CVE-2021-36913

Redirection for Contact Form 7 <= 2.4.0 - Missing Authorization

2022-09-29 00:00

Strategic Overview

Status: Patched in 2.7.0
Affected Plugin: Redirection for Contact Form 7
Affected Version: <= 2.4.0
CVSS: 5.3Medium
Weakness type: CWE-862 · Missing Authorization
CVE: CVE-2021-36913

View all Redirection for Contact Form 7 vulnerabilities

At a glance

CVE-2021-36913 is a medium-severity Missing Authorization vulnerability in the Redirection for Contact Form 7 WordPress plugin, affecting versions <= 2.4.0. 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 2.7.0; sites on affected versions should update now. Disclosed September 2022, reported by mirphak.

Vulnerability Overview

The Redirection for Contact Form 7 plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on an unknown function in versions up to, and including, 2.4.0. This makes it possible for unauthenticated attackers to update the plugin's options.

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-862: Missing Authorization

Reaching this weakness in Redirection for Contact Form 7 <= 2.4.0 takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Redirection for Contact Form 7 the fix is 2.7.0: builds <= 2.4.0 are affected, anything from 2.7.0 onward is not.

Remediation

Update to version 2.7.0, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Redirection for Contact Form 7 2.7.0 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-36913 https://www.wordfence.com/threat-intel/vulnerabilities/id/752b9c5f-4c36-4182-9dd4-0e840a727ceb https://nvd.nist.gov/vuln/detail/CVE-2021-36913

Related records

Same weakness class

Other vulnerabilities in Redirection for Contact Form 7

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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