GHSA-4MQ4-7RW3-VM5J

Vulnerability from github – Published: 2023-12-13 13:32 – Updated: 2024-01-03 16:44
VLAI?
Summary
Wasmer filesystem sandbox not enforced
Details

Summary

As of Wasmer version v4.2.3, Wasm programs can access the filesystem outside of the sandbox.

Details

https://github.com/wasmerio/wasmer/issues/4267

PoC

A minimal Rust program:

fn main() {
    let f = std::fs::OpenOptions::new()
        .write(true)
        .create_new(true)
        .open("abc")
        .unwrap();
}

This should be compiled with cargo build --target wasm32-wasi. The compiled program, when run with wasmer WITHOUT --dir, can still create a file in the working directory.

Impact

Service providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem.

Severity ?
8.4 (High)
CVSS:3.1/AV:L/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": "wasmer-cli"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "4.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-51661"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-12-13T13:32:38Z",
    "nvd_published_at": "2023-12-22T15:15:08Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nAs of Wasmer version v4.2.3, Wasm programs can access the filesystem outside of the sandbox.\n\n### Details\nhttps://github.com/wasmerio/wasmer/issues/4267\n\n### PoC\nA minimal Rust program:\n\n```\nfn main() {\n    let f = std::fs::OpenOptions::new()\n        .write(true)\n        .create_new(true)\n        .open(\"abc\")\n        .unwrap();\n}\n```\n\nThis should be compiled with `cargo build --target wasm32-wasi`. The compiled program, when run with wasmer WITHOUT `--dir`, can still create a file in the working directory.\n\n### Impact\nService providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem.",
  "id": "GHSA-4mq4-7rw3-vm5j",
  "modified": "2024-01-03T16:44:36Z",
  "published": "2023-12-13T13:32:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wasmerio/wasmer/security/advisories/GHSA-4mq4-7rw3-vm5j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-51661"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wasmerio/wasmer/issues/4267"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wasmerio/wasmer/commit/4d63febf9d8b257b0531963b85df48d45d0dbf3c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wasmerio/wasmer/commit/e3923612c23123025c26f982d390e34df7df030f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wasmerio/wasmer"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Wasmer filesystem sandbox not enforced"
}


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