If web content on a page is dragged onto portions of the browser UI, such as the tab bar, links can be opened that otherwise would not be allowed to open. This can allow malicious web content to open a locally stored file through "file:" URLs. This vulnerability affects Firefox < 56.
Si el contenido web en una página se arrastra a porciones de la interfaz de usuario del navegador como una barra de pestañas, los enlaces se pueden abrir, algo que de otra manera no se podrían abrir. Esto puede permitir que un contenido web malicioso abra un archivo almacenado localmente mediante URL "file:". Esta vulnerabilidad afecta a las versiones anteriores a la 56 de Firefox.
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. Various other issues were also addressed.
