A content security policy (CSP) "frame-ancestors" directive containing origins with paths allows for comparisons against those paths instead of the origin. This results in a cross-origin information leak of this path information. This vulnerability affects Firefox < 55.
Una directiva CSP (Content Security Policy) "frame-ancestors" que contiene orígenes con rutas permite comparaciones con dichas rutas en vez de con el origen. Esto resultan en una fuga de información de orígenes cruzados de esta información de rutas. Esta vulnerabilidad afecta a las versiones anteriores a la 55 de Firefox.
USN-3391-1 fixed vulnerabilities in Firefox. The update introduced a performance regression with WebExtensions. 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 conduct cross-site scripting attacks, bypass sandbox restrictions, obtain sensitive information, spoof the origin of modal alerts, bypass same origin restrictions, read uninitialized memory, cause a denial of service via program crash or hang, or execute arbitrary code. Various other issues were also addressed.
