The Reader View implementation in Mozilla Firefox before 42.0 has an improper whitelist, which makes it easier for remote attackers to bypass the Content Security Policy (CSP) protection mechanism and conduct cross-site scripting (XSS) attacks via vectors involving SVG animations and the about:reader URL.
La implementación Reader View en Mozilla Firefox en versiones anteriores a 42.0 tiene una lista blanca inadecuada, lo que hace que sea más fácil para atacantes remotos eludir el mecanismo de protección Content Security Policy (CSP) y realizar ataques cross-site scripting (XSS) a través de vectores involucrados con animaciones SVG y la URL about:reader.
Christian Holler, David Major, Jesse Ruderman, Tyson Smith, Boris Zbarsky, Randell Jesup, Olli Pettay, Karl Tomlinson, Jeff Walden, Gary Kwong, Andrew McCreight, Georg Fritzsche, and Carsten Book discovered multiple memory safety issues in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. Various other issues were also addressed.
