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CVE-2021-38346— Brizy <= 2.3.11 Authenticated Unrestricted File Upload and Path Traversal

Quick assessment

Affected
Brizy.io Brizy - Page Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress是Wordpress基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。WordPress 插件是WordPress开源的一个应用插件。 WordPress Plugins 存在代码问题漏洞，该漏洞源于 Brizy Page Builder 插件允许经过身份验证的用户使用 brizy_create_block_screenshot AJAX 操作将可执行文件上传到他们选择的位置。文件将使用 id 参数命名，该参数可以在前面加上“../”以执

CVSS 8.8 · High EPSS 1.74% · P77
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I. Basic Information for CVE-2021-38346

Vulnerability Information
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Vulnerability Title
Brizy <= 2.3.11 Authenticated Unrestricted File Upload and Path Traversal
Source: CVE Program / CVE List V5
Vulnerability Description
The Brizy Page Builder plugin <= 2.3.11 for WordPress allowed authenticated users to upload executable files to a location of their choice using the brizy_create_block_screenshot AJAX action. The file would be named using the id parameter, which could be prepended with "../" to perform directory traversal, and the file contents were populated via the ibsf parameter, which would be base64-decoded and written to the file. While the plugin added a .jpg extension to all uploaded filenames, a double extension attack was still possible, e.g. a file named shell.php would be saved as shell.php.jpg, and would be executable on a number of common configurations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress 插件代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress是Wordpress基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。WordPress 插件是WordPress开源的一个应用插件。 WordPress Plugins 存在代码问题漏洞，该漏洞源于 Brizy Page Builder 插件允许经过身份验证的用户使用 brizy_create_block_screenshot AJAX 操作将可执行文件上传到他们选择的位置。文件将使用 id 参数命名，该参数可以在前面加上“../”以执
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Brizy.io Brizy - Page Builder 2.3.11 ~ 2.3.11 -

II. Public POCs for CVE-2021-38346

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III. Intelligence Information for CVE-2021-38346

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Vendor Advisories for CVE-2021-38346 (1)

Same Patch Batch · Brizy.io · 2021-10-14 · 3 CVEs total

CVE-2021-38345 7.1 HIGH Brizy <= 1.0.125 and 1.0.127 – 2.3.11 Incorrect authorization checks allowing Post modific
CVE-2021-38344 6.4 MEDIUM Brizy <= 2.3.11 Authenticated Stored Cross-Site Scripting

IV. Related Vulnerabilities

Same product: Brizy - Page Builder
Same vendor: Brizy.io
Same weakness: CWE-79

V. Comments for CVE-2021-38346

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