Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Wecon PIStudio. 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 parsing of hsc files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated object. An attacker can leverage this vulnerability to execute code under the context of an administrator.

This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.

05/18/18 - ZDI sent the report to ICS-CERT
05/22/18 - ICS-CERT acknowledged, confirmed the report was sent to the vendor and sent an ICS-VU #
09/17/18 - ZDI asked ICS-CERT to confirm the report remains unpatched and to advise the vendor of the intent to publish the report as 0-day on 10/02/18

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

• 2018-05-18 - Vulnerability reported to vendor
• 2018-10-02 - Coordinated public release of advisory
• 2021-12-02 - Advisory Updated