Vulnerability identifier: #VU57142

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-2021-38434

CWE-ID: CWE-194

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 compromise the target system.

The vulnerability exists due to unexpected sign extension when parsing project files. A remote attacker can trick a victim to open a specially crafted PDW file 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

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External links
http://ics-cert.us-cert.gov/advisories/icsa-21-280-06
http://www.zerodayinitiative.com/advisories/ZDI-21-1168/

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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.