Beware of Buffer Overflow Vulnerability in Weintek cMT3000 HMI Devices

CVSScvssV3_1: 9.8

The Weintek cMT3000 HMI devices are industrial human-machine interfaces (HMIs) used for monitoring and controlling industrial equipment and processes. Security researchers have discovered a stack-based buffer overflow vulnerability in the codesys.cgi script used in these devices.

A buffer overflow occurs when a program or process tries to store more data in a buffer (temporary data storage area) than it was intended to hold. This can overwrite adjacent memory and corrupt the normal flow of execution. In this case, the codesys.cgi script does not properly check the length of input passed to it, allowing an attacker to craft a long request that overflows the buffer.

An attacker could exploit this to execute arbitrary code on the device with the privileges of the CGI process. As the CGI runs with higher privileges, this would allow bypassing authentication and taking full control of the HMI remotely without any credentials. With access to the HMI, an attacker could then monitor or disrupt the industrial processes connected to it.

Weintek users should update their cMT3000 devices to the latest firmware version, which fixes this vulnerability. Proper network segmentation and access controls should also be implemented to restrict unauthorized remote access to these systems. Regular security updates are important to mitigate risks from vulnerabilities like this.