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Cross-site Scripting occurrences in Digdash

An issue was discovered in DigDash 2018R2 before p20200528, 2019R1 before p20200528, 2019R2 before p20200430, and 2020R1 before p20200507. A cross-site scripting (XSS) vulnerability exists in the login menu. (2020-06-15, CVE-2020-13652)

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>

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