Insane in the IFRAME -- The case for client-side HTML sanitization

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Presented at OWASPAppSecEU 2013 by

David Ross

Server-side HTML sanitization is a familiar web application building block, yet despite years of offensive security research, defensive “sanitizer science” is still a kind of voodoo magic. This talk will make the case that as server-side HTML sanitizers lack the ability to effectively simulate every potential user agent, the client itself is the only party empowered to perform accurate sanitization. We will examine the DOM API primitives required to perform such client-side sanitization and review results and learning from a prototype implementation.