A firefox security update has been released for Arch Linux.

ASA-202009-10: firefox: multiple issues

Arch Linux Security Advisory ASA-202009-10
=========================================
Severity: High
Date : 2020-09-23
CVE-ID : CVE-2020-15673 CVE-2020-15674 CVE-2020-15675 CVE-2020-15676
CVE-2020-15677 CVE-2020-15678
Package : firefox
Type : multiple issues
Remote : Yes
Link :   https://security.archlinux.org/AVG-1235

Summary
======
The package firefox before version 81.0-1 is vulnerable to multiple
issues including arbitrary code execution, content spoofing, cross-site
scripting and denial of service.

Resolution
=========
Upgrade to 81.0-1.

# pacman -Syu "firefox>?.0-1"

The problems have been fixed upstream in version 81.0.

Workaround
=========
None.

Description
==========
- CVE-2020-15673 (arbitrary code execution)

Several memory safety issues have been found in Firefox before 81.0 and
Firefox ESR 78.3. Some of these bugs showed evidence of memory
corruption and Mozilla presumes that with enough effort some of these
could have been exploited to run arbitrary code.

- CVE-2020-15674 (arbitrary code execution)

Several memory safety issues have been found in Firefox before 81.0.
Some of these bugs showed evidence of memory corruption and Mozilla
presumes that with enough effort some of these could have been
exploited to run arbitrary code.

- CVE-2020-15675 (arbitrary code execution)

A use-after-free issue has been found in the WebGL implementation of
Firefox before 81.0 where, when processing surfaces, the lifetime may
outlive a persistent buffer leading to memory corruption and a
potentially exploitable crash.

- CVE-2020-15676 (cross-site scripting)

Firefox before 81.0 sometimes ran the onload handler for SVG elements
that the DOM sanitizer decided to remove, resulting in JavaScript being
executed after pasting attacker-controlled data into a content-editable
element.

- CVE-2020-15677 (content spoofing)

An issue has been found in Firefox before 81.0 where, by exploiting an
Open Redirect vulnerability on a website, an attacker could have
spoofed the site displayed in the download file dialog to show the
original site (the one suffering from the open redirect) rather than
the site the file was actually downloaded from.

- CVE-2020-15678 (denial of service)

A use-after-free issue has been found in Firefox before 81.0 where,
when recursing through graphical layers while scrolling, an iterator
may have become invalid, resulting in a potential use-after-free. This
occurs because the function
APZCTreeManager::ComputeClippedCompositionBounds did not follow
iterator invalidation rules.

Impact
=====
A remote attacker might be able to cause a crash, spoof content or
execute arbitrary code.

References
=========
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15673
  https://bugzilla.mozilla.org/buglist.cgi?bug_id48493%2C1660800
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15674
  https://bugzilla.mozilla.org/buglist.cgi?bug_id56063%2C1656064%2C1656067%2C1660293
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15675
  https://bugzilla.mozilla.org/show_bug.cgi?id54211
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15676
  https://bugzilla.mozilla.org/show_bug.cgi?id46140
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15677
  https://bugzilla.mozilla.org/show_bug.cgi?id41487
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15678
  https://bugzilla.mozilla.org/show_bug.cgi?id60211
  https://security.archlinux.org/CVE-2020-15673
  https://security.archlinux.org/CVE-2020-15674
  https://security.archlinux.org/CVE-2020-15675
  https://security.archlinux.org/CVE-2020-15676
  https://security.archlinux.org/CVE-2020-15677
  https://security.archlinux.org/CVE-2020-15678