Preface: Cyber Security expert not suggest access SCADA Dashboard from external area (internet). But we can use VPN establish connection then sign on as a workaround.

Background: Advantech WebAccess/SCADA is a browser-based SCADA software package for supervisory control, data acquisition and visualization.

Vulnerability details: In WebAccess/SCADA Versions 8.3.5 and prior, multiple heap-based buffer overflow vulnerabilities are caused by a lack of proper validation of the length of user-supplied data.

CVE-2019-10989 – The specific flaw exists within the implementation of the 0x113d1 IOCTL in the webvrpcs process.

CVE-2019-10991 – The specific flaw exists within bwclient.exe, which is accessed through the 0x2711 IOCTL in the webvrpcs process.

CVE-2019-10993 – The specific flaw exists within the implementation of the 0x27E9 IOCTL in the webvrpcs process.

Summary: Stack based & heap based buffer overflow and untrusted pointer dereference Remote Code Execution are all found in this product. Ioctl is a function in the device driver that manages the device’s I/O channels. The so-called I/O channel management is to control some characteristics of the device.

Reference: A stack-based buffer overflow vulnerability exists in a call to strcpy. Strcpy is one of the functions of the C language. It comes from the C standard library, defined in string.h, which can copy a memory block with a null end character into another memory block.
So attacker can leverage this vulnerability to execute code under the context of Administrator.

Advantech has issued an update to correct this vulnerability – https://www.us-cert.gov/ics/advisories/icsa-19-178-05