GHSA-VRV8-V4W8-F95H

Vulnerability from github – Published: 2020-08-11 14:55 – Updated: 2023-05-22 14:51
VLAI?
Summary
Cross-site scripting vulnerability in TinyMCE
Details

Impact

A cross-site scripting (XSS) vulnerability was discovered in the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.10 or lower and TinyMCE 5.4.0 or lower.

Patches

This vulnerability has been patched in TinyMCE 4.9.11 and 5.4.1 by improved HTML parsing and sanitization logic.

Workarounds

The workarounds available are: - upgrade to either TinyMCE 4.9.11 or TinyMCE 5.4.1 or - enable the media plugin, which overrides the default parsing behaviour for iframes or - add the following workaround to update the parsing schema rules for iframes:

Example: Change the default schema for iframes

setup: function(editor) {
  editor.on('PreInit', function() {
    editor.schema.getSpecialElements()['iframe'] = /</iframe[^>]*>/gi;
  });
}

Acknowledgements

Tiny Technologies would like to thank George Steketee and Chris Davis at Bishop Fox for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes54/#securityfixes

For more information

If you have any questions or comments about this advisory: * Open an issue in the TinyMCE repo * Email us at infosec@tiny.cloud

Severity ?
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-12648"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-08-10T22:39:05Z",
    "nvd_published_at": "2020-08-14T14:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nA cross-site scripting (XSS) vulnerability was discovered in the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.10 or lower and TinyMCE 5.4.0 or lower.\n\n### Patches\nThis vulnerability has been patched in TinyMCE 4.9.11 and 5.4.1 by improved HTML parsing and sanitization logic.\n\n### Workarounds\nThe workarounds available are:\n- upgrade to either TinyMCE 4.9.11 or TinyMCE 5.4.1\nor\n- enable the media plugin, which overrides the default parsing behaviour for iframes\nor\n- add the following workaround to update the parsing schema rules for iframes:\n\n#### Example: Change the default schema for iframes\n```js\nsetup: function(editor) {\n  editor.on(\u0027PreInit\u0027, function() {\n    editor.schema.getSpecialElements()[\u0027iframe\u0027] = /\u003c/iframe[^\u003e]*\u003e/gi;\n  });\n}\n```\n\n### Acknowledgements\nTiny Technologies would like to thank George Steketee and Chris Davis at [Bishop Fox](https://www.bishopfox.com/) for discovering this vulnerability.\n\n### References\nhttps://www.tiny.cloud/docs/release-notes/release-notes54/#securityfixes\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in the [TinyMCE repo](https://github.com/tinymce/tinymce/issues)\n* Email us at [infosec@tiny.cloud](mailto:infosec@tiny.cloud)",
  "id": "GHSA-vrv8-v4w8-f95h",
  "modified": "2023-05-22T14:51:38Z",
  "published": "2020-08-11T14:55:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/security/advisories/GHSA-vrv8-v4w8-f95h"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/pull/5843"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/commit/2b71c922214d388838d930806207a66c14e80f63"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/commit/696e43658dc9750ec24fdc4650bd2be9653daf5b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tinymce/tinymce"
    },
    {
      "type": "WEB",
      "url": "https://www.tiny.cloud/docs/release-notes/release-notes54/#securityfixes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Cross-site scripting vulnerability in TinyMCE"
}


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  • 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.



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