CVE-2022-25863: Gatsby plugin mdx Unsanitized JavaScript Code Injection Possible Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mj46-r4gr-5x83",
  "modified" : "2022-06-06T18:59:37Z",
  "published" : "2022-06-03T22:32:06Z",
  "aliases" : [ "CVE-2022-25863" ],
  "summary" : "Unsanitized JavaScript code injection possible in gatsby-plugin-mdx",
  "details" : "### Impact\nThe gatsby-plugin-mdx plugin prior to versions 3.15.2 and 2.14.1 passes input through to the `gray-matter` npm package, which is vulnerable to JavaScript injection in its default configuration, unless input is sanitized.  The vulnerability is present when passing input in both webpack (MDX files in `src/pages` or MDX file imported as component in frontend / React code) and data mode (querying MDX nodes via GraphQL).  Injected JavaScript executes in the context of the build server.\n\nTo exploit this vulnerability untrusted/unsanitized input would need to be sourced or added into an MDX file.  The following MDX payload demonstrates a vulnerable configuration:\n```\n---js\n((require(\"child_process\")).execSync(\"id >> /tmp/rce\"))\n--- \n```\n\n### Patches\nA patch has been introduced in `gatsby-plugin-mdx@3.15.2` and `gatsby-plugin-mdx@2.14.1` which mitigates the issue by disabling the `gray-matter` JavaScript Frontmatter engine.  The patch introduces a new option, `JSFrontmatterEngine` which is set to `false` by default.  When setting `JSFrontmatterEngine` to `true`, input passed to `gatsby-plugin-mdx` must be sanitized before processing to avoid a security risk.  Warnings are displayed when enabling `JSFrontmatterEngine` to `true` or if it appears that the MDX input is attempting to use the Frontmatter engine.\n\n### Workarounds\nIf an older version of `gatsby-plugin-mdx` must be used, input passed into the plugin should be sanitized ahead of processing.\n\n**We encourage projects to upgrade to the latest major release branch for all Gatsby plugins to ensure the latest security updates and bug fixes are received in a timely manner.**\n\n### Credits\nWe would like to thank Snyk [snyk.io] for initially bringing the issue to our attention, as well as Feng Xiao and Zhongfu Su, who reported the issue to Snyk.\n\n### For more information\nEmail us at [security@gatsbyjs.com](mailto:security@gatsbyjs.com).\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "gatsby-plugin-mdx"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.14.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "gatsby-plugin-mdx"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.15.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/gatsbyjs/gatsby/security/advisories/GHSA-mj46-r4gr-5x83"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-25863"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gatsbyjs/gatsby/pull/35830"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gatsbyjs/gatsby/pull/35830/commits/f214eb0694c61e348b2751cecd1aace2046bc46e"
  }, {
    "type" : "WEB",
    "url" : "https://drive.google.com/file/d/1EoCzbwTWOM8-fjvwMbH3bqcZ2iKksxTW/view?usp=sharing"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gatsbyjs/gatsby"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-GATSBYPLUGINMDX-2405699"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-03T22:32:06Z",
    "nvd_published_at" : "2022-06-10T20:15:00Z"
  }
}