Information disclosure in Mozilla Firefox and Firefox ESR - CVE-2021-43536

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Main Vulnerability Database Vulnerabilities #VU58585

Information disclosure in Mozilla Firefox and Firefox ESR - CVE-2021-43536

Published: December 7, 2021


Vulnerability identifier: #VU58585
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-43536
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to URL leakage when executing asynchronous functions. A remote attacker can trick the victim to open a specially crafted web page and reveal the URL of the page that is being visited afterwards.


Affected software

Mozilla Firefox
Firefox ESR
Gentoo Linux
Arch Linux
SUSE CaaS Platform
SUSE Enterprise Storage
CentOS
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
HPE Helion Openstack
Anolis OS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
SUSE Linux Enterprise Debuginfo
SUSE Linux Enterprise Server
Oracle Solaris
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Software Development Kit
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Desktop Applications
SUSE Linux Enterprise Workstation Extension
Ubuntu
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox-esr (Debian package)
thunderbird (Red Hat package)
firefox (Red Hat package)
firefox
thunderbird
MozillaThunderbird
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-debuginfo
MozillaThunderbird-debugsource
MozillaFirefox
MozillaFirefox-translations-common
MozillaFirefox-translations-other
MozillaFirefox-debuginfo
MozillaFirefox-devel
MozillaFirefox-debugsource
thunderbird (Debian package)
thunderbird (Ubuntu package)
mail-client/thunderbird
mail-client/thunderbird-bin
firefox (Ubuntu package)
Mozilla Thunderbird
IBM Cloud Pak for Multicloud Management Monitoring

How to mitigate CVE-2021-43536

Install updates from vendor's website.

Mozilla Firefox - update to 95.0
Firefox ESR - update to 91.4.0
firefox-esr (Debian package) - update to 91.4.1esr-1~deb11u1
Mozilla Thunderbird - update to 91.4.0
thunderbird (Red Hat package) - addressed in versions 91.4.0-2.el8_1, 91.4.0-2.el8_2, 91.4.0-2.el8_4, 91.4.0-2.el8_5, 91.4.0-3.el7_9
firefox (Red Hat package) - addressed in versions 91.4.0-1.el7_9, 91.4.0-1.el8_1, 91.4.0-1.el8_2, 91.4.0-1.el8_4, 91.4.0-1.el8_5
IBM Cloud Pak for Multicloud Management Monitoring - update to 2.3 Fix Pack 6
firefox - update to 91.4.0-1.0.1
thunderbird - update to 91.4.0-2.0.1
MozillaThunderbird - update to 91.4.0-8.45.2
MozillaThunderbird-translations-other - update to 91.4.0-8.45.2
MozillaThunderbird-translations-common - update to 91.4.0-8.45.2
MozillaThunderbird-debuginfo - update to 91.4.0-8.45.2
MozillaThunderbird-debugsource - update to 91.4.0-8.45.2
MozillaFirefox - addressed in versions 91.4.0-78.154.1, 91.4.0-112.83.1, 91.4.0-150.9.1, 91.4.0-152.9.1
MozillaFirefox-translations-common - addressed in versions 91.4.0-78.154.1, 91.4.0-112.83.1, 91.4.0-150.9.1, 91.4.0-152.9.1
MozillaFirefox-translations-other - addressed in versions 91.4.0-78.154.1, 91.4.0-150.9.1, 91.4.0-152.9.1
MozillaFirefox-debuginfo - addressed in versions 91.4.0-78.154.1, 91.4.0-112.83.1, 91.4.0-150.9.1, 91.4.0-152.9.1
MozillaFirefox-devel - addressed in versions 91.4.0-112.83.1, 91.4.0-150.9.1, 91.4.0-152.9.1
MozillaFirefox-debugsource - addressed in versions 91.4.0-112.83.1, 91.4.0-150.9.1, 91.4.0-152.9.1
thunderbird (Debian package) - addressed in versions 1:91.4.1-1~deb10u1, 1:91.4.1-1~deb11u1
thunderbird (Ubuntu package) - addressed in versions 1:91.5.0+build1-0ubuntu0.18.04.1, 1:91.5.0+build1-0ubuntu0.20.04.1, 1:91.5.0+build1-0ubuntu0.21.10.1
mail-client/thunderbird - update to 91.12.0
mail-client/thunderbird-bin - update to 91.12.0
firefox (Ubuntu package) - addressed in versions 95.0+build1-0ubuntu0.18.04.1, 95.0+build1-0ubuntu0.20.04.1, 95.0+build1-0ubuntu0.21.04.1, 95.0+build1-0ubuntu0.21.10.1, 95.0.1+build2-0ubuntu0.18.04.1, 95.0.1+build2-0ubuntu0.20.04.1, 95.0.1+build2-0ubuntu0.21.04.1, 95.0.1+build2-0ubuntu0.21.10.1

External References

Related Security Bulletins