CVE-2021-24325

404 SEO Redirection <= 1.3 - Reflected Cross-Site Scripting

2021-04-16 00:00

Strategic Overview

Status: Patched in 1.4
Affected Plugin: 404 SEO Redirection
Affected Version: <= 1.3
CVSS: 6.1Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24325

View all 404 SEO Redirection vulnerabilities

At a glance

CVE-2021-24325 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the 404 SEO Redirection WordPress plugin, affecting versions <= 1.3. 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 1.4; sites on affected versions should update now. Disclosed April 2021, reported by R3N0.

Vulnerability Overview

The tab parameter of the settings page of the 404 SEO Redirection WordPress plugin through 1.3 is vulnerable to a reflected Cross-Site Scripting (XSS) issue as user input is not properly sanitised or escaped before being output in an attribute.

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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in 404 SEO Redirection <= 1.3 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For 404 SEO Redirection the fix is 1.4: builds <= 1.3 are affected, anything from 1.4 onward is not.

Remediation

Update to version 1.4, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to 404 SEO Redirection: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: 404 SEO Redirection 1.4 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24325 https://www.wordfence.com/threat-intel/vulnerabilities/id/5d6bebb7-375c-45b8-9b54-58c6dbc0bb70 https://nvd.nist.gov/vuln/detail/CVE-2021-24325

Related records

Other vulnerabilities in 404 SEO Redirection

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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