Insecure deserialization in Easy WP SMTP plugin for WordPress

1) Deserialization of Untrusted Data

EUVDB-ID: #VU18078

Risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: No

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Easy WP SMTP: 1.0.1 - 1.3.9

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.