CVE-2019-6833 : Security Advisory and Response

A vulnerability exists in various versions of Magelis HMI Panels, potentially causing temporary freezing when receiving a high rate of frames.

Understanding CVE-2019-6833

What is CVE-2019-6833?

This CVE refers to a CWE-754 vulnerability in Magelis HMI Panels, leading to temporary freezing if a large number of frames are received.

The Impact of CVE-2019-6833

The vulnerability can result in a temporary freeze of the HMI panel when a high rate of frames is received. Once the attack ceases, the buffered commands are processed.

Technical Details of CVE-2019-6833

Vulnerability Description

The vulnerability is categorized as CWE-754 - Improper Check for Unusual or Exceptional Conditions in various versions of Magelis HMI Panels.

Affected Systems and Versions

Product: Magelis HMI Panels
Vendor: Schneider Electric SE
Affected Versions: All versions of HMIGTO, HMISTO, XBTGH, HMIGTU, HMIGTUX, HMISCU, HMISTU, XBTGT, HMIGXO, HMIGXU

Exploitation Mechanism

The vulnerability can be exploited by sending a large number of frames to the HMI panel, causing it to temporarily freeze.

Mitigation and Prevention

Immediate Steps to Take

Monitor network traffic for any unusual activity or a high rate of frames being received.
Implement network segmentation to isolate critical systems from potentially compromised devices.
Apply vendor-supplied patches or updates to address the vulnerability.

Long-Term Security Practices

Regularly update and patch all software and firmware to mitigate potential vulnerabilities.
Conduct regular security assessments and penetration testing to identify and address any security gaps.

Patching and Updates

Schneider Electric SE has provided patches to address the vulnerability. Ensure all affected systems are updated with the latest patches.