Schneider Working to Mitigate HMI Holes

Thursday, November 3, 2016 @ 06:11 PM gHale


Schneider Electric is planning to release new versions to mitigate resource consumption vulnerabilities affecting its Magelis human-machine interface (HMI) products, according to a report with ICS-CERT.

These vulnerabilities, discovered by researcher Eran Goldstein in collaboration with Check Point Software Technologies and CRITIFENCE, are remotely exploitable.

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Detailed vulnerability information is publicly available that could end up used to develop an exploit that targets these vulnerabilities.

Schneider Electric reports the vulnerabilities affect the following versions of Magelis HMI:
• Magelis GTO Advanced Optimum Panels, all versions
• Magelis GTU Universal Panel, all versions
• Magelis STO5xx and STU Small panels, all versions
• Magelis XBT GH Advanced Hand-held Panels, all versions
• Magelis XBT GK Advanced Touchscreen Panels with Keyboard, all versions
• Magelis XBT GT Advanced Touchscreen Panels, all versions
• Magelis XBT GTW Advanced Open Touchscreen Panels (Windows XPe)

Successful exploitation of these vulnerabilities could result in a denial of service for the affected devices.

Schneider Electric’s corporate headquarters is located in Paris, France, and maintains offices in more than 100 countries worldwide.

The affected products, Magelis, are human-machine interfaces. According to Schneider Electric, the Magelis HMIs see action across several sectors including critical manufacturing, and Food and Agriculture. Schneider said these products see use on a global basis.

An attacker can open multiple connections to a targeted web server and keep connections open preventing new connections from being made, rendering the web server unavailable during an attack.

CVE-2016-8367 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 5.3.

In addition, an attacker may be able to disrupt a targeted web server, resulting in a denial of service. The disruption requires the affected device to end up rebooted in order to regain operation.

CVE-2016-8374 is the case number assigned to this vulnerability, which has a v3 base score of 7.5.

Detailed vulnerability information is publicly available that could end up used to develop an exploit that targets these vulnerabilities. An attacker with low skill would be able to exploit these vulnerabilities.

Schneider Electric is working to release new versions for the affected products that mitigate the identified vulnerabilities by the end of March 2017.

Schneider Electric recommends users apply the following measures to minimize potential exposure:
• Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet
• Minimize potential attack surface by leaving the Web Gate Server set to its default disabled state if it is not needed
• Place control system networks and devices behind firewalls, and isolate them from the business network
• Limit traffic on the local network with managed switches
• Where possible, avoid Wi-Fi capabilities; but when Wi-Fi is essential, use only secure communications (such as WPA2 encryption)
• Do not grant access to unknown computers
• When remote access is essential, use secure methods, such as Virtual Private Networks (VPNs); and ensure the remote access solution(s), as well as the remote computer(s), are kept up-to-date with the latest security patches.

For further information on vulnerabilities, click on the Schneider Electric cybersecurity web page.



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