Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata

The Everest Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.4.3 via deserialization of untrusted input from form entry metadata. This is due to the html-admin-page-entries-view.php file calling PHP's native unserialize() on stored entry meta values without passing the allowed_classes parameter. This makes it possible for unauthenticated attackers to inject a serialized PHP object payload through any public Everest Forms form field. The payload survives sanitize_text_field() sanitization (serialization control characters are not stripped) and is stored in the wp_evf_entrymeta database table. When an administrator views entries or views an individual entry, the unsafe unserialize() call processes the stored data without class restrictions.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

可信数据的反序列化

WordPress plugin Everest Forms 代码问题漏洞

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Everest Forms 3.4.3及之前版本存在代码问题漏洞，该漏洞源于对来自表单条目元数据的不可信输入进行反序列化，可能导致未经身份验证的攻击者注入序列化的PHP对象有效载荷，从而引发PHP对象注入攻击。

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