CVE-2022-29909

Los documentos en contextos de navegación entre orígenes profundamente anidados podrían haber obtenido permisos otorgados al origen de nivel superior, omitiendo el mensaje existente y heredando erróneamente los permisos de nivel superior. Esta vulnerabilidad afecta a Thunderbird < 91.9, Firefox ESR < 91.9 y Firefox < 100.

The Mozilla Foundation Security Advisory describes this flaw as: Documents in deeply-nested cross-origin browsing contexts could have obtained permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions.

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, bypass permission prompts, obtain sensitive information, bypass security restrictions, cause user confusion, or execute arbitrary code. It was discovered that Thunderbird would show the wrong security status after viewing an attached message that is signed or encrypted. An attacker could potentially exploit this by tricking the user into trusting the authenticity of a message.