CVE-2020-12494 Beckhoff: Etherleak in TwinCAT RT network driver
An attacker can read arbitrary memory contents from the network driver by sending small ICMP packets, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-12494?
CVE-2020-12494 is a medium-severity vulnerability in Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys), published on 16 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-459
Which versions are affected by CVE-2020-12494?
It affects 2 products.
Products include Beckhoff Twincat, Beckhoff Twincat Driver.
How do I fix CVE-2020-12494?
No fix has been published for CVE-2020-12494 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-12494 being exploited?
There is no known exploitation of CVE-2020-12494 in the wild and no public exploit code.
Other vulnerabilities in Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys)
Sources
Also known as GHSA-92f3-r9r6-rrfr.