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CVE-2023-43632

Estado: ModificadaCrítica (9.9)—

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.

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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

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linuxfoundation — Edge Virtualization Engine

CWE

Referencias

JSON original (NVD)

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      "value": "\nAs noted in the “VTPM.md” file in the eve documentation, “VTPM is a server listening on port\n8877 in EVE, exposing limited functionality of the TPM to the clients. \nVTPM allows clients to\nexecute tpm2-tools binaries from a list of hardcoded options”\nThe communication with this server is done using protobuf, and the data is comprised of 2\nparts:\n\n1. Header\n\n2. Data\n\nWhen a connection is made, the server is waiting for 4 bytes of data, which will be the header,\nand these 4 bytes would be parsed as uint32 size of the actual data to come.\n\nThen, in the function “handleRequest” this size is then used in order to allocate a payload on\nthe stack for the incoming data.\n\nAs this payload is allocated on the stack, this will allow overflowing the stack size allocated for\nthe relevant process with freely controlled data.\n\n* An attacker can crash the system. \n* An attacker can gain control over the system, specifically on the “vtpm_server” process\nwhich has very high privileges.\n\n\n"
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      "lang": "es",
      "value": "Como se indica en el archivo “VTPM.md” en la documentación de eve, “VTPM es un servidor que escucha en el puerto 8877 en EVE, lo que expone la funcionalidad limitada del TPM a los clientes. VTPM permite a los clientes ejecutar binarios de tpm2-tools a partir de una lista de opciones codificadas. La comunicación con este servidor se realiza mediante protobuf y los datos se componen de 2 partes: 1. Encabezado 2. Datos Cuando se realiza una conexión, el servidor esperando 4 bytes de datos, que serán el encabezado, y estos 4 bytes se analizarán como el tamaño uint32 de los datos reales siguientes. Luego, en la función \"\"handleRequest\"\", este tamaño se usa para asignar un payload en memoria para los datos entrantes. A medida que este payload se asigna en la memoria, esto permitirá desbordar el tamaño asignado para el proceso relevante con datos libremente controlados. \n* Un atacante puede bloquear el sistema. \n* Un atacante puede obtener control sobre el sistema, específicamente sobre el proceso \"\"vtpm_server\"\", que tiene privilegios muy altos."
    }
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  "lastModified": "2026-06-17T06:26:06.863",
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