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Wordpress: CVE-2018-12895: Wordpress Authenticated Arbitrary File Deletion

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Wordpress: CVE-2018-12895: Wordpress Authenticated Arbitrary File Deletion

Severity
7
CVSS
(AV:N/AC:L/Au:S/C:P/I:P/A:P)
Published
06/26/2018
Created
03/19/2019
Added
08/24/2018
Modified
11/26/2021

Description

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.

Solution(s)

  • wordpress-upgrade-4_9_7

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