Arch Linux Security Advisory ASA-202005-3
=========================================

Severity: Critical
Date    : 2020-05-06
CVE-ID  : CVE-2020-6831  CVE-2020-12387 CVE-2020-12390 CVE-2020-12391
          CVE-2020-12392 CVE-2020-12394 CVE-2020-12395 CVE-2020-12396
Package : firefox
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1148

Summary
=======

The package firefox before version 76.0-1 is vulnerable to multiple
issues including arbitrary code execution, content spoofing and
insufficient validation.

Resolution
==========

Upgrade to 76.0-1.

# pacman -Syu "firefox>=76.0-1"

The problems have been fixed upstream in version 76.0.

Workaround
==========

None.

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

- CVE-2020-6831 (arbitrary code execution)

A buffer overflow could occur when parsing and validating SCTP chunks
in WebRTC, in Firefox before 76.0 and chromium before 81.0.4044.138.
This could have led to memory corruption and a potentially exploitable
crash.

- CVE-2020-12387 (arbitrary code execution)

A race condition has been found in Firefox before 76.0, when running
shutdown code for Web Worker, leading to a use-after-free
vulnerability. This results in a potentially exploitable crash.

- CVE-2020-12390 (insufficient validation)

An incorrect origin serialization of URLs with IPv6 addresses issue has
been found in Firefox before 76.0, and could lead to incorrect security
checks.

- CVE-2020-12391 (arbitrary code execution)

Documents formed using data: URLs in an object element failed to
inherit the CSP of the creating context in Firefox before 76.0. This
allowed the execution of scripts that should have been blocked, albeit
with a unique opaque origin.

- CVE-2020-12392 (content spoofing)

The 'Copy as cURL' feature of Devtools' network tab did not properly
escape the HTTP POST data of a request in Firefox before 76.0, which
can be controlled by the website. If a user used the 'Copy as cURL'
feature and pasted the command into a terminal, it could have resulted
in the disclosure of local files.

- CVE-2020-12394 (content spoofing)

A logic flaw has been found in the location bar implementation of
Firefox before 76.0, and could have allowed a local attacker to spoof
the current location by selecting a different origin and removing focus
from the input element.

- CVE-2020-12395 (arbitrary code execution)

Several memory safety bugs has been found in Firefox before 76.0 and
Firefox ESR before 68.8. 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-2020-12396 (arbitrary code execution)

Several memory safety bugs have been found in Firefox before 76.0. 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 might be able to spoof content, bypass security
checks and execute arbitrary code on the affected host.

References
==========

https://bugzilla.mozilla.org/show_bug.cgi?id=1632241
https://crbug.com/1073602
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-6831
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12387
https://bugzilla.mozilla.org/show_bug.cgi?id=1545345
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12390
https://bugzilla.mozilla.org/show_bug.cgi?id=1141959
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12391
https://bugzilla.mozilla.org/show_bug.cgi?id=1457100
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12392
https://bugzilla.mozilla.org/show_bug.cgi?id=1614468
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12394
https://bugzilla.mozilla.org/show_bug.cgi?id=1628288
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12395
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1595886%2C1611482%2C1614704%2C1624098%2C1625749%2C1626382%2C1628076%2C1631508
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12396
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1339601%2C1611938%2C1620488%2C1622291%2C1627644
https://security.archlinux.org/CVE-2020-6831
https://security.archlinux.org/CVE-2020-12387
https://security.archlinux.org/CVE-2020-12390
https://security.archlinux.org/CVE-2020-12391
https://security.archlinux.org/CVE-2020-12392
https://security.archlinux.org/CVE-2020-12394
https://security.archlinux.org/CVE-2020-12395
https://security.archlinux.org/CVE-2020-12396