Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Beckhoff | Twincat Driver | <= 3.1.0.3603 |
| Beckhoff | Twincat | 3.1 |
| Intel | 82540Em | - |
| Intel | 82540Ep | - |
| Intel | 82541Ei | - |
| Intel | 82541Er | - |
| Intel | 82541Gi | - |
| Intel | 82541Pi | - |
| Intel | 82544Ei | - |
| Intel | 82544Gc | - |
| Intel | 82545Em | - |
| Intel | 82545Gm | - |
| Intel | 82546Eb | - |
| Intel | 82546Gb | - |
| Intel | 82547Ei | - |
| Intel | 82547Gi | - |
| Intel | 82547Ei | - |
| Intel | 82557 | - |
| Intel | 82558 | - |
| Intel | 82559 | - |
Related Weaknesses (CWE)
References
- https://cert.vde.com/en-us/advisories/vde-2020-019Third Party Advisory
- https://cert.vde.com/en-us/advisories/vde-2020-019Third Party Advisory
FAQ
What is CVE-2020-12494?
CVE-2020-12494 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 functionali...
How severe is CVE-2020-12494?
CVE-2020-12494 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12494?
Check the references section above for vendor advisories and patch information. Affected products include: Beckhoff Twincat Driver, Beckhoff Twincat, Intel 82540Em, Intel 82540Ep, Intel 82541Ei.