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Mozilla: WebAssembly, 74.0.1 Firefox Release, VR and DMs

Submitted by Roy Schestowitz on Saturday 4th of April 2020 01:54:39 AM Filed under
Moz/FF
  • Andy Wingo: multi-value webassembly in firefox: from 1 to n

    Greetings, hackers! Today I'd like to write about something I worked on recently: implementation of the multi-value future feature of WebAssembly in Firefox, as sponsored by Bloomberg.

    In the "minimum viable product" version of WebAssembly published in 2018, there were a few artificial restrictions placed on the language. Functions could only return a single value; if a function would naturally return two values, it would have to return at least one of them by writing to memory. Loops couldn't take parameters; any loop state variables had to be stored to and loaded from indexed local variables at each iteration. Similarly, any block that would naturally return more than one result would also have to do so via locals.

    This restruction is lifted with the multi-value proposal. Function types now map from result type to result type, where a result type is a sequence of value types. That is to say, just as functions can take multiple arguments, they can return multiple results. Similarly, with the multi-value proposal, block types are now the same as function types: loops and blocks can take arguments and return any number of results. This change improves the expressiveness of WebAssembly as a compilation target; a C++ program compiled to multi-value WebAssembly can be encoded in fewer bytes than before. Multi-value also establishes a base for other language extensions. For example, the exception handling proposal builds on multi-value to pass multiple values to catch blocks.

  • 74.0.1 Firefox Release

    Version 74.0.1, first offered to Release channel users on April 3, 2020

  • Firefox 74.0.1

    Firefox 74.0.1 has been released with two security fixes. CVE-2020-6819 is a use-after-free when running the nsDocShell destructor and CVE-2020-6820 is a use-after-free when handling a ReadableStream. In both cases there have been targeted attacks in the wild abusing these flaws. These issues have also been fixed in Firefox ESR 68.6.1.

  • Creating VR Worlds and Teaching Class with Mozilla Hubs

    With so many people stuck at home, self-isolating, because of the COVID-19 pandemic, people in every walk of life, including educators, are looking for novel ways to reach out to their audience. For teachers, that means students in classes that are now empty. How best to create and present content to students scattered in their various homes? Virtual reality (VR) presents an interesting way to scratch every itch, from the social, to the visual, to the need for 'being there'. It's also a great way to explore new and interesting ways to share information with students. #teachers #virtualreality #covid19

  • Twitter Direct Message Caching and Firefox

    Twitter is telling its users that their personal direct messages might be stored in Firefox’s web cache.

    This problem affects anyone who uses Twitter on Firefox from a shared computer account. Those users should clear their cache.

    This post explains how this problem occurred, what the implications are for those people who might be affected, and how problems of this nature might be avoided in future. To get there, we need to dig a little into how web caching works.

  • Twitter Data Cache on Mozilla Firefox

    We recently learned that the way Mozilla Firefox stores cached data may have resulted in non-public information being inadvertently stored in the browser's cache. This means that if you accessed Twitter from a shared or public computer via Mozilla Firefox and took actions like downloading your Twitter data archive or sending or receiving media via Direct Message, this information may have been stored in the browser’s cache even after you logged out of Twitter. The Mozilla Firefox browser’s cache retention period is set to 7 days and after that time the information should have automatically been removed from the cache. This issue did not impact people using other browsers like Safari or Chrome.

  • What you need to know about Twitter on Firefox

    Yesterday Twitter announced that for Firefox users data such as direct messages (DMs) might be left sitting on their computers even if they logged out. In this post I’ll try to help sort out what’s going on here.

    First, it’s important to understand the risk: what we’re talking about is “cached” data. All web browsers store local copies of data they get from servers so that they can avoid downloading the same data over the internet repeatedly. This makes a huge performance difference because websites are full of large files that change infrequently. Ordinarily this is what you want, but if you share a computer with other people, then they might be able to see that cached data, even if you have logged out of Twitter. It’s important to know that this data is just stored locally, so if you don’t share a computer this isn’t a problem for you. If you do share a computer, you can make sure all of your Twitter data is deleted by following the instructions here. If you do nothing, the data will be automatically deleted after 7 days the next time you run Firefox.

»

More on the bugfix

Submitted by Roy Schestowitz on Monday 6th of April 2020 01:51:41 PM.
  • Firefox Zero-Day Flaws Exploited in the Wild Get Patched

    Mozilla Foundation rushes patches to fix bugs in its browser that could allow for remote code execution.

    Mozilla patched two Firefox browser zero-day vulnerabilities actively being exploited in the wild. The flaws, both use-after-free bugs, have been part of “targeted attacks in the wild,” according to a Mozilla Foundation security advisory posted Friday.

    Both bugs have critical ratings and allow remote attackers to execute arbitrary code or trigger crashes on machines running versions of Firefox prior to 74.0.1 and its business-friendly Firefox Extended Support Release 68.6.1. The bugs impact Firefox browser versions running on Windows, macOS and Linux operating systems. Details are scant on how either bug (CVE-2020-6819 and CVE-2020-6820) are specifically being exploited by adversaries.

    Tracked as CVE-2020-6819, this bug is a use-after free vulnerability tied to the browser component “nsDocShell destructor”. The Firefox nsDocShell is a client of the nsI-HttpChannel API, a function of the browser related to reading HTTP headers.

  • Firefox gets fixes for two zero-days exploited in the wild

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