Arch Linux Security Advisory ASA-202107-20
==========================================

Severity: High
Date    : 2021-07-14
CVE-ID  : CVE-2021-29970 CVE-2021-29972 CVE-2021-29974 CVE-2021-29975
          CVE-2021-29976 CVE-2021-29977 CVE-2021-30547
Package : firefox
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2148

Summary
=======

The package firefox before version 90.0-1 is vulnerable to multiple
issues including arbitrary code execution, content spoofing and
insufficient validation.

Resolution
==========

Upgrade to 90.0-1.

# pacman -Syu "firefox>=90.0-1"

The problems have been fixed upstream in version 90.0.

Workaround
==========

None.

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

- CVE-2021-29970 (arbitrary code execution)

A malicious webpage could have triggered a use-after-free, memory
corruption, and a potentially exploitable crash. This bug only affected
Firefox before version 90 and Thunderbird before version 78.12 when
accessibility was enabled.

- CVE-2021-29972 (arbitrary code execution)

A user-after-free vulnerability was found via testing, and traced to an
out-of-date Cairo library. Updating the library resolved the issue, and
may have remediated other, unknown security vulnerabilities as well.

- CVE-2021-29974 (insufficient validation)

When network partitioning was enabled, e.g. as a result of Enhanced
Tracking Protection settings, a TLS error page would allow the user to
override an error on a domain which had specified HTTP Strict Transport
Security (which implies that the error should not be override-able.)
This issue did not affect the network connections, and they were
correctly upgraded to HTTPS automatically.

- CVE-2021-29975 (content spoofing)

Through a series of DOM manipulations, a message, over which the
attacker had control of the text but not HTML or formatting, could be
overlaid on top of another domain (with the new domain correctly shown
in the address bar) resulting in possible user confusion.

- CVE-2021-29976 (arbitrary code execution)

Mozilla developers reported memory safety bugs present in Firefox 89
and Thunderbird 78.11. 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-2021-29977 (arbitrary code execution)

Mozilla developers reported memory safety bugs present in Firefox 89.
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-2021-30547 (arbitrary code execution)

An out of bounds write in ANGLE could have allowed an attacker to
corrupt memory leading to a potentially exploitable crash in the
Chromium browser engine before version 91.0.4472.101, Firefox before
version 90 and Thunderbird before version 78.12.

Impact
======

A remote attacker could execute arbitrary code or spoof content using a
crafted web page.

References
==========

https://www.mozilla.org/security/advisories/mfsa2021-28/
https://www.mozilla.org/security/advisories/mfsa2021-30/
https://bugzilla.mozilla.org/show_bug.cgi?id=1709976
https://bugzilla.mozilla.org/show_bug.cgi?id=1696816
https://bugzilla.mozilla.org/show_bug.cgi?id=1704843
https://bugzilla.mozilla.org/show_bug.cgi?id=1713259
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1700895%2C1703334%2C1706910%2C1711576%2C1714391
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1665836%2C1686138%2C1704316%2C1706314%2C1709931%2C1712084%2C1712357%2C1714066
https://chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop.html
https://crbug.com/1210414
https://bugzilla.mozilla.org/show_bug.cgi?id=1715766
https://security.archlinux.org/CVE-2021-29970
https://security.archlinux.org/CVE-2021-29972
https://security.archlinux.org/CVE-2021-29974
https://security.archlinux.org/CVE-2021-29975
https://security.archlinux.org/CVE-2021-29976
https://security.archlinux.org/CVE-2021-29977
https://security.archlinux.org/CVE-2021-30547