Deserialization of Untrusted Data in Easy WP SMTP - #VU18078

Detailed vulnerability description

The vulnerability allows a remote attacker to compromise vulnerable website.

The vulnerability exists due to insecure input validation when processing serialized data passed via the "swpsmtp_import_settings" HTTP POST parameter to /easy-wp-smtp.php script. A remote unauthenticated attacker can import arbitrary wp_options and reconfigure WordPress to allow user registration with administrative privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable website.

Note: this vulnerability is being actively exploited in the wild.

Remediation

Sources

• https://wordpress.org/support/topic/vulnerability-26/
• https://blog.nintechnet.com/critical-0day-vulnerability-fixed-in-wordpress-easy-wp-smtp-plugin/
• https://wpvulndb.com/vulnerabilities/9237/