CVE-2023-43632

Technical Description

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:

1. Header

2. 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.

* An attacker can crash the system.

* An attacker can gain control over the system, specifically on the “vtpm_server” process

which has very high privileges.

Remediation

Check the references section for vendor advisories and patches from linuxfoundation. Update edge_virtualization_engine to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References