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Cross-site Scripting occurrences in Moveit Transfer
In Progress MOVEit Transfer before 2020.1, a malicious user could craft and store a payload within the application. If a victim within the MOVEit Transfer instance interacts with the stored payload, it could invoke and execute arbitrary code within the context of the victim's browser (XSS). (2020-11-17, CVE-2020-28647)
In Progress MOVEit Transfer 2019.1 before 2019.1.4 and 2019.2 before 2019.2.1, a REST API endpoint failed to adequately sanitize malicious input, which could allow an authenticated attacker to execute arbitrary code in a victim's browser, aka XSS. (2020-02-14, CVE-2020-8612)
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>