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Schneider Electric has an upgrade to fix an out-of-bounds write vulnerability in its Interactive Graphical SCADA System (IGSS), according to a report with NCCIC.

Successful exploitation of this vulnerability could allow an attacker to achieve arbitrary code execution or crash the software.

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IGSS Version 14 and prior suffer from the vulnerability, discovered by mdm and rgod of 9SG Security Team working with Trend Micro Zero Day Initiative.

An out-of-bounds vulnerability exists and could be exploited by the application processing a specially crafted project file. Exploitation could cause a software crash when data in the mdb database is manipulated or allow code execution.

Schneider Bold

CVE-2019-6827 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 7.0.

The product sees use in the commercial facilities, critical manufacturing, and energy sectors. It also sees action on a global basis.

No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. High skill level is needed to exploit.

Schneider Electric recommends upgrading to Version or

The following workarounds and mitigations can be applied by users to reduce the risk:
• Do not allow untrusted access to the configuration database (mdb) and update IGSS to the latest version of IGSS, either Version 13 or Version 14
• A restart of the software is required, but a reboot of the system is not required

Schneider Electric general security recommendations:
• Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network.
• Physical controls should be in place so no unauthorized person would have access to the ICS and safety controllers, peripheral equipment, or the ICS and safety networks.
• All controllers should reside in locked cabinets and never be left in “Program” mode.
• All programming software should be kept in locked cabinets and should never be connected to any network other than the network intended for the devices.
• All methods of mobile data exchange with the isolated network, such as CDs, USB drives, etc., should be scanned before use in the terminals or any node connected to these networks.
• Laptops that have connected to any other network besides the intended network should never be allowed to connect to the safety or control networks without proper sanitation.
• Minimize network exposure for all control system devices and/or systems and ensure that they are not accessible from the Internet.
• 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.

For more information, click on the Schneider Electric advisory.

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