rustsec-2024-0001
Vulnerability from osv_rustsec
Published
2024-01-13 12:00
Modified
2024-02-10 15:57
Summary
Unsound use of str::from_utf8_unchecked on bytes which are not UTF-8
Details

Affected versions receive a &[u8] from the caller through a safe API, and pass it directly to the unsafe str::from_utf8_unchecked function.

The behavior of ferris_says::say is undefined if the bytes from the caller don't happen to be valid UTF-8.

The flaw was corrected in ferris-says#21 by using the safe str::from_utf8 instead, and returning an error on invalid input. However this fix has not yet been published to crates.io as a patch version for 0.2.

Separately, ferris-says#32 has introduced a different API for version 0.3 which accepts input as &str rather than &[u8], so is unaffected by this bug.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "ferris-says",
        "purl": "pkg:cargo/ferris-says"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.3-0"
            },
            {
              "fixed": "0.3.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-v363-rrf2-5fmj"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Affected versions receive a `\u0026[u8]` from the caller through a safe API, and pass\nit directly to the unsafe `str::from_utf8_unchecked` function.\n\nThe behavior of `ferris_says::say` is undefined if the bytes from the caller\ndon\u0027t happen to be valid UTF-8.\n\nThe flaw was corrected in [ferris-says#21] by using the safe `str::from_utf8`\ninstead, and returning an error on invalid input. However this fix has not yet\nbeen published to crates.io as a patch version for 0.2.\n\nSeparately, [ferris-says#32] has introduced a different API for version 0.3\nwhich accepts input as `\u0026str` rather than `\u0026[u8]`, so is unaffected by this bug.\n\n[ferris-says#21]: https://github.com/rust-lang/ferris-says/pull/21\n[ferris-says#32]: https://github.com/rust-lang/ferris-says/pull/32",
  "id": "RUSTSEC-2024-0001",
  "modified": "2024-02-10T15:57:43Z",
  "published": "2024-01-13T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/ferris-says"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2024-0001.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-lang/ferris-says/pull/21"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Unsound use of str::from_utf8_unchecked on bytes which are not UTF-8"
}


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