CVE-2024-43236

Easy PayPal Buy Now Button <= 1.9 - Unauthenticated Open Redirect

2024-08-09 00:00
stealthcopter

Strategic Overview

Status
Patched in 1.9.1
Affected Plugin
Easy PayPal & Stripe Buy Now Button
Affected Version
<= 1.9
CVSS
7.2High
Weakness type
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE
CVE-2024-43236
View all Easy PayPal & Stripe Buy Now Button vulnerabilities

At a glance

CVE-2024-43236 is a high-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the Easy PayPal & Stripe Buy Now Button WordPress plugin, affecting versions <= 1.9. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.9.1; sites on affected versions should update now. Disclosed August 2024, reported by stealthcopter.

Vulnerability Overview

The Easy PayPal & Stripe Buy Now Button plugin for WordPress is vulnerable to Open Redirect in all versions up to, and including, 1.9. This is due to insufficient validation on the redirect url supplied via the 'rf' parameter. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites if they can successfully trick them into performing an action.

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-601: URL Redirection to Untrusted Site ('Open Redirect')

Reaching this weakness in Easy PayPal & Stripe Buy Now Button <= 1.9 takes no account at all. 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 Easy PayPal & Stripe Buy Now Button the fix is 1.9.1: builds <= 1.9 are affected, anything from 1.9.1 onward is not.

Remediation

Update to version 1.9.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Easy PayPal & Stripe Buy Now Button 1.9.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-43236https://www.wordfence.com/threat-intel/vulnerabilities/id/a9d11f3a-eb28-4a80-8970-8ad05284a5b4https://nvd.nist.gov/vuln/detail/CVE-2024-43236

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C