UBUNTU-CVE-2018-14028

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UBUNTU-CVE-2018-14028

Summary:

Details: In WordPress 4.9.7, plugins uploaded via the admin area are not verified as being ZIP files. This allows for PHP files to be uploaded. Once a PHP file is uploaded, the plugin extraction fails, but the PHP file remains in a predictable wp-content/uploads location, allowing for an attacker to then execute the file. This represents a security risk in limited scenarios where an attacker (who does have the required capabilities for plugin uploads) cannot simply place arbitrary PHP code into a valid plugin ZIP file and upload that plugin, because a machine's wp-content/plugins directory permissions were set up to block all new plugins.

References: https://ubuntu.com/security/CVE-2018-14028, https://core.trac.wordpress.org/ticket/44710, https://github.com/rastating/wordpress-exploit-framework/pull/52, https://rastating.github.io/unrestricted-file-upload-via-plugin-uploader-in-wordpress/, https://www.cve.org/CVERecord?id=CVE-2018-14028