Rapid7 Advisory R7-0026 - HTTP Header Injection Vulnerabilities in the Flash Player Plugin. Two HTTP Header Injection vulnerabilities have been discovered by Rapid7 in the Flash Player plugin. They allow attackers to perform arbitrary HTTP requests while controlling most of the HTTP headers. This can make it easier to perform CSRF attacks [2] in some cases. When the HTTP server implements Keep-Alive connections and when Firefox is used, these Flash vulnerabilities can even be used to perform totally arbitrary HTTP requests where every part is controlled by the attacker: HTTP method, URI, HTTP version, headers, and data. Such attacks make use of the HTTP Request Splitting method.
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