Input validation error in Firefox ESR and Mozilla Firefox - CVE-2021-29946

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Main Vulnerability Database Vulnerabilities #VU52346

Input validation error in Firefox ESR and Mozilla Firefox - CVE-2021-29946

Published: April 19, 2021


Vulnerability identifier: #VU52346
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-29946
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input. Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header.


Affected software

Firefox ESR
Mozilla Firefox
Gentoo Linux
Arch Linux
SUSE Manager Retail Branch Server
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Server
SUSE Enterprise Storage
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, big endian
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
HPE Helion Openstack
Anolis OS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
SUSE Linux Enterprise Debuginfo
SUSE Linux Enterprise Server
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
openEuler
IBM Cloud Pak for Multicloud Management
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)
firefox (Red Hat package)
thunderbird (Red Hat package)
mozjs78
mozjs78-devel
mozjs78-debuginfo
mozjs78-debugsource
mozjs78-help
thunderbird
firefox
MozillaFirefox
MozillaFirefox-translations-other
MozillaFirefox-translations-common
MozillaFirefox-devel
MozillaFirefox-debugsource
MozillaFirefox-debuginfo
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird-debuginfo
MozillaThunderbird
MozillaThunderbird-translations-other
firefox-debugsource
firefox-debuginfo
mozilla-crashreporter-firefox-debuginfo
firefox (Ubuntu package)
IBM Cloud Application Performance Management (APM)
Mozilla Thunderbird

How to mitigate CVE-2021-29946

Install updates from vendor's website.

Firefox ESR - update to 78.10.0
Mozilla Firefox - update to 88.0
IBM Cloud Pak for Multicloud Management - update to 2.3.21
Mozilla Thunderbird - update to 78.10.0
firefox-esr (Debian package) - update to 78.10.0esr-1~deb10u1
firefox (Red Hat package) - addressed in versions 78.10.0-1.el7_9, 78.10.0-1.el8_1, 78.10.0-1.el8_2, 78.10.0-1.el8_3
thunderbird (Red Hat package) - addressed in versions 78.10.0-1.el7_9, 78.10.0-1.el8_1, 78.10.0-1.el8_2, 78.10.0-1.el8_3
mozjs78 - update to 78.4.0-4
mozjs78-devel - update to 78.4.0-4
mozjs78-debuginfo - update to 78.4.0-4
mozjs78-debugsource - update to 78.4.0-4
mozjs78-help - update to 78.4.0-4
thunderbird - update to 78.10.0-1.0.1
firefox - update to 78.10.0-1.0.1
MozillaFirefox - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1, 78.10.0-112.57.2
MozillaFirefox-translations-other - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1
MozillaFirefox-translations-common - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1, 78.10.0-112.57.2
MozillaFirefox-devel - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-112.57.2
MozillaFirefox-debugsource - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-112.57.2
MozillaFirefox-debuginfo - addressed in versions 78.10.0-3.139.1, 78.10.0-8.38.1, 78.10.0-78.126.1, 78.10.0-112.57.2
MozillaThunderbird-translations-common - update to 78.10.0-8.23.1
MozillaThunderbird-debugsource - update to 78.10.0-8.23.1
MozillaThunderbird-debuginfo - update to 78.10.0-8.23.1
MozillaThunderbird - update to 78.10.0-8.23.1
MozillaThunderbird-translations-other - update to 78.10.0-8.23.1
firefox-debugsource - addressed in versions 79.0-20, 79.0-21
firefox-debuginfo - addressed in versions 79.0-20, 79.0-21
mozilla-crashreporter-firefox-debuginfo - addressed in versions 79.0-20, 79.0-21
firefox - addressed in versions 79.0-20, 79.0-21
firefox (Ubuntu package) - addressed in versions 88.0+build2-0ubuntu0.16.04.1, 88.0+build2-0ubuntu0.18.04.2, 88.0+build2-0ubuntu0.20.04.1, 88.0+build2-0ubuntu0.20.10.1, 88.0+build2-0ubuntu0.21.04.1

External References

Related Security Bulletins