Vulnerability · Published Jun 16, 2020 · Assigned by CERTVDE
CVE-2020-12494Beckhoff: Etherleak in TwinCAT RT network driver
Medium 5.3
In plain English
A medium-severity security flaw in TwinCat Driver for Intel 8254x (Tcl8254x.sys) from Beckhoff. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Beckhoff | TwinCat Driver for Intel 8254x (Tcl8254x.sys) | unspecified – through 3.1.0.3603 for TwinCAT 3.1 4024unspecified – through 3.1.0.3512 for TwinCAT 3.1 4022unspecified – through 2.11.0.2120 for TwinCAT 2.11 2350 |
| Beckhoff | TwinCat Driver for Intel 8255x (Tcl8255x.sys) | unspecified – through 3.1.0.3600 for TwinCAT 3.1 4024unspecified – through 3.1.0.3500 for TwinCAT 3.1 4024unspecified – through 2.11.0.2117 for TwinCAT 2.11 2350 |
Weakness: CWE-459 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://cert.vde.com/en-us/advisories/vde-2020-019 x_refsource_CONFIRM