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Cross-site Scripting occurrences in Metasploit
Cross-site Scripting (XSS) vulnerability in the 'host' field of a discovered scan asset in Rapid7 Metasploit Pro allows an attacker with a specially-crafted network service of a scan target to store an XSS sequence in the Metasploit Pro console, which will trigger when the operator views the record of that scanned host in the Metasploit Pro interface. This issue affects Rapid7 Metasploit Pro version 4.17.1-20200427 and prior versions, and is fixed in Metasploit Pro version 4.17.1-20200514. See also CVE-2020-7355, which describes a similar issue, but involving the generated 'notes' field of a discovered scan asset. (2020-06-25, CVE-2020-7354)
Cross-site Scripting (XSS) vulnerability in the 'notes' field of a discovered scan asset in Rapid7 Metasploit Pro allows an attacker with a specially-crafted network service of a scan target store an XSS sequence in the Metasploit Pro console, which will trigger when the operator views the record of that scanned host in the Metasploit Pro interface. This issue affects Rapid7 Metasploit Pro version 4.17.1-20200427 and prior versions, and is fixed in Metasploit Pro version 4.17.1-20200514. See also CVE-2020-7354, which describes a similar issue, but involving the generated 'host' field of a discovered scan asset. (2020-06-25, CVE-2020-7355)
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>