CVE-2021-24327

SEO Redirection <= 6.4 - Authenticated Stored Cross-Site Scripting

2021-04-16 00:00

Strategic Overview

Status: Patched in 7.1
Affected Plugin: SEO Redirection Plugin – 301 Redirect Manager
Affected Version: <= 6.4
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24327

View all SEO Redirection Plugin – 301 Redirect Manager vulnerabilities

At a glance

CVE-2021-24327 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the SEO Redirection Plugin WordPress plugin, affecting versions <= 6.4. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 7.1; sites on affected versions should update now. Disclosed April 2021, reported by R3N0.

Vulnerability Overview

The SEO Redirection Plugin – 301 Redirect Manager WordPress plugin before 7.1 did not sanitise the Redirect From and Redirect To fields when creating a new redirect in the dashboard, allowing high privilege users (even with the unfiltered_html disabled) to set XSS payloads

Technical Analysis

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

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

Reaching this weakness in SEO Redirection Plugin <= 6.4 takes any authenticated account. 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 SEO Redirection Plugin the fix is 7.1: builds <= 6.4 are affected, anything from 7.1 onward is not.

Remediation

Update to version 7.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to SEO Redirection Plugin: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: SEO Redirection Plugin 7.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24327 https://www.wordfence.com/threat-intel/vulnerabilities/id/29d962c0-31dc-4320-a9ce-3ed71d4f9943 https://nvd.nist.gov/vuln/detail/CVE-2021-24327

Related records

Same weakness class

Other vulnerabilities in SEO Redirection Plugin – 301 Redirect Manager

CVSS Vector

4.8

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

Base

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

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