Vulnerability identifier: #VU29534

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12494

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TwinCAT
Client/Desktop applications / Software for system administration

Vendor: Beckhoff

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to TwinCAT RT network driver for Intel 8254x and 8255x does not properly construct frames if their payload is less than the minimum Ethernet frame size. As a result, arbitrary system memory contents is transmitted within in the padding bytes of the frame.

Mitigation
Contact your vendor to obtain patches.

Vulnerable software versions

TwinCAT: 2.11 2305 - 3.1 4024.10

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External links
http://cert.vde.com/en-us/advisories/vde-2020-019

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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.