When listening for page changes with a Mutation Observer, a malicious web page could confuse Firefox Screenshots into interacting with elements other than those that it injected into the page. This would lead to internal errors and unexpected behavior in the Screenshots code. This vulnerability affects Firefox < 83.
Cuando se escuchan unos cambios de página con un Mutation Observer, una página web maliciosa podría confundir unas Screenshots de Firefox para interactuar con elementos distintos a los que inyectó en la página. Esto conllevaría a errores internos y un comportamiento inesperado en el código de Screenshots. Esta vulnerabilidad afecta a Firefox versiones anteriores a 83
USN-4637-1 fixed vulnerabilities in Firefox. This update provides the corresponding updates for Ubuntu 16.04 LTS. 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 cause a denial of service, obtain sensitive information across origins, bypass security restrictions, conduct phishing attacks, conduct cross-site scripting attacks, bypass Content Security Policy restrictions, conduct DNS rebinding attacks, or execute arbitrary code. Various other issues were also addressed.
