CVE-2021-24165

Ninja Forms Contact Form <= 3.4.33 - Administrator Open Redirect

2021-02-16 00:00

Strategic Overview

Status: Patched in 3.4.34
Affected Plugin: Ninja Forms – The Contact Form Builder That Grows With You
Affected Version: < 3.4.34
CVSS: 6.1Medium
Weakness type: CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE: CVE-2021-24165

View all Ninja Forms – The Contact Form Builder That Grows With You vulnerabilities

At a glance

CVE-2021-24165 is a medium-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the Ninja Forms WordPress plugin, affecting versions < 3.4.34. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.4.34; sites on affected versions should update now. Disclosed February 2021, reported by Chloe Chamberland.

Vulnerability Overview

In the Ninja Forms Contact Form WordPress plugin before 3.4.34, the wp_ajax_nf_oauth_connect AJAX action was vulnerable to open redirect due to the use of a user supplied redirect parameter and no protection in place.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

Reaching this weakness in Ninja Forms < 3.4.34 takes a caller who can reach the endpoint. An open redirect is a page that takes a destination from the request and sends the browser there without checking that the destination belongs to the site.

A link that starts on a trusted domain finishes on an attacker's, which is what makes phishing and consent-screen abuse credible to the person clicking it. For Ninja Forms the fix is 3.4.34: builds < 3.4.34 are affected, anything from 3.4.34 onward is not.

Remediation

Update to version 3.4.34, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Ninja Forms: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Ninja Forms 3.4.34 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24165 https://www.wordfence.com/threat-intel/vulnerabilities/id/13ba9152-b9a0-4201-ba91-c41686b4d953 https://nvd.nist.gov/vuln/detail/CVE-2021-24165

Related records

Same weakness class

4.7CVE-2018-19796: Ninja Forms Contact Form <= 3.3.19 Open RedirectCVE-2018-19796

Other vulnerabilities in Ninja Forms – The Contact Form Builder That Grows With You

CVSS Vector

6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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