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As noted in the “VTPM.md” file in the eve documentation,...

Critical severity Unreviewed Published Sep 21, 2023 to the GitHub Advisory Database • Updated Apr 4, 2024

Package

No package listedSuggest a package

Affected versions

Unknown

Patched versions

Unknown

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.

References

Published by the National Vulnerability Database Sep 21, 2023
Published to the GitHub Advisory Database Sep 21, 2023
Last updated Apr 4, 2024

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Adjacent
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS score

0.089%
(39th percentile)

CVE ID

CVE-2023-43632

GHSA ID

GHSA-vpjr-h6fh-mw4p

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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