Multiple vulnerabilities in Ninja Forms plugin for WordPress

Published: 2021-09-24

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-34648 CVE-2021-34647
CWE-ID	CWE-20 CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress Web applications / Modules and components for CMS
Vendor	The WP Ninjas

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU56846

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34648

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied input in the "trigger_email_action" function in the ~/includes/Routes/Submissions.php file. A remote authenticated attacker can use a specially crafted email to socially engineer victims.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress: 3.0 - 100

External links

http://www.wordfence.com/blog/2021/09/recently-patched-vulnerabilities-in-ninja-forms-plugin-affects-over-1-million-site-owners/
http://plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/Routes/Submissions.php?rev=2543837#L155

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Information disclosure

EUVDB-ID: #VU56847

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34647

CWE-ID: CWE-200 - Information exposure