GHSA-XCPM-76HF-C9CC

Vulnerability from github – Published: 2025-10-22 16:35 – Updated: 2025-10-22 16:35
VLAI?
Summary
Borrowck Scarifices exposes uninitialized memory in any_as_u8_slice
Details

The safe function any_as_u8_slice can create byte slices that reference uninitialized memory when used with types containing padding bytes.

The function uses slice::from_raw_parts to create a &[u8] covering the entire size of a type, including padding bytes. According to Rust's documentation, from_raw_parts requires all bytes to be properly initialized, but padding bytes in structs are not guaranteed to be initialized. This violates the safety contract and causes undefined behavior.

Severity ?
2.0 (Low)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "borrowck_sacrifices"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-824"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-22T16:35:08Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "The safe function `any_as_u8_slice` can create byte slices that reference uninitialized memory when used with types containing padding bytes.\n\nThe function uses `slice::from_raw_parts` to create a `\u0026[u8]` covering the entire size of a type, including padding bytes. According to Rust\u0027s documentation, `from_raw_parts` requires all bytes to be properly initialized, but padding bytes in structs are not guaranteed to be initialized. This violates the safety contract and causes undefined behavior.",
  "id": "GHSA-xcpm-76hf-c9cc",
  "modified": "2025-10-22T16:35:08Z",
  "published": "2025-10-22T16:35:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/alexpyattaev/borrowck_sacrifices/issues/1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexpyattaev/borrowck_sacrifices/commit/1bdaa14da68a6e8207f9e81359116f53139800f2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alexpyattaev/borrowck_sacrifices"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2025-0107.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Borrowck Scarifices exposes uninitialized memory in any_as_u8_slice"
}


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