A thunderbird security update has been released for Arch Linux.

Arch Linux Security Advisory ASA-202102-2
=========================================

Severity: High
Date : 2021-02-06
CVE-ID : CVE-2020-15685 CVE-2020-26976 CVE-2021-23953 CVE-2021-23954
CVE-2021-23960 CVE-2021-23964
Package : thunderbird
Type : multiple issues
Remote : Yes
Link :   https://security.archlinux.org/AVG-1496

Summary
=======

The package thunderbird before version 78.7.0-1 is vulnerable to
multiple issues including arbitrary code execution, information
disclosure and insufficient validation.

Resolution
==========

Upgrade to 78.7.0-1.

# pacman -Syu "thunderbird>=78.7.0-1"

The problems have been fixed upstream in version 78.7.0.

Workaround
==========

None.

Description
===========

- CVE-2020-15685 (insufficient validation)

A security issue was found in Thunderbird before version 78.7. During
the plaintext phase of the STARTTLS connection setup, protocol commands
could have been injected and evaluated within the encrypted session.

- CVE-2020-26976 (information disclosure)

A security issue was found in Firefox before 84.0. When an HTTPS page
was embedded in an 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.

- CVE-2021-23953 (information disclosure)

A security issue was found in Firefox before version 85.0 and
Thunderbird before version 78.7. If a user clicked into a specifically
crafted PDF, the PDF reader could be confused into leaking cross-origin
information, when said information is served as chunked data.

- CVE-2021-23954 (arbitrary code execution)

A security issue was found in Firefox before version 85.0 and
Thunderbird before version 78.7. Using the new logical assignment
operators in a JavaScript switch statement could have caused a type
confusion, leading to a memory corruption and a potentially exploitable
crash.

- CVE-2021-23960 (arbitrary code execution)

A security issue was found in Firefox before version 85.0 and
Thunderbird before version 78.7. Performing garbage collection on re-
declared JavaScript variables resulted in a use-after-poison, and a
potentially exploitable crash.

- CVE-2021-23964 (arbitrary code execution)

A security issue was found in Firefox before version 85.0 and
Thunderbird before version 78.7. Mozilla developers reported memory
safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 or
execute arbitrary code. In addition, an attacker in position of man-in-
the-middle might be able to inject an IMAP response into a secure
communication channel with the server.

References
==========

  https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2020-15685
  https://bugzilla.mozilla.org/show_bug.cgi?id=1622640
  https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26976
  https://bugzilla.mozilla.org/show_bug.cgi?id=1674343
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23953
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2021-23953
  https://bugzilla.mozilla.org/show_bug.cgi?id=1683940
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23954
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2021-23954
  https://bugzilla.mozilla.org/show_bug.cgi?id=1684020
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23960
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2021-23960
  https://bugzilla.mozilla.org/show_bug.cgi?id=1675755
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23964
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2021-23964
  https://bugzilla.mozilla.org/buglist.cgi?bug_id=1662507%2C1666285%2C1673526%2C1674278%2C1674835%2C1675097%2C1675844%2C1675868%2C1677590%2C1677888%2C1680410%2C1681268%2C1682068%2C1682938%2C1683736%2C1685260%2C1685925
  https://security.archlinux.org/CVE-2020-15685
  https://security.archlinux.org/CVE-2020-26976
  https://security.archlinux.org/CVE-2021-23953
  https://security.archlinux.org/CVE-2021-23954
  https://security.archlinux.org/CVE-2021-23960
  https://security.archlinux.org/CVE-2021-23964