Advisory Details

January 13th, 2022

Fatek Automation WinProladder TAB File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-22-031
ZDI-CAN-14465

CVE ID CVE-2021-43556
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Fatek Automation
AFFECTED PRODUCTS WinProladder
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Fatek Automation WinProladder. 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 TAB files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Fatek Automation has issued an update to correct this vulnerability. More details can be found at:
https://www.cisa.gov/uscert/ics/advisories/icsa-21-320-01
DISCLOSURE TIMELINE
  • 2021-07-30 - Vulnerability reported to vendor
  • 2022-01-13 - Coordinated public release of advisory
CREDIT Natnael Samson (@NattiSamson)
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