UBUNTU-CVE-2018-12895

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UBUNTU-CVE-2018-12895

Summary:

Details: WordPress through 4.9.6 allows Author users to execute arbitrary code by leveraging directory traversal in the wp-admin/post.php thumb parameter, which is passed to the PHP unlink function and can delete the wp-config.php file. This is related to missing filename validation in the wp-includes/post.php wp_delete_attachment function. The attacker must have capabilities for files and posts that are normally available only to the Author, Editor, and Administrator roles. The attack methodology is to delete wp-config.php and then launch a new installation process to increase the attacker's privileges.

References: https://ubuntu.com/security/CVE-2018-12895, https://blog.ripstech.com/2018/wordpress-file-delete-to-code-execution/, https://www.cve.org/CVERecord?id=CVE-2018-12895