CVE-2023-36828 (GCVE-0-2023-36828)
Vulnerability from cvelistv5 – Published: 2023-07-05 21:30 – Updated: 2024-10-24 18:06
VLAI?
Title
Statamic's Antlers sanitizer cannot effectively sanitize malicious SVG
Summary
Statamic is a flat-first, Laravel and Git powered content management system. Prior to version 4.10.0, the SVG tag does not sanitize malicious SVG. Therefore, an attacker can exploit this vulnerability to perform cross-site scripting attacks using SVG, even when using the `sanitize` function. Version 4.10.0 contains a patch for this issue.
Severity ?
5.5 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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FKIE_CVE-2023-36828
Vulnerability from fkie_nvd - Published: 2023-07-05 22:15 - Updated: 2024-11-21 08:10
Severity ?
5.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Summary
Statamic is a flat-first, Laravel and Git powered content management system. Prior to version 4.10.0, the SVG tag does not sanitize malicious SVG. Therefore, an attacker can exploit this vulnerability to perform cross-site scripting attacks using SVG, even when using the `sanitize` function. Version 4.10.0 contains a patch for this issue.
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GSD-2023-36828
Vulnerability from gsd - Updated: 2023-12-13 01:20Details
Statamic is a flat-first, Laravel and Git powered content management system. Prior to version 4.10.0, the SVG tag does not sanitize malicious SVG. Therefore, an attacker can exploit this vulnerability to perform cross-site scripting attacks using SVG, even when using the `sanitize` function. Version 4.10.0 contains a patch for this issue.
Aliases
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"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.3,
"impactScore": 2.7
}
},
"lastModifiedDate": "2023-07-12T15:48Z",
"publishedDate": "2023-07-05T22:15Z"
}
}
}
GHSA-6R5G-CQ4Q-327G
Vulnerability from github – Published: 2023-07-06 20:56 – Updated: 2023-07-06 20:56
VLAI?
Summary
Statamic's Antlers sanitizer cannot effectively sanitize malicious SVG
Details
Antlers sanitizer cannot effectively sanitize malicious SVG
Summary
The SVG tag does not sanitize malicious SVG. Therefore, an attacker can exploit this vulnerability to perform XSS attacks using SVG, even when using the sanitize function.
Details
Regarding the previous discussion mentioned here, it has been identified that the default blacklist in the FilesFieldtypeController (located at this link) only blocks certain file extensions such as php, php3, php4, php5, and phtml. This allows a malicious user to upload a manipulated SVG file disguised as a social media icon, potentially triggering an XSS vulnerability.
PoC Screenshot
PoC
- Create new Global set, let's say "Settings"
- Create a "Grid" field in Blueprint (named: social), then add somefields Name (text), URL (text) and Icon (Assets) in the section Fields.
- When calling the social setting in the
_footer.antlers.html, remember to sanitize
{{ settings:social }}
<a href="{{ $url }}" class="ml-4" aria-label="{{ $name }}" rel="noopener">
{{ svg :src="icon" class="h-6 w-6 hover:text-hot-pink" | sanitize }}
</a>
{{ /settings:social }}
- Upload the malicious SVG image, here is the code:
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="500" height="500" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<text x="20" y="35">Statamic</text>
<foreignObject width="500" height="500">
<iframe xmlns="http://www.w3.org/1999/xhtml" src="javascript:confirm(document.cookie);" width="400" height="250"/>
</foreignObject>
</svg>
Impact
Since the social media icon is displayed in the footer layout, any user can view it, potentially leading to the execution of XSS.
Suggestions to Mitigate or Resolve the Issue:
Sanitize when outputing the svg. This vulnerability caused by unsanitized File::get() when retrieving the SVG, it is crucial to sanitize the SVG when outputting it. The issue can be found in the following file: https://github.com/statamic/cms/blob/f806b6b007ddcf066082eef175653c5beaa96d60/src/Tags/Svg.php#L36-L40.
It is highly recommended to implement proper sanitization measures to ensure the security of the SVG content. One effective approach is to utilize a reliable package, such as https://github.com/darylldoyle/svg-sanitizer ,which provides comprehensive SVG sanitization capabilities.
So the code becomes:
use enshrined\svgSanitize\Sanitizer;
if (File::exists($file)) {
$sanitizer = new Sanitizer();
$dirtySVG = File::get($file);
$svg = $sanitizer->sanitize($dirtySVG);
break;
}
Reference
- https://github.com/gogs/gogs/security/advisories/GHSA-ff28-f46g-r9g8
- https://huntr.dev/bounties/34a12146-3a5d-4efc-a0f8-7a3ae04b198d/
- https://blog.nintechnet.com/wordpress-elementor-plugin-fixed-svg-xss-protection-bypass-vulnerability/
Severity ?
5.5 (Medium)
{
"affected": [
{
"package": {
"ecosystem": "Packagist",
"name": "statamic/cms"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.10.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-36828"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2023-07-06T20:56:28Z",
"nvd_published_at": "2023-07-05T22:15:10Z",
"severity": "MODERATE"
},
"details": "Antlers sanitizer cannot effectively sanitize malicious SVG\n\n### Summary\nThe SVG tag does not sanitize malicious SVG. Therefore, an attacker can exploit this vulnerability to perform XSS attacks using SVG, even when using the `sanitize` function.\n\n### Details\nRegarding the previous discussion mentioned [here](https://github.com/statamic/cms/security/advisories/GHSA-jvw9-rrc5-39g6#advisory-comment-84322), it has been identified that the default blacklist in the **FilesFieldtypeController** (located at this [link](https://github.com/statamic/cms/blob/f806b6b007ddcf066082eef175653c5beaa96d60/src/Http/Controllers/CP/Fieldtypes/FilesFieldtypeController.php#L15)) only blocks certain file extensions such as php, php3, php4, php5, and phtml. This allows a malicious user to upload a manipulated SVG file disguised as a social media icon, potentially triggering an XSS vulnerability.\n\n### PoC Screenshot\n\n\n### PoC\n1. Create new Global set, let\u0027s say \"Settings\"\n2. Create a \"Grid\" field in Blueprint (named: social), then add somefields Name (text), URL (text) and Icon (Assets) in the section Fields.\n3. When calling the social setting in the `_footer.antlers.html`, remember to [sanitize](https://statamic.dev/modifiers/sanitize)\n```\n{{ settings:social }}\n \u003ca href=\"{{ $url }}\" class=\"ml-4\" aria-label=\"{{ $name }}\" rel=\"noopener\"\u003e\n {{ svg :src=\"icon\" class=\"h-6 w-6 hover:text-hot-pink\" | sanitize }}\n \u003c/a\u003e\n{{ /settings:social }}\n```\n4. Upload the malicious SVG image, here is the code:\n```\n\u003c?xml version=\"1.0\" standalone=\"no\"?\u003e\n\u003c!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\"\u003e\n\n\u003csvg width=\"500\" height=\"500\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"\u003e\n \u003ctext x=\"20\" y=\"35\"\u003eStatamic\u003c/text\u003e\n \u003cforeignObject width=\"500\" height=\"500\"\u003e\n \u003ciframe xmlns=\"http://www.w3.org/1999/xhtml\" src=\"javascript:confirm(document.cookie);\" width=\"400\" height=\"250\"/\u003e\n \u003c/foreignObject\u003e\n\u003c/svg\u003e\n```\n\n\n\n### Impact\nSince the social media icon is displayed in the footer layout, any user can view it, potentially leading to the execution of XSS.\n\n### Suggestions to Mitigate or Resolve the Issue:\nSanitize when outputing the svg. This vulnerability caused by unsanitized `File::get()` when retrieving the SVG, it is crucial to sanitize the SVG when outputting it. The issue can be found in the following file: https://github.com/statamic/cms/blob/f806b6b007ddcf066082eef175653c5beaa96d60/src/Tags/Svg.php#L36-L40.\n\nIt is highly recommended to implement proper sanitization measures to ensure the security of the SVG content. One effective approach is to utilize a reliable package, such as https://github.com/darylldoyle/svg-sanitizer ,which provides comprehensive SVG sanitization capabilities.\n\nSo the code becomes:\n```php\nuse enshrined\\svgSanitize\\Sanitizer;\n\nif (File::exists($file)) {\n \n $sanitizer = new Sanitizer();\n $dirtySVG = File::get($file);\n\n $svg = $sanitizer-\u003esanitize($dirtySVG);\n break;\n}\n```\n\n### Reference\n- https://github.com/gogs/gogs/security/advisories/GHSA-ff28-f46g-r9g8\n- https://huntr.dev/bounties/34a12146-3a5d-4efc-a0f8-7a3ae04b198d/\n- https://blog.nintechnet.com/wordpress-elementor-plugin-fixed-svg-xss-protection-bypass-vulnerability/",
"id": "GHSA-6r5g-cq4q-327g",
"modified": "2023-07-06T20:56:28Z",
"published": "2023-07-06T20:56:28Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/statamic/cms/security/advisories/GHSA-6r5g-cq4q-327g"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-36828"
},
{
"type": "WEB",
"url": "https://github.com/statamic/cms/pull/8408"
},
{
"type": "WEB",
"url": "https://github.com/statamic/cms/commit/c714893ad92de6e5ede17b501003441af505b30d"
},
{
"type": "PACKAGE",
"url": "https://github.com/statamic/cms"
},
{
"type": "WEB",
"url": "https://github.com/statamic/cms/blob/f806b6b007ddcf066082eef175653c5beaa96d60/src/Http/Controllers/CP/Fieldtypes/FilesFieldtypeController.php#L15"
},
{
"type": "WEB",
"url": "https://github.com/statamic/cms/blob/f806b6b007ddcf066082eef175653c5beaa96d60/src/Tags/Svg.php#L36-L40"
},
{
"type": "WEB",
"url": "https://github.com/statamic/cms/releases/tag/v4.10.0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L",
"type": "CVSS_V3"
}
],
"summary": "Statamic\u0027s Antlers sanitizer cannot effectively sanitize malicious SVG"
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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