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 
Notification at:

http://www.schneider-electric.com/en/download/document/SEVD-2017-060-01/ (link
is external)

Schneider Electric recommends users include the following measures in their 
SCADA strategies:

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 
accessible networks.

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.



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 
Schneider Electric.


Critical Infrastructure Sector(s): Critical Manufacturing

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Paris, France

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