On pages containing an iframe, the "data:" protocol can be used to create a modal dialog through Javascript that will have an arbitrary domains as the dialog's location, spoofing of the origin of the modal dialog from the user view. Note: This attack only affects installations with e10 multiprocess turned off. Installations with e10s turned on do not support the modal dialog functionality. This vulnerability affects Firefox < 56.
En las páginas que contienen un iframe, se podría utilizar el protocolo "data:" para crear un diálogo modal mediante JavaScript que tendría un dominio arbitrario como la ubicación del diálogo, suplantando el origen del diálogo modal desde la vista del usuario. Nota: Este ataque solo afecta a las instalaciones con multiprocesos e10 desactivadas. Las intalaciones con e10 activado no soporta la funcionalidad de dialogo modal. Esta vulnerabilidad afecta a las versiones anteriores a la 56 de Firefox.
USN-3435-1 fixed vulnerabilities in Firefox. The update caused the Flash plugin to crash in some circumstances. 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, bypass phishing and malware protection, spoof the origin in modal dialogs, conduct cross-site scripting attacks, cause a denial of service via application crash, or execute arbitrary code. Martin Thomson discovered that NSS incorrectly generated handshake hashes. A remote attacker could potentially exploit this to cause a denial of service via application crash, or execute arbitrary code. Multiple security issues were discovered in WebExtensions. If a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit these to download and open non-executable files without interaction, or obtain elevated privileges. Various other issues were also addressed.
