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 breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected products
- Beckhoff / TwinCat Driver for Intel 8254x (Tcl8254x.sys)unspecified – 3.1.0.3603 for TwinCAT 3.1 4024
- Beckhoff / TwinCat Driver for Intel 8254x (Tcl8254x.sys)unspecified – 3.1.0.3512 for TwinCAT 3.1 4022
- Beckhoff / TwinCat Driver for Intel 8254x (Tcl8254x.sys)unspecified – 2.11.0.2120 for TwinCAT 2.11 2350
- Beckhoff / TwinCat Driver for Intel 8255x (Tcl8255x.sys)unspecified – 3.1.0.3600 for TwinCAT 3.1 4024
- Beckhoff / TwinCat Driver for Intel 8255x (Tcl8255x.sys)unspecified – 3.1.0.3500 for TwinCAT 3.1 4024
- Beckhoff / TwinCat Driver for Intel 8255x (Tcl8255x.sys)unspecified – 2.11.0.2117 for TwinCAT 2.11 2350
References
- VENDOR_ADVISORYhttps://cert.vde.com/en-us/advisories/vde-2020-019