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Cross-site Scripting occurrences in Directories Pro
A cross-site scripting (XSS) vulnerability exists in the SabaiApps WordPress Directories Pro plugin version 1.3.45 and previous, allows attackers who have convinced a site administrator to import a specially crafted CSV file to inject arbitrary web script or HTML as the victim is proceeding through the file import workflow. (2020-12-14, CVE-2020-29304)
A cross-site scripting (XSS) vulnerability in the SabaiApp Directories Pro plugin 1.3.45 for WordPress allows remote attackers to inject arbitrary web script or HTML via a POST to /wp-admin/admin.php?page=drts/directories&q=%2F with _drts_form_build_id parameter containing the XSS payload and _t_ parameter set to an invalid or non-existent CSRF token. (2020-12-14, CVE-2020-29303)
Why Cross-site Scripting can be dangerous
Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.
The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:
https://server.com/confirmation?message=Transaction+Complete
what results in:
<span>Confirmation: Transaction Complete</span>
In that case the message can be modified to become a valid Javascript code, e.g.:
https://server.com/confirmation?message=<script>dangerous javascript code here</script>
and it will be executed locally by the user's browser with full access to the user's personal application/browser data:
<span>Confirmation: <script>dangerous javascript code here</script></span>