Multiple vulnerabilities in FATEK Automation WinProladder

Published: 2021-11-18 | Updated: 2022-01-14

Risk	High
Patch available	NO
Number of vulnerabilities	2
CVE-ID	CVE-2021-43554 CVE-2021-43556
CWE-ID	CWE-787 CWE-121
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	PLC WinProladder Other software / Other software solutions
Vendor	Fatek

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU58238

Risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-43554

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing project files. A remote attacker can trick the victim to open a specially crafted PDW file, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

PLC WinProladder: 3.30_24518

External links

http://ics-cert.us-cert.gov/advisories/icsa-21-320-01
http://www.zerodayinitiative.com/advisories/ZDI-22-028/
http://www.zerodayinitiative.com/advisories/ZDI-22-030/
http://www.zerodayinitiative.com/advisories/ZDI-22-033/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Stack-based buffer overflow

EUVDB-ID: #VU58239