Arch Linux Security Advisory ASA-202001-4
=========================================

Severity: Critical
Date    : 2020-01-14
CVE-ID  : CVE-2019-17016 CVE-2019-17017 CVE-2019-17022 CVE-2019-17024
          CVE-2019-17026
Package : thunderbird
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1086

Summary
=======

The package thunderbird before version 68.4.1-1 is vulnerable to
multiple issues including arbitrary code execution and insufficient
validation.

Resolution
==========

Upgrade to 68.4.1-1.

# pacman -Syu "thunderbird>=68.4.1-1"

The problems have been fixed upstream in version 68.4.1.

Workaround
==========

None.

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

- CVE-2019-17016 (insufficient validation)

A security issue has been found in Firefox before 72.0, and Thunderbird
before 68.4.1. When pasting a <style> tag from the clipboard into a
rich text editor, the CSS sanitizer incorrectly rewrites a @namespace
rule. This could allow for injection into certain types of websites
resulting in data exfiltration.

- CVE-2019-17017 (arbitrary code execution)

A type confusion issue has been found in Firefox before 72.0, and
Thunderbird before 68.4.1, in XPCVariant.cpp where, due to a missing
case handling object types, a type confusion vulnerability could occur,
resulting in a crash.

- CVE-2019-17022 (insufficient validation)

A security issue has been found in Firefox before 72.0, and Thunderbird
before 68.4.1 where CSS sanitization does not escape HTML tags. When
pasting a <style> tag from the clipboard into a rich text editor, the
CSS sanitizer does not escape < and > characters. Because the resulting
string is pasted directly into the text node of the element this does
not result in a direct injection into the webpage; however, if a
webpage subsequently copies the node's innerHTML, assigning it to
another innerHTML, this would result in an XSS vulnerability. Two
WYSIWYG editors were identified with this behavior, more may exist.

- CVE-2019-17024 (arbitrary code execution)

Several memory safety issues have been found in Firefox before 72.0,
Firefox ESR before 68.4.1, and Thunderbird before 68.3. 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-2019-17026 (arbitrary code execution)

A type confusion vulnerability has been found in Firefox before 72.0.1,
and Thunderbird before 68.4.1. Incorrect alias information in IonMonkey
JIT compiler for setting array elements could lead to a type confusion
with StoreElementHole and FallibleStoreElement. Mozilla is aware of
targeted attacks in the wild abusing this flaw.

Impact
======

A remote attacker could bypass security measures or execute arbitrary
code on the affected host.

References
==========

https://www.mozilla.org/en-US/security/advisories/mfsa2020-04/
https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/#CVE-2019-17016
https://bugzilla.mozilla.org/show_bug.cgi?id=1599181
https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/#CVE-2019-17017
https://bugzilla.mozilla.org/show_bug.cgi?id=1603055
https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/#CVE-2019-17022
https://bugzilla.mozilla.org/show_bug.cgi?id=1602843
https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/#CVE-2019-17024
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1507180%2C1595470%2C1598605%2C1601826
https://www.mozilla.org/en-US/security/advisories/mfsa2020-03/#CVE-2019-17026
https://bugzilla.mozilla.org/show_bug.cgi?id=1607443
https://security.archlinux.org/CVE-2019-17016
https://security.archlinux.org/CVE-2019-17017
https://security.archlinux.org/CVE-2019-17022
https://security.archlinux.org/CVE-2019-17024
https://security.archlinux.org/CVE-2019-17026