Arbitrary file upload in Ultimate Member – User Profile & Membership Plugin for WordPress

1) Arbitrary file upload

EUVDB-ID: #VU19650

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: N/A

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file extension when uploading files. A remote attacker can upload and execute arbitrary file on the system.

Mitigation

Update to version 2.0.22.

Vulnerable software versions

Ultimate Member - User Profile & Membership Plugin: 1.0.0 - 2.0.21

CPE2.3

• cpe:2.3:a:ultimatemember:ultimate-member:1.0.0:*:*:*:*:wordpress:*:*
• cpe:2.3:a:ultimatemember:ultimate-member:1.0.10:*:*:*:*:wordpress:*:*
• cpe:2.3:a:ultimatemember:ultimate-member:1.0.15:*:*:*:*:wordpress:*:*

External links

https://wordpress.org/support/topic/appears-um-got-hacked-on-my-site/
https://wordpress.org/support/topic/danger-security-issue/
https://plugins.trac.wordpress.org/changeset/1922149/ultimate-member

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?

No. We are not aware of malware exploiting this vulnerability.