CVE-2023-0816

Formidable Forms <= 6.0.1 - IP Spoofing via HTTP header

2023-03-06 00:00

Strategic Overview

Status: Patched in 6.1
Affected Plugin: Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More
Affected Version: <= 6.0.1
CVSS: 5.3Medium
Weakness type: CWE-807 · Reliance on Untrusted Inputs in a Security Decision
CVE: CVE-2023-0816

View all Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More vulnerabilities

At a glance

CVE-2023-0816 is a medium-severity Reliance on Untrusted Inputs in a Security Decision vulnerability in the Formidable Forms WordPress plugin, affecting versions <= 6.0.1. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 6.1; sites on affected versions should update now. Disclosed March 2023, reported by Daniel Ruf.

Vulnerability Overview

The Formidable Forms plugin for WordPress is vulnerable to IP Spoofing in versions up to, and including, 6.0.1 due to a reliance on various untrusted headers (e.g., 'Client-Ip', 'CF-CONNECTING-IP', etc.) to retrieve the IP address of a client performing a form submission. This makes it possible for unauthenticated users to bypass the plugin's anti-spam protections.

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, and no interaction from a victim user.

CWE-807: Reliance on Untrusted Inputs in a Security Decision

The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.

Remediation

Update to version 6.1, or a newer patched version

How does WordSec protect against this?

The fix is the thing that ends this: Formidable Forms 6.1 closes this, and updating the plugin is the step that ends it.

Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-0816 https://www.wordfence.com/threat-intel/vulnerabilities/id/909b5421-210d-427a-94a0-e1ea25880cec https://nvd.nist.gov/vuln/detail/CVE-2023-0816

Related records

Other vulnerabilities in Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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