Subject: [ASA-202001-1] firefox: multiple issues

Arch Linux Security Advisory ASA-202001-1
=========================================

Severity: Critical
Date    : 2020-01-08
CVE-ID  : CVE-2019-17016 CVE-2019-17017 CVE-2019-17020 CVE-2019-17022
          CVE-2019-17023 CVE-2019-17024 CVE-2019-17025
Package : firefox
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1084

Summary
=======

The package firefox before version 72.0-1 is vulnerable to multiple
issues including arbitrary code execution, insufficient validation,
access restriction bypass and denial of service.

Resolution
==========

Upgrade to 72.0-1.

# pacman -Syu "firefox>=72.0-1"

The problems have been fixed upstream in version 72.0.

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-2019-17020 (access restriction bypass)

A Content Security Policy bypass has been found in Firefox before 72.0,
where the CSP is not applied to XSL stylesheets applied to XML
documents. If the XSL sheet e.g. includes JavaScript, it would bypass
any of the restrictions of the Content Security Policy applied to the
XML document.

- 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-2019-17023 (denial of service)

A security issue has been found in the NSS component of Firefox before
72.0. After a HelloRetryRequest has been sent, the client may negotiate
a lower protocol that TLS 1.3, resulting in an invalid state transition
in the TLS State Machine. If the client gets into this state, incoming
Application Data records will be ignored.

- 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-2019-17025 (arbitrary code execution)

Several memory safety issues have been found in Firefox before 72.0.
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.

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/mfsa2020-01/
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-2019-17020
https://bugzilla.mozilla.org/show_bug.cgi?id=1597645
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-2019-17023
https://bugzilla.mozilla.org/show_bug.cgi?id=1590001
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/mfsa2020-01/#CVE-2019-17025
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1328295%2C1328300%2C1590447%2C1590965%2C1595692%2C1597321%2C1597481
https://security.archlinux.org/CVE-2019-17016
https://security.archlinux.org/CVE-2019-17017
https://security.archlinux.org/CVE-2019-17020
https://security.archlinux.org/CVE-2019-17022
https://security.archlinux.org/CVE-2019-17023
https://security.archlinux.org/CVE-2019-17024
https://security.archlinux.org/CVE-2019-17025