Mozilla Firefox: Remote code execution — GLSA 202011-07

A use-after-free in Mozilla Firefox might allow remote attacker(s) to execute arbitrary code.

Package	www-client/firefox on all architectures
Affected versions	< 82.0.3
Unaffected versions	>= 82.0.3 >= 78.4.1

Package	www-client/firefox-bin on all architectures
Affected versions	< 78.4.1
Unaffected versions	>= 82.0.3 >= 78.4.1

Mozilla Firefox is a popular open-source web browser from the Mozilla project.

Invalid assumptions when emitting the the MCallGetProperty opcode in the JavaScript JIT may result in a use-after-free condition.

A remote attacker could possibly execute arbitrary code with the privileges of the process, or cause a Denial of Service condition.

There is no known workaround at this time.

All Mozilla Firefox users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=www-client/firefox-82.0.3"

All Mozilla Firefox (bin) users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose
 ">=www-client/firefox-bin-78.4.1:0/esr78"

All Mozilla Firefox (ESR) users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=www-client/firefox-82.0.3"

All Mozilla Firefox (ESR) bin users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose
 ">=www-client/firefox-bin-78.4.1:0/esr78"

Release date
November 11, 2020

Latest revision
November 11, 2020: 1

Severity
normal

Exploitable
remote

Bugzilla entries