CVE-2020-12494 Information

Description

Beckhoff’s TwinCAT RT network driver for Intel 8254x and 8255x is providing EtherCAT functionality. The driver implements real-time features. Except for Ethernet frames sent from real-time functionality all other Ethernet frames sent through the driver are not padded if their payload is less than the minimum Ethernet frame size. Instead arbitrary memory content is transmitted within in the padding bytes of the frame. Most likely this memory contains slices from previously transmitted or received frames. By this method memory content is disclosed however an attacker can hardly control which memory content is affected. For example the disclosure can be provoked with small sized ICMP echo requests sent to the device.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

https://cert.vde.com/en-us/advisories/vde-2020-019

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3