rustsec-2024-0435
Vulnerability from osv_rustsec
Published
2024-12-19 12:00
Modified
2025-10-28 06:02
Summary
Unsound usages of `Vec::from_raw_parts`
Details

The library provides a public safe API transmute_vec_as_bytes, which incorrectly assumes that any generic type T could have stable layout, causing to uninitialized memory exposure if the users pass any types with padding bytes as T and cast it to u8 pointer.

In the issue, we develop a PoC to show passing struct type to transmute_vec_as_bytes could lead to undefined behavior with Vec::from_raw_parts.

The developers provide a patch by changing trait of Copy to Pod, which can make sure T should be plain data. This was patched in the latest version of master branch, but still not on the latest release (0.28.1).

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "fyrox_core::transmute_vec_as_bytes"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "fyrox-core",
        "purl": "pkg:cargo/fyrox-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.36.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-h7h7-6mx3-r89v"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The library provides a public safe API `transmute_vec_as_bytes`, which incorrectly assumes that any generic type `T` could have stable layout, causing to uninitialized memory exposure if the users pass any types with padding bytes as `T` and cast it to `u8` pointer.  \n\nIn the [issue](https://github.com/FyroxEngine/Fyrox/issues/630), we develop a PoC to show passing struct type to `transmute_vec_as_bytes` could lead to undefined behavior with `Vec::from_raw_parts`.  \n\nThe developers provide a patch by changing trait of `Copy` to `Pod`, which can make sure `T` should be plain data. This was patched in the latest version of [master](https://github.com/FyroxEngine/Fyrox/blob/3f9ad6f9667047dac051b0e97d544e5b38e5ae72/fyrox-core/src/lib.rs#L351-L360) branch, but still not on the latest release (0.28.1).",
  "id": "RUSTSEC-2024-0435",
  "modified": "2025-10-28T06:02:18Z",
  "published": "2024-12-19T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/fyrox-core"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2024-0435.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/FyroxEngine/Fyrox/issues/630"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FyroxEngine/Fyrox/pull/662"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Unsound usages of `Vec::from_raw_parts`"
}


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