rustsec-2023-0045
Vulnerability from osv_rustsec
Published
2023-06-21 12:00
Modified
2023-07-08 12:30
Summary
memoffset allows reading uninitialized memory
Details

memoffset allows attempt of reading data from address 0 with arbitrary type. This behavior is an undefined behavior because address 0 to std::mem::size_of<T> may not have valid bit-pattern with T. Old implementation dereferences uninitialized memory obtained from std::mem::align_of. Older implementation prior to it allows using uninitialized data obtained from std::mem::uninitialized with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for "father" that includes (directly or transitively) type that does not allow to be uninitialized.

This flaw was corrected by using std::ptr::addr_of in https://github.com/Gilnaa/memoffset/pull/50.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "memoffset::offset_of"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "memoffset",
        "purl": "pkg:cargo/memoffset"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.6.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-wfg4-322g-9vqv"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "memoffset allows attempt of reading data from address `0` with arbitrary type. This behavior is an undefined behavior because address `0` to `std::mem::size_of\u003cT\u003e` may not have valid bit-pattern with `T`. Old implementation dereferences uninitialized memory obtained from `std::mem::align_of`. Older implementation prior to it allows using uninitialized data obtained from `std::mem::uninitialized` with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for \"father\" that includes (directly or transitively) type that [does not allow to be uninitialized](https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html).\n\nThis flaw was corrected by using `std::ptr::addr_of` in \u003chttps://github.com/Gilnaa/memoffset/pull/50\u003e.",
  "id": "RUSTSEC-2023-0045",
  "modified": "2023-07-08T12:30:19Z",
  "published": "2023-06-21T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/memoffset"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2023-0045.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Gilnaa/memoffset/issues/24"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "memoffset allows reading uninitialized memory"
}


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