Via Brad Neuberg: RSnake’s XSS (Cross Site Scripting) Cheatsheet: Esp: for filter evasion.
Limitations on cross site scripting (XSS hereafter) have been troubling me as I try to write enhancements to our library catalog, but the reasons for the prohibition are sound. Without them I could snort your browser cookies (RSnake lists: “cookie/credential stealing/replay/session riding” among the threats, but a well-planned attack could also fetch resources from internal webservers and deliver them to external data thieves).
It turns out you can insert JavaScript in <img> tags (among many, many others) and obfuscate it with Unicode, hex, and other less-readable encodings or by inserting tab characters (“	”) or newlines (“
”). It would be impossible for me to list every possible attack vector, but RSnake takes a good stab at it.
If you allow users to insert HTML in comments, you should be aware of this….
tags: browser threats, cheatsheet, cross site javascript, cross site scripting, filter evasion, internet threats, javascript, scripting, threat, threats, web, web browser, xss
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