Arch Linux Security Advisory ASA-202104-4
=========================================

Severity: High
Date    : 2021-04-29
CVE-ID  : CVE-2021-23961 CVE-2021-23994 CVE-2021-23995 CVE-2021-23998
          CVE-2021-23999 CVE-2021-24002 CVE-2021-29946 CVE-2021-29948
Package : thunderbird
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1836

Summary
=======

The package thunderbird before version 78.10.0-1 is vulnerable to
multiple issues including arbitrary code execution, arbitrary command
execution, content spoofing, information disclosure, sandbox escape,
access restriction bypass and signature forgery.

Resolution
==========

Upgrade to 78.10.0-1.

# pacman -Syu "thunderbird>=78.10.0-1"

The problems have been fixed upstream in version 78.10.0.

Workaround
==========

None.

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

- CVE-2021-23961 (information disclosure)

A security issue was found in Firefox before version 85.0. Further
techniques that built on the slipstream research combined with a
malicious webpage could have exposed both an internal network's hosts
as well as services running on the user's local machine.

- CVE-2021-23994 (arbitrary code execution)

A security issue has been found in Firefox before version 88 and
Thunderbird before version 78.10. A WebGL framebuffer was not
initialized early enough, resulting in memory corruption and an out of
bounds write.

- CVE-2021-23995 (arbitrary code execution)

A security issue has been found in Firefox before version 88 and
Thunderbird before version 78.10. When Responsive Design Mode was
enabled, it used references to objects that were previously freed.
Mozilla presumes that with enough effort this could have been exploited
to run arbitrary code.

- CVE-2021-23998 (content spoofing)

A security issue has been found in Firefox before version 88 and
Thunderbird before version 78.10. Through complicated navigations with
new windows, an HTTP page could have inherited a secure lock icon from
an HTTPS page.

- CVE-2021-23999 (sandbox escape)

A security issue has been found in Firefox before version 88 and
Thunderbird before version 78.10. If a Blob URL was loaded through some
unusual user interaction, it could have been loaded by the System
Principal and granted additional privileges that should not be granted
to web content.

- CVE-2021-24002 (arbitrary command execution)

A security issue has been found in Firefox before version 88 and
Thunderbird before version 78.10. When a user clicked on an FTP URL
containing encoded newline characters (%0A and %0D), the newlines would
have been interpreted as such and allowed arbitrary commands to be sent
to the FTP server.

- CVE-2021-29946 (access restriction bypass)

A security issue has been found in Firefox before version 88 and
Thunderbird before version 78.10. Ports that were written as an integer
overflow above the bounds of a 16-bit integer could have bypassed port
blocking restrictions when used in the Alt-Svc header.

- CVE-2021-29948 (signature forgery)

A security issue has been found in Thunderbird before version 78.10.
Signatures are written to disk before and read during verification,
which might be subject to a race condition when a malicious local
process or user is replacing the file.

Impact
======

An attacker is able to execute arbitrary code, spoof context, escape
the sandbox, and bypass port blocking restrictions through various
means. In addition a local attacker might spoof the verification of
emails signed using PGP by winning a race condition.

References
==========

https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23961
https://bugzilla.mozilla.org/show_bug.cgi?id=1677940
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23994
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-23994
https://bugzilla.mozilla.org/show_bug.cgi?id=1699077
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23995
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-23995
https://bugzilla.mozilla.org/show_bug.cgi?id=1699835
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23998
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-23998
https://bugzilla.mozilla.org/show_bug.cgi?id=1667456
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23999
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-23999
https://bugzilla.mozilla.org/show_bug.cgi?id=1691153
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-24002
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-24002
https://bugzilla.mozilla.org/show_bug.cgi?id=1702374
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-29946
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-29946
https://bugzilla.mozilla.org/show_bug.cgi?id=1698503
https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-29948
https://bugzilla.mozilla.org/show_bug.cgi?id=1692899
https://security.archlinux.org/CVE-2021-23961
https://security.archlinux.org/CVE-2021-23994
https://security.archlinux.org/CVE-2021-23995
https://security.archlinux.org/CVE-2021-23998
https://security.archlinux.org/CVE-2021-23999
https://security.archlinux.org/CVE-2021-24002
https://security.archlinux.org/CVE-2021-29946
https://security.archlinux.org/CVE-2021-29948