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Cross-site Scripting occurrences in Electricflow
A reflected cross site scripting vulnerability in Jenkins ElectricFlow Plugin 1.1.6 and earlier allowed attackers able to control the output of the ElectricFlow API to inject arbitrary HTML and JavaScript in job configuration forms containing post-build steps provided by this plugin. (2019-06-11, CVE-2019-10336)
A stored cross site scripting vulnerability in Jenkins ElectricFlow Plugin 1.1.5 and earlier allowed attackers able to configure jobs in Jenkins or control the output of the ElectricFlow API to inject arbitrary HTML and JavaScript in the plugin-provided output on build status pages. (2019-06-11, CVE-2019-10335)
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>