A mechanism to inject static HTML into the RSS reader preview page due to a failure to escape characters sent as URL parameters for a feed's "TITLE" element. This vulnerability allows for spoofing but no scripted content can be run. This vulnerability affects Firefox < 53.
Mecanismo para inyectar HTML estático en la página de previsualización del lector RSS debido a un error a la hora de escapar caracteres enviados como parámetros de URL para un elemento "TITLE" de un feed. Esta vulnerabilidad permite la suplantación, pero no se puede ejecutar el contenido que no esté en script. La vulnerabilidad afecta a Firefox en versiones anteriores a la 53.
USN-3260-1 fixed vulnerabilities in Firefox. The update caused the date picker panel and form validation errors to close immediately on opening. This update fixes the problem. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to read uninitialized memory, obtain sensitive information, spoof the addressbar contents or other UI elements, escape the sandbox to read local files, conduct cross-site scripting attacks, cause a denial of service via application crash, or execute arbitrary code. A flaw was discovered in the DRBG number generation in NSS. If an attacker were able to perform a man-in-the-middle attack, this flaw could potentially be exploited to view sensitive information. Various other issues were also addressed.
