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Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers.

Mozilla Firefox 84 : The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must ensure that they are not attempting to use a dead actor they have a reference to. Such a check was omitted in WebGL, resulting in a use-after-free and a potentially exploitable crash.

Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass.

Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: When <code>flex-basis</code> was used on a table wrapper, a <code>StyleGenericFlexBasis</code> object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash.

Mozilla Firefox 84, Mozilla Firefox ESR 78.7, Mozilla Thunderbird 78.7: When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing.

Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine.

Mozilla Firefox 84 : When a user typed a URL in the address bar or the search bar and quickly hit the enter key, a website could sometimes capture that event and then redirect the user before navigation occurred to the desired, entered address. To construct a convincing spoof the attacker would have had to guess what the user was typing, perhaps by suggesting it.

Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: When an extension with the proxy permission registered to receive <code><all_urls></code>, the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs, a user opening View Source could have inadvertently leaked their IP address.

Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: If a user downloaded a file lacking an extension on Windows, and then "Open"-ed it from the downloads panel, if there was an executable file in the downloads directory with the same name but with an executable extension (such as .bat or .exe) that executable would have been launched instead.

Mozilla Firefox 84, Mozilla Firefox ESR 78.6, Mozilla Thunderbird 78.6: Mozilla developer Christian Holler reported memory safety bugs present in Firefox 83 and Firefox ESR 78.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.


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