ghsa-438c-3975-5x3f
Vulnerability from github
Impact
A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content insertion code. This allowed iframe elements containing malicious code to execute when inserted into the editor. These iframe elements are restricted in their permissions by same-origin browser protections, but could still trigger operations such as downloading of malicious assets.
Fix
TinyMCE 6.8.1 introduced a new sandbox_iframes boolean option which adds the sandbox="" attribute to every iframe element by default when enabled. This will prevent cross-origin, and in special cases same-origin, XSS by embedded resources in iframe elements. From TinyMCE 7.0.0 onwards the default value of this option is true.
In TinyMCE 7.0.0 a new sandbox_iframes_exclusions option was also added, allowing a list of domains to be specified that should be excluded from having the sandbox="" attribute applied when the sandbox_iframes option is enabled. By default, this option is set to an array of domains that are provided in embed code by popular websites. To sandbox iframe elements from every domain, set this option to [].
Workarounds
The HTTP Content-Security-Policy (CSP) frame-src or object-src can be configured to restrict or block the loading of unauthorized URLS. Refer to the TinyMCE Content Security Policy Guide.
References
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "tinymce"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.8.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "NuGet",
"name": "TinyMCE"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.8.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Packagist",
"name": "tinymce/tinymce"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.8.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-29203"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2024-03-26T21:23:47Z",
"nvd_published_at": "2024-03-26T14:15:08Z",
"severity": "MODERATE"
},
"details": "### Impact\nA\u00a0[cross-site scripting (XSS)](https://owasp.org/www-community/attacks/xss/)\u00a0vulnerability was discovered in TinyMCE\u2019s content insertion code. This allowed `iframe` elements containing malicious code to execute when inserted into the editor. These `iframe` elements are restricted in their permissions by same-origin browser protections, but could still trigger operations such as downloading of malicious assets.\n\n### Fix\nTinyMCE 6.8.1 introduced a new `sandbox_iframes` boolean option which adds the `sandbox=\"\"` attribute to every `iframe` element by default when enabled. This will prevent cross-origin, and in special cases same-origin, XSS by embedded resources in `iframe` elements. From TinyMCE 7.0.0 onwards the default value of this option is `true`.\n\nIn TinyMCE 7.0.0 a new `sandbox_iframes_exclusions` option was also added, allowing a list of domains to be specified that should be excluded from having the\u00a0`sandbox=\"\"`\u00a0attribute applied when the\u00a0`sandbox_iframes`\u00a0option is enabled. By default, this option is set to an array of domains that are provided in embed code by popular websites. To sandbox `iframe` elements from every domain, set this option to `[]`.\n\n### Workarounds\nThe HTTP Content-Security-Policy (CSP) `frame-src` or `object-src` can be configured to restrict or block the loading of unauthorized URLS. Refer to the [TinyMCE Content Security Policy Guide](https://www.tiny.cloud/docs/tinymce/latest/tinymce-and-csp/).\n\n### References\n- [TinyMCE 6.8.1](https://www.tiny.cloud/docs/tinymce/6/6.8.1-release-notes/#new-convert_unsafe_embeds-option-that-controls-whether-object-and-embed-elements-will-be-converted-to-more-restrictive-alternatives-namely-img-for-image-mime-types-video-for-video-mime-types-audio-audio-mime-types-or-iframe-for-other-or-unspecified-mime-types)\n- [TinyMCE 7.0.0](https://www.tiny.cloud/docs/tinymce/7/7.0-release-notes/#sandbox_iframes-editor-option-is-now-defaulted-to-true)\n",
"id": "GHSA-438c-3975-5x3f",
"modified": "2024-03-28T13:28:10Z",
"published": "2024-03-26T21:23:47Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/tinymce/tinymce/security/advisories/GHSA-438c-3975-5x3f"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-29203"
},
{
"type": "WEB",
"url": "https://github.com/tinymce/tinymce/commit/bcdea2ad14e3c2cea40743fb48c63bba067ae6d1"
},
{
"type": "PACKAGE",
"url": "https://github.com/tinymce/tinymce"
},
{
"type": "WEB",
"url": "https://www.tiny.cloud/docs/tinymce/6/6.8.1-release-notes/#new-convert_unsafe_embeds-option-that-controls-whether-object-and-embed-elements-will-be-converted-to-more-restrictive-alternatives-namely-img-for-image-mime-types-video-for-video-mime-types-audio-audio-mime-types-or-iframe-for-other-or-unspecified-mime-types"
},
{
"type": "WEB",
"url": "https://www.tiny.cloud/docs/tinymce/7/7.0-release-notes/#sandbox_iframes-editor-option-is-now-defaulted-to-true"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "TinyMCE Cross-Site Scripting (XSS) vulnerability in handling iframes"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.