#VU24502 Improper access control in Ultimate Member - User Profile & Membership Plugin - CVE-2020-6859

Vulnerability identifier: #VU24502

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-6859

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ultimate Member - User Profile & Membership Plugin
Web applications / Modules and components for CMS

Vendor: Ultimate Member

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to Insecure Direct Object Reference (IDOR) issue in includes/core/class-files.php. A remote attacker can bypass implemented security restrictions and change other users' profiles and cover photos via a modified "user_id" parameter. This is related to "ajax_image_upload" and "ajax_resize_image".

.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Ultimate Member - User Profile & Membership Plugin: 1.0.0 - 2.1.2

---

External links
https://github.com/ultimatemember/ultimatemember/blob/627bbb0fae81ac34c60b43f0867eadcf8e1bc523/includes/core/class-files.php#L269
https://github.com/ultimatemember/ultimatemember/blob/627bbb0fae81ac34c60b43f0867eadcf8e1bc523/includes/core/class-files.php#L310
https://github.com/ultimatemember/ultimatemember/commit/249682559012734a4f7d71f52609b2f301ea55b1
https://wordpress.org/plugins/ultimate-member/#developers
https://wpvulndb.com/vulnerabilities/10041

---

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.