Advisory Details

November 10th, 2020

WECON LeviStudioU HSC File Parsing CharSize Attribute Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-1353
ZDI-CAN-11100

CVE ID CVE-2020-16243
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS WECON
AFFECTED PRODUCTS LeviStudio
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected 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 parsing of HSC files. The issue results from the lack of proper validation of the length of user-supplied data in a CharSize attribute prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of an administrator.

ADDITIONAL DETAILS WECON has issued an update to correct this vulnerability. More details can be found at:
https://us-cert.cisa.gov/ics/advisories/icsa-20-238-03
DISCLOSURE TIMELINE
  • 2020-07-15 - Vulnerability reported to vendor
  • 2020-11-10 - Coordinated public release of advisory
CREDIT Tran Van Khang - khangkito of VinCSS (Member of Vingroup)
BACK TO ADVISORIES