GHSA-WP34-MQW5-JJ85

Vulnerability from github – Published: 2021-08-25 20:52 – Updated: 2023-06-13 20:02
VLAI?
Summary
Use after free in nano_arena
Details

Affected versions of this crate assumed that Borrow was guaranteed to return the same value on .borrow(). The borrowed index value was used to retrieve a mutable reference to a value.

If the Borrow implementation returned a different index, the split arena would allow retrieving the index as a mutable reference creating two mutable references to the same element. This violates Rust's aliasing rules and allows for memory safety issues such as writing out of bounds and use-after-frees.

The flaw was corrected in commit 6b83f9d by storing the .borrow() value in a temporary variable.

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "nano_arena"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-28032"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-19T17:23:52Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "Affected versions of this crate assumed that Borrow\u003cIdx\u003e was guaranteed to return the same value on .borrow(). The borrowed index value was used to retrieve a mutable reference to a value.\n\nIf the Borrow\u003cIdx\u003e implementation returned a different index, the split arena would allow retrieving the index as a mutable reference creating two mutable references to the same element. This violates Rust\u0027s aliasing rules and allows for memory safety issues such as writing out of bounds and use-after-frees.\n\nThe flaw was corrected in commit `6b83f9d` by storing the .borrow() value in a temporary variable.",
  "id": "GHSA-wp34-mqw5-jj85",
  "modified": "2023-06-13T20:02:46Z",
  "published": "2021-08-25T20:52:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28032"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bennetthardwick/nano-arena/issues/1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bennetthardwick/nano-arena/commit/6b83f9d0708337a9f8b709c1624a8587021ceba2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bennetthardwick/nano-arena"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0031.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Use after free in nano_arena"
}


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