Insufficient UI Warning of Dangerous Operations in Mozilla Firefox - CVE-2021-29987

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Main Vulnerability Database Vulnerabilities #VU55686

Insufficient UI Warning of Dangerous Operations in Mozilla Firefox - CVE-2021-29987

Published: August 10, 2021


Vulnerability identifier: #VU55686
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-2021-29987
CWE-ID: CWE-357
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 the way Firefox displays permission panels. After requesting multiple permissions, and closing the first permission panel, subsequent permission panels will be displayed in a different position but still record a click in the default location, making it possible to trick a user into accepting a permission they did not want to.

Note, the vulnerability affects Linux installations only.


Affected software

Mozilla Firefox
Gentoo Linux
Arch Linux
SUSE CaaS Platform
SUSE Enterprise Storage
SUSE OpenStack Cloud
HPE Helion Openstack
SUSE OpenStack Cloud Crowbar
SUSE Linux Enterprise Debuginfo
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Software Development Kit
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Desktop Applications
Ubuntu
firefox (Ubuntu package)
MozillaFirefox
MozillaFirefox-debuginfo
MozillaFirefox-debugsource
MozillaFirefox-devel
MozillaFirefox-translations-common
MozillaFirefox-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-translations-other
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaThunderbird-debugsource
MozillaFirefox-branding-SLE
thunderbird (Ubuntu package)
MozillaFirefox-branding-SLED

How to mitigate CVE-2021-29987

Install updates from vendor's website.

Mozilla Firefox - update to 91.0
firefox (Ubuntu package) - addressed in versions 91.0+build2-0ubuntu0.18.04.1, 91.0+build2-0ubuntu0.20.04.1, 91.0+build2-0ubuntu0.21.04.1
MozillaFirefox - addressed in versions 91.1.0-112.71.1, 91.2.0-3.155.2, 91.2.0-8.54.1, 91.2.0-78.143.1, 91.9.0-112.104.1, 91.9.0-150000.150.34.1
MozillaFirefox-debuginfo - addressed in versions 91.1.0-112.71.1, 91.2.0-3.155.2, 91.2.0-8.54.1, 91.2.0-78.143.1, 91.9.0-112.104.1, 91.9.0-150000.150.34.1
MozillaFirefox-debugsource - addressed in versions 91.1.0-112.71.1, 91.2.0-3.155.2, 91.2.0-8.54.1, 91.9.0-112.104.1, 91.9.0-150000.150.34.1
MozillaFirefox-devel - addressed in versions 91.1.0-112.71.1, 91.2.0-3.155.2, 91.2.0-8.54.1, 91.9.0-112.104.1, 91.9.0-150000.150.34.1
MozillaFirefox-translations-common - addressed in versions 91.1.0-112.71.1, 91.2.0-3.155.2, 91.2.0-8.54.1, 91.2.0-78.143.1, 91.9.0-112.104.1, 91.9.0-150000.150.34.1
MozillaFirefox-translations-other - addressed in versions 91.2.0-3.155.2, 91.2.0-8.54.1, 91.2.0-78.143.1, 91.9.0-150000.150.34.1
MozillaThunderbird-translations-common - update to 91.4.0-8.45.2
MozillaThunderbird-translations-other - update to 91.4.0-8.45.2
MozillaThunderbird - 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-branding-SLE - addressed in versions 91-4.19.1, 91-9.5.1, 91-35.6.6
thunderbird (Ubuntu package) - addressed in versions 1:91.5.0+build1-0ubuntu0.18.04.1, 1:91.5.0+build1-0ubuntu0.20.04.1
MozillaFirefox-branding-SLED - update to 91-21.18.1

External References

Related Security Bulletins