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Cross-site Scripting occurrences in Jasperreports Library
The report generator component of TIBCO Software Inc.'s TIBCO JasperReports Library, TIBCO JasperReports Library for ActiveMatrix BPM, TIBCO JasperReports Server, TIBCO JasperReports Server for AWS Marketplace, and TIBCO JasperReports Server for ActiveMatrix BPM contains a vulnerability that theoretically allows an attacker to exploit HTML injection to gain full control of a web interface containing the output of the report generator component with the privileges of any user that views the affected report(s). The attacker can theoretically exploit this vulnerability when other users view a maliciously generated report, where those reports use Fusion Charts and a data source with contents controlled by the attacker. Affected releases are TIBCO Software Inc.'s TIBCO JasperReports Library: versions 7.1.1 and below, versions 7.2.0 and 7.2.1, version 7.3.0, version 7.5.0, TIBCO JasperReports Library for ActiveMatrix BPM: versions 7.1.1 and below, TIBCO JasperReports Server: versions 7.1.1 and below, version 7.2.0, version 7.5.0, TIBCO JasperReports Server for AWS Marketplace: versions 7.5.0 and below, and TIBCO JasperReports Server for ActiveMatrix BPM: versions 7.1.1 and below. (2020-05-20, CVE-2020-9410)
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>