Vulnerability identifier: #VU58239

Vulnerability 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-2021-43556

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PLC WinProladder
Other software / Other software solutions

Vendor: Fatek

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target 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, SPF or TAB file, trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

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

Vulnerable software versions

PLC WinProladder: 3.30_24518

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External links
http://ics-cert.us-cert.gov/advisories/icsa-21-320-01
http://www.zerodayinitiative.com/advisories/ZDI-22-029/
http://www.zerodayinitiative.com/advisories/ZDI-22-031/
http://www.zerodayinitiative.com/advisories/ZDI-22-032/

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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.