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This morning I woke up to a JavaScript alert on a project of mine that runs KnockoutJS, jQuery, and Underscore.js. It says “I can run any JavaScript of my choice on your users’ browsers”. The only third-party JavaScript I am downloading is Typekit, and removing that does not make this go away. I’ve searched my JavaScript and vendor JavaScript and this string does not come back up matching anything.
How would you troubleshoot this and/or is this something that is known to occur?
If you have a database for your application, that would be the next place to check. I’m guessing somebody found and exploited an Injection vulnerability (either un-sanitized HTML input or SQL) and injected the script into a page via the database.
The last place would be to look at the ruby code to see if somehow a malicious user modified your source.