CVE-2018-19796

Ninja Forms Contact Form <= 3.3.19 - Authenticated Open Redirect

2018-12-01 00:00

Strategic Overview

Status: Patched in 3.3.19.1
Affected Plugin: Ninja Forms – The Contact Form Builder That Grows With You
Affected Version: <= 3.3.19
CVSS: 4.7Medium
Weakness type: CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE: CVE-2018-19796

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

At a glance

CVE-2018-19796 is a medium-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the Ninja Forms WordPress plugin, affecting versions <= 3.3.19. It carries a CVSS score of 4.7 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.3.19.1; sites on affected versions should update now. Disclosed December 2018, reported by MTK (Muhammad Talha Khan).

Vulnerability Overview

An open redirect in the Ninja Forms plugin before 3.3.19.1 for WordPress allows Remote Attackers to redirect a user via the lib/StepProcessing/step-processing.php (aka submissions download page) redirect parameter.

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 <= 3.3.19 takes any authenticated account. 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 3.3.19.1: builds <= 3.3.19 are affected, anything from 3.3.19.1 onward is not.

Remediation

Update to version 3.3.19.1, 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 3.3.19.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-19796 https://www.wordfence.com/threat-intel/vulnerabilities/id/221f9cbb-7988-4671-8f14-da3e63c280e6 https://nvd.nist.gov/vuln/detail/CVE-2018-19796

Related records

Same weakness class

6.1CVE-2021-24165: Ninja Forms Contact Form Administrator Open RedirectCVE-2021-24165

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

CVSS Vector

4.7

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

Base

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

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