This vulnerability allows local attackers to escalate privileges on affected installations of Advantech WebAccess Node. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the configuration of the PostgreSQL database. The issue results from incorrect permissions set on a resource used by the service. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of SYSTEM.
This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.
12/17/19 - ZDI reported the vulnerability to ICS-CERT
|Mat Powell of Trend Micro Zero Day Initiative