This article is a part of our Vulnerability Database (back to index)
Cross-site Scripting occurrences in Config File Provider
An cross-site scripting vulnerability exists in Jenkins Config File Provider Plugin 3.4.1 and earlier in src/main/resources/lib/configfiles/configfiles.jelly that allows attackers with permission to define shared configuration files to execute arbitrary JavaScript when a user attempts to delete the shared configuration file. (2019-02-06, CVE-2019-1003014)
A cross-site scripting vulnerability exists in Jenkins Config File Provider Plugin 3.1 and earlier in configfiles.jelly, providerlist.jelly that allows users with the ability to configure configuration files to insert arbitrary HTML into some pages in Jenkins. (2019-01-09, CVE-2018-1000413)
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>