Easy PayPal Buy Now Button <= 1.7.2 - Cross-Site Request Forgery to Cross-Site Scripting

2017-06-12 00:00
Anonymous

Strategic Overview

Status
Patched in 1.7.3
Affected Plugin
Easy PayPal & Stripe Buy Now Button
Affected Version
< 1.7.3
CVSS
5.4Medium
Weakness type
CWE-352 · Cross-Site Request Forgery (CSRF)
CVE
CVE pending
View all Easy PayPal & Stripe Buy Now Button vulnerabilities

At a glance

This record tracks a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Easy PayPal & Stripe Buy Now Button WordPress plugin, affecting versions < 1.7.3. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.7.3; sites on affected versions should update now. Disclosed June 2017.

Vulnerability Overview

The Easy PayPal Buy Now Button plugin for WordPress is vulnerable to Cross-Site Request Forgery to Cross-Site Scripting in versions up to, and including, 1.7.2. This is due to missing or incorrect nonce validation on the wpecpp_settingsoptions function. This makes it possible for unauthenticated attackers to inject malicious JavaScript, that will execute whenever a user accesses the /wp-admin/options-general.php?page=wp-ecommerce-setting page, via forged request granted they can trick a site administrator into performing an action such as clicking on a link.

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-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Easy PayPal & Stripe Buy Now Button < 1.7.3 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Easy PayPal & Stripe Buy Now Button the fix is 1.7.3: builds < 1.7.3 are affected, anything from 1.7.3 onward is not.

Remediation

Update to version 1.7.3, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Easy PayPal & Stripe Buy Now Button: 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 1.7.3 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/80ae05c4-64de-48df-b302-6110403b79d0

Related records

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