Resource management error in Mozilla Firefox and Firefox ESR - CVE-2020-15654

Vulnerability identifier: #VU32906

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-2020-15654

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work.

Mozilla Firefox
Firefox ESR
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 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 x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Slackware Linux
Opensuse
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 (Alpine package)
firefox-esr (Alpine package)
firefox (Red Hat package)
firefox (Ubuntu package)
Mozilla Thunderbird

Install updates from vendor's website.

Mozilla Firefox - update to 79.0
Firefox ESR - update to 78.1.0
Mozilla Thunderbird - update to 78.0.1
firefox (Alpine package) - update to 79.0-r0
firefox-esr (Alpine package) - update to 78.1.0-r0
firefox (Red Hat package) - addressed in versions 78.2.0-2.el8_2, 78.2.0-3.el8_0, 78.2.0-3.el8_1, 78.3.0-1.el7_9
firefox (Ubuntu package) - addressed in versions 79.0+build1-0ubuntu0.16.04.2, 79.0+build1-0ubuntu0.18.04.1, 79.0+build1-0ubuntu0.20.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

• Multiple vulnerabilities in Mozilla Firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaFirefox
• Resource management error in firefox-esr (Alpine package)
• Resource management error in firefox (Alpine package)
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux 7 update for firefox
• Ubuntu update for firefox