rustsec-2021-0131
Vulnerability from osv_rustsec
Published
2021-12-20 12:00
Modified
2021-12-21 20:51
Summary
Integer overflow in the bundled Brotli C library
Details

A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB.

An updated version of brotli-sys has not been released. If one cannot update the C library, its authors recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

In Rust the issue can be mitigated by migrating to the brotli crate, which provides a Rust implementation of Brotli compression and decompression that is not affected by this issue.

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "brotli-sys",
        "purl": "pkg:cargo/brotli-sys"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2020-8927"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a \"one-shot\" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB.\n\nAn updated version of `brotli-sys` has not been released. If one cannot update the C library, its authors recommend to use the \"streaming\" API as opposed to the \"one-shot\" API, and impose chunk size limits.\n\nIn Rust the issue can be mitigated by migrating to the `brotli` crate, which provides a Rust implementation of Brotli compression and decompression that is not affected by this issue.",
  "id": "RUSTSEC-2021-0131",
  "modified": "2021-12-21T20:51:30Z",
  "published": "2021-12-20T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/brotli-sys"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0131.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bitemyapp/brotli2-rs/issues/45"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/releases/tag/v1.0.9"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Integer overflow in the bundled Brotli C library"
}


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