A thunderbird security update has been released for Arch Linux to address multiple issues.

ASA-202012-23: thunderbird: multiple issues

Arch Linux Security Advisory ASA-202012-23
=========================================
Severity: High
Date : 2020-12-16
CVE-ID : CVE-2020-16042 CVE-2020-26970 CVE-2020-26971 CVE-2020-26973
CVE-2020-26974 CVE-2020-26978 CVE-2020-35111 CVE-2020-35113
Package : thunderbird
Type : multiple issues
Remote : Yes
Link :   https://security.archlinux.org/AVG-1315

Summary
======
The package thunderbird before version 78.6.0-1 is vulnerable to
multiple issues including arbitrary code execution, content spoofing
and information disclosure.

Resolution
=========
Upgrade to 78.6.0-1.

# pacman -Syu "thunderbird>x.6.0-1"

The problems have been fixed upstream in version 78.6.0.

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

Description
==========
- CVE-2020-16042 (information disclosure)

An uninitialized use security issue has been found in the V8 component
of the chromium browser before version 87.0.4280.88 and Firefox before
84.0.

- CVE-2020-26970 (arbitrary code execution)

When reading SMTP server status codes, Thunderbird before 78.5.1 writes
an integer value to a position on the stack that is intended to contain
just one byte. Depending on processor architecture and stack layout,
this leads to stack corruption that may be exploitable.

- CVE-2020-26971 (arbitrary code execution)

A security issue was found in Firefox before 84.0 and Thunderbird
before 78.6 where certain blit values provided by the user were not
properly constrained, leading to a heap buffer overflow on some video
drivers.

- CVE-2020-26973 (content spoofing)

A security issue was found in Firefox before 84.0 and Thunderbird
before 78.6 where certain input to the CSS Sanitizer confused it,
resulting in incorrect components being removed. This could have been
used as a sanitizer bypass.

- CVE-2020-26974 (arbitrary code execution)

A security issue was found in Firefox before 84.0 and Thunderbird
before 78.6. When flex-basis was used on a table wrapper, a
StyleGenericFlexBasis 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.

- CVE-2020-26978 (information disclosure)

A security issue was discovered in Firefox before 84.0 and Thunderbird
before 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.

- CVE-2020-35111 (information disclosure)

A security issue was discovered in Firefox before 84.0 and Thunderbird
before 78.6. When an extension with the proxy permission registered to
receive , 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.

- CVE-2020-35113 (arbitrary code execution)

Mozilla developer Christian Holler reported memory safety bugs present
in Firefox 83, Firefox ESR 78.5 and Thunderbird 78.5. 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.

Impact
=====
A remote attacker might be able to access sensitive information, spoof
content or execute arbitrary code. Note that in general these flaws
cannot be exploited through email in the Thunderbird product because
scripting is disabled when reading mail, but are potentially risks in
browser or browser-like contexts.

References
=========
  https://bugs.archlinux.org/task/68853
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-53/
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/
  https://chromereleases.googleblog.com/2020/12/stable-channel-update-for-desktop.html
  https://crbug.com/1151890
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-16042
  https://bugzilla.mozilla.org/show_bug.cgi?id79003
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-53/#CVE-2020-26970
  https://bugzilla.mozilla.org/show_bug.cgi?id77338
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26971
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26971
  https://bugzilla.mozilla.org/show_bug.cgi?id63466
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26973
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26973
  https://bugzilla.mozilla.org/show_bug.cgi?id80084
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26974
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26974
  https://bugzilla.mozilla.org/show_bug.cgi?id81022
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26978
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26978
  https://bugzilla.mozilla.org/show_bug.cgi?id77047
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-35111
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-35111
  https://bugzilla.mozilla.org/show_bug.cgi?id57916
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-35113
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-35113
  https://bugzilla.mozilla.org/buglist.cgi?bug_id64831%2C1673589
  https://security.archlinux.org/CVE-2020-16042
  https://security.archlinux.org/CVE-2020-26970
  https://security.archlinux.org/CVE-2020-26971
  https://security.archlinux.org/CVE-2020-26973
  https://security.archlinux.org/CVE-2020-26974
  https://security.archlinux.org/CVE-2020-26978
  https://security.archlinux.org/CVE-2020-35111
  https://security.archlinux.org/CVE-2020-35113