medium
5.3
CWE
459
Advisory Published
Updated

CVE-2020-12494: Beckhoff: Etherleak in TwinCAT RT network driver

First published: Tue Jun 16 2020(Updated: )

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.

Credit: info@cert.vde.com

Affected SoftwareAffected VersionHow to fix
Beckhoff TwinCAT Driver<=3.1.0.3603
Beckhoff TwinCAT Extended Automation Runtime=3.1-build_4024
Intel 82540EP
Intel 82540EM
Intel 82541ER
Intel 82541ER
Intel 82541GI Gigabit Ethernet Controller
Intel 82541PI
Intel 82544EI
Intel 82544GC Gigabit Network Connection
Intel 82545EM Gigabit Ethernet Controller
Intel 82545GM
Intel 82546EB
Intel 82546GB Gigabit Ethernet Controller
Intel 82547EI
Intel 82547GI
Beckhoff TwinCAT Extended Automation Runtime<=3.1.0.3512
Beckhoff TwinCAT Extended Automation Runtime=3.1-build_4022
Intel 82547EI
Beckhoff TwinCAT Extended Automation Runtime<=2.11.0.2120
Beckhoff TwinCAT Extended Automation Runtime=2.11-build_2350
Beckhoff TwinCAT Extended Automation Runtime<=3.1.0.3600
Beckhoff TwinCAT Extended Automation Runtime=3.1-build_402
Intel 82557
Intel 82558
Intel 82559
Beckhoff TwinCAT Extended Automation Runtime<=3.1.0.3500
Beckhoff TwinCAT Extended Automation Runtime<=2.11.0.2117

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-12494?

    CVE-2020-12494 has been assigned a medium severity level due to potential impacts on the network functionality.

  • How do I fix CVE-2020-12494?

    The best approach to fix CVE-2020-12494 is to update the Beckhoff TwinCAT driver to a patched version that addresses this vulnerability.

  • What versions of Beckhoff TwinCAT are affected by CVE-2020-12494?

    Beckhoff TwinCAT versions prior to 3.1.0.3604 are vulnerable to CVE-2020-12494.

  • What components are involved in CVE-2020-12494?

    CVE-2020-12494 involves the Beckhoff TwinCAT RT network driver used with Intel 8254x and 8255x series Ethernet controllers.

  • Can CVE-2020-12494 lead to remote code execution?

    CVE-2020-12494 does not directly lead to remote code execution but may allow certain network manipulation that could be exploited.

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