PHP file upload bypass via Plugin installer

WordPress is an open publishing platform for the Web. It's possible for a file of a type other than a zip file to be submitted as a new plugin by an administrative user on the Plugins -> Add New -> Upload Plugin screen in WordPress. If FTP credentials are requested for installation (in order to move the file into place outside of the `uploads` directory) then the uploaded file remains temporary available in the Media Library despite it not being allowed. If the `DISALLOW_FILE_EDIT` constant is set to `true` on the site _and_ FTP credentials are required when uploading a new theme or plugin, then this technically allows an RCE when the user would otherwise have no means of executing arbitrary PHP code. This issue _only_ affects Administrator level users on single site installations, and Super Admin level users on Multisite installations where it's otherwise expected that the user does not have permission to upload or execute arbitrary PHP code. Lower level users are not affected. Sites where the `DISALLOW_FILE_MODS` constant is set to `true` are not affected. Sites where an administrative user either does not need to enter FTP credentials or they have access to the valid FTP credentials, are not affected. The issue was fixed in WordPress 6.4.3 on January 30, 2024 and backported to versions 6.3.3, 6.2.4, 6.1.5, 6.0.7, 5.9.9, 5.8.9, 5.7.11, 5.6.13, 5.5.14, 5.4.15, 5.3.17, 5.2.20, 5.1.18, 5.0.21, 4.9.25, 2.8.24, 4.7.28, 4.6.28, 4.5.31, 4.4.32, 4.3.33, 4.2.37, and 4.1.40. A workaround is available. If the `DISALLOW_FILE_MODS` constant is defined as `true` then it will not be possible for any user to upload a plugin and therefore this issue will not be exploitable.

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

危险类型文件的不加限制上传

WordPress 安全漏洞

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存在安全漏洞，该漏洞源于允许攻击者绕过插件安装程序上传PHP文件。受影响的产品和版本：WordPress 6.4.3之前版本，6.3.3之前版本，6.2.4之前版本，6.1.5之前版本，6.0.7之前版本，5.9.9之前版本，5.8.9之前版本，5.7.11之前版本，5.6.13之前版本，5.5.14之前版本，5.4.15之前版本，5.3.17之前版

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