Ampache Cross-site Scripting

Ampache is an open source web based audio/video streaming application and file manager. Due to a lack of input filtering versions 4.x.y are vulnerable to code injection in random.php. The attack requires user authentication to access the random.php page unless the site is running in demo mode. This issue has been resolved in 4.4.3. (2021-06-22, CVE-2021-32644)

An issue was discovered in Ampache through 3.9.1. A stored XSS exists in the localplay.php LocalPlay "add instance" functionality. The injected code is reflected in the instances menu. This vulnerability can be abused to force an admin to create a new privileged user whose credentials are known by the attacker. (2019-08-22, CVE-2019-12386)

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>