GHSA-VC9J-FHVV-8VRF

Vulnerability from github – Published: 2020-07-27 19:55 – Updated: 2023-09-12 18:20
VLAI?
Summary
Remote Code Execution in scratch-vm
Details

MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented.

NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.

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": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.2.0-prerelease.20200709173451"
      },
      "package": {
        "ecosystem": "npm",
        "name": "scratch-vm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.0-prerelease.20200714185213"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-14000"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-07-27T19:53:24Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "MIT Lifelong Kindergarten Scratch scratch-vm before `0.2.0-prerelease.20200714185213` loads extension URLs from untrusted project.json files with certain `_` characters, resulting in remote code execution because the URL\u0027s content is treated as a script and is executed as a worker. The responsible code is `getExtensionIdForOpcode` in serialization/sb3.js. The use of `_` is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented. \n\n**NOTE**: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.",
  "id": "GHSA-vc9j-fhvv-8vrf",
  "modified": "2023-09-12T18:20:33Z",
  "published": "2020-07-27T19:55:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14000"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LLK/scratch-vm/pull/2476"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LLK/scratch-vm/pull/2476/commits/90b9da45f4084958535338d1c4d71a22d6136aab"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/LLK/scratch-vm"
    },
    {
      "type": "WEB",
      "url": "https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443"
    }
  ],
  "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": "Remote Code Execution in scratch-vm"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.