Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of WECON PLC Editor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of WCP files. A crafted PortPath element in a WCP file can trigger an overflow of a fixed-length buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability is being disclosed publicly without a patch in accordance with ZDI policies.

08/08/2019 - ZDI reported the Vulnerability to ICS-CERT
08/14/2019 - ICS-CERT acknowledged the report and provided an ICS-VU#
12/13/2019 - ZDI requested any available update
12/18/2019 - ZDI advised ICS-CERT of the intention to publish the report as 0-day on 12/30/2019

-- Mitigation:
Given the nature of the vulnerability the only salient mitigation strategy is to restrict interaction with the application.

• 2019-08-09 - Vulnerability reported to vendor
• 2019-12-30 - Coordinated public release of advisory