Headline
CVE-2022-2515: Wordpress Simple Banner <= 2.11.0 Plugin Multiple vulnerabilities
The Simple Banner plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the pro_version_activation_code parameter in versions up to, and including, 2.11.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, including those without administrative capabilities when access is granted to those users, to inject arbitrary web scripts in page that will execute whenever a user role having access to “Simple Banner” accesses the plugin’s settings.
Exploit Author: Muhammad Zeeshan (Xib3rR4dAr)
Vulnerable Plugin: Simple Banner
Plugin Slug: simple-banner
Active Plugin Installations: 50,000+
Vulnerable Version: <= 2.11.0 (latest version as of discovery)
Tested on: Wordpress v6.0.1
Vulnerability: Authenticated Stored XSS
Discovery date: July 19, 2022 Fix: Update plugin to version 2.12.0 or higher
Proof of Concept:
Login as admin and visit: http://127.0.0.1/wp-admin/admin.php?page=simple-banner-settings
>> In “Activation Code” field enter XSS payload as HoverHere" onmouseover=alert(1) a
>> Click Save Changes
Stored XSS will trigger when any user having ability to manage “Simple Banner” visits: http://127.0.0.1/wp-admin/admin.php?page=simple-banner-settings and hovers on “Activation Code” text box.
User input is escaped by escaping quotes with backslash, that doesnot prevent XSS in html context. Instead, user input should be sanitized or HTML entities be encoded before displaying to user.
This vulnerability can be exploited by any user with any role even by subscriber if subscriber is given permissions to use the plugin. Therefore a subscriber user can exploit XSS to perform actions on behalf of other users.
Furthermore plugin has option to allow users of any role to access “Simple Banner” plugin. Other vulnerability classified as problematic is that, when using the plugin, an admin can allow any role to access the plugin.
Expected behavior of feature: Role would be able to access “Simple Banner” plugin only
Actual Behavior: Role can access other plugins also other than "Simple Banner".
Admin would think that role would only be able to access “Simple Banner” but the role in actual would be able to access other plugins also since it adds capability of managing roles to users.
Before allowing subscriber to access "Simple banner": (No plugin accessible to a user with subscriber role)
After allowing subscriber to access "Simple banner": (Plugins other than “Simple Banner” also accessible to subscriber)
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