As noted in the “VTPM.md” file in the eve documentation, “VTPM is a server listening on port 8877 in EVE, exposing limited functionality of the TPM to the clients. VTPM allows clients to execute tpm2-tools binaries from a list of hardcoded options” The communication with this server is done using protobuf, and the data is comprised of 2 parts:
Header
Data
When a connection is made, the server is waiting for 4 bytes of data, which will be the header, and these 4 bytes would be parsed as uint32 size of the actual data to come.
Then, in the function “handleRequest” this size is then used in order to allocate a payload on the stack for the incoming data.
As this payload is allocated on the stack, this will allow overflowing the stack size allocated for the relevant process with freely controlled data.
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Edge_virtualization_engine | Linuxfoundation | 3.0.0 (including) | 9.5.0 (excluding) |