Resource management error in Mozilla Firefox - CVE-2020-26976

Vulnerability identifier: #VU49018

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-2020-26976

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper management of internal resources within the application, when processing embedded elements with https/http protocols. When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing.

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

Install updates from vendor's website.

Mozilla Firefox - update to 84.0
Firefox ESR - update to 78.7.0
Mozilla Thunderbird - update to 78.7.0
firefox-esr (Alpine package) - update to 78.7.0-r0
thunderbird (Debian package) - update to 78.7.0-1~deb10u1
firefox-esr (Debian package) - update to 78.7.0esr-1~deb10u1
firefox (Red Hat package) - addressed in versions 78.7.0-2.el7_9, 78.7.0-2.el8_1, 78.7.0-2.el8_2, 78.7.0-2.el8_3
thunderbird (Red Hat package) - addressed in versions 78.7.0-1.el7_9, 78.7.0-1.el8_1, 78.7.0-1.el8_2, 78.7.0-1.el8_3
thunderbird (Alpine package) - update to 78.7.0-r0
firefox (Alpine package) - update to 84.0.1-r0
thunderbird (Ubuntu package) - update to 1:78.7.1+build1-0ubuntu0.20.10.4
firefox (Ubuntu package) - addressed in versions 84.0+build3-0ubuntu0.16.04.1, 84.0+build3-0ubuntu0.18.04.1, 84.0+build3-0ubuntu0.20.04.1, 84.0+build3-0ubuntu0.20.10.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Arch Linux update for firefox
• Resource management error in firefox (Alpine package)
• MitM-attack in Mozilla Firefox ESR
• Multiple vulnerabilities in Mozilla Thunderbird
• Red Hat Enterprise Linux 8.1 update for firefox
• Resource management error in firefox-esr (Alpine package)
• Debian update for firefox-esr
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux 8.2 update for thunderbird
• Red Hat Enterprise Linux 7 update for firefox
• Red Hat Enterprise Linux 8.2 update for firefox
• Red Hat Enterprise Linux 7 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Gentoo update for Mozilla Thunderbird
• Debian update for thunderbird
• Arch Linux update for thunderbird
• Red Hat Enterprise Linux 8.1 update for thunderbird
• Resource management error in thunderbird (Alpine package)
• Ubuntu update for thunderbird
• Ubuntu update for firefox