Arbitrary file upload in File Manager plugin for WordPress

1) Arbitrary file upload

EUVDB-ID: #VU46202

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: CVE-2020-25213

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload in wp-file-manager in the "lib/php/connector.minimal.php" and "lib/files/hardfork.php" files. A remote attacker can upload a malicious file and execute it on the server.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

File Manager: 6.4 - 6.8

External links

http://wpvulndb.com/vulnerabilities/10389/
http://blog.nintechnet.com/critical-zero-day-vulnerability-fixed-in-wordpress-file-manager-700000-i...
http://blog.sucuri.net/2020/09/critical-vulnerability-file-manager-affecting-700k-wordpress-website...

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.