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 FontLib.dll module. Strings read from input are not properly checked for null-terminating characters before using them later in memory read/write calls. 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 the ZDI 120 day deadline.

07/12/18 – ZDI provided the reports to ICS-CERT
08/16/18 – ICS-CERT provided an ICS-VU#
11/15/18 – ZDI requested any update from ICS-CERT
11/26/18 – ZDI requested any update from ICS-CERT
12/07/18 – ZDI requested any update from ICS-CERT
01/09/19 – ZDI advised ICS-CERT of the intention to 0-day publish
01/25/19 – ZDI telephoned ICS-CERT to discuss status and 0-day publish

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

• 2018-07-25 - Vulnerability reported to vendor
• 2019-01-29 - Coordinated public release of advisory
• 2019-05-30 - Advisory Updated