CVE-2023-43632

Aliases:GHSA-6jp5-grgh-jw42GO-2026-4422
Advisory lineage Upstream: 0 Downstream: 1
Modified
Published: 21 Sept 2023, 13:13
Last modified:24 Sept 2024, 17:09

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.9 CRITICAL
v3.1 (nvd)
EPSS Score
0.07% LOW
0% probability -0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 Sept 2023, 13:13
Published
Vulnerability first disclosed
24 Sept 2024, 17:09
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•CRITICAL•Score: 9CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • v3.1•CRITICAL•Score: 9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.07%• Percentile: 22%

Techniques & Countermeasures

  • CWE-789•Memory Allocation with Excessive Size Value

    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.

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • github.com/lf-edge•eve

    < 0.0.0-20230519072751-977f42b07fa9

  • lf-edge, zededa•eve os

    ≥ 3.0.0, < 9.5.0

  • linuxfoundation•edge_virtualization_engine

    ≥ 3.0.0, < 9.5.0

References (6)