Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Wecon LeviStudioU. 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 the HSC files. When parsing the General WordAddr element, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code under the context of Administrator.

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

03/07/18 - ZDI disclosed the report to ICS-CERT
03/12/18 - ICS-CERT assigned ICS‑VU‑031741 and notified ZDI
07/06/18 - ZDI inquired the status of ICS‑VU‑031741
07/09/18 - ICS-CERT replied that they would advise the vendor
07/19/18 - ZDI advised ICS-CERT of the intended 0-day date: 07/26/2018

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

• 2018-03-28 - Vulnerability reported to vendor
• 2018-07-26 - Coordinated public release of advisory
• 2018-08-02 - Advisory Updated