Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Edge Virtualization Engine | >= 3.0.0, < 9.5.0 |
Related Weaknesses (CWE)
References
- https://asrg.io/security-advisories/cve-2023-43632/
- https://asrg.io/security-advisories/cve-2023-43632/
FAQ
What is CVE-2023-43632?
CVE-2023-43632 is a vulnerability with a CVSS score of 9.0 (CRITICAL). 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 tpm...
How severe is CVE-2023-43632?
CVE-2023-43632 has been rated CRITICAL with a CVSS base score of 9.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2023-43632?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Edge Virtualization Engine.