Out-of-bounds read in Firefox ESR and Mozilla Firefox - CVE-2020-6806

Vulnerability identifier: #VU25850

CSH Severity: High

CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-6806

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to an out-of-bounds read error due to BodyStream::OnInputStreamReady was missing protections against state confusion. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Firefox ESR
Mozilla Firefox
Arch Linux
Gentoo Linux
CentOS
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for Power, big endian - 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
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Oracle Solaris
Slackware Linux
Opensuse
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
firefox (Ubuntu package)
thunderbird (Debian package)
firefox-esr (Debian package)
thunderbird (Ubuntu package)
thunderbird (Red Hat package)
firefox-esr (Alpine package)
mozjs68 (Alpine package)
thunderbird (Alpine package)
firefox (Alpine package)
Mozilla Thunderbird
Cloud App Management V2018

Install updates from vendor's website.

Firefox ESR - update to 68.6.0
Mozilla Firefox - update to 74.0
firefox (Ubuntu package) - addressed in versions 74.0+build3-0ubuntu0.16.04.1, 74.0+build3-0ubuntu0.18.04.1, 74.0+build3-0ubuntu0.19.10.1
thunderbird (Debian package) - addressed in versions 1:68.6.0-1~deb9u1, 1:68.6.0-1~deb10u1
Mozilla Thunderbird - update to 68.6.0
firefox-esr (Debian package) - addressed in versions 68.6.0esr-1~deb9u1, 68.6.0esr-1~deb10u1
thunderbird (Ubuntu package) - update to 1:68.7.0+build1-0ubuntu0.16.04.2
thunderbird (Red Hat package) - addressed in versions 68.6.0-1.el6_10, 68.6.0-1.el7_7, 68.6.0-1.el8_0, 68.6.0-1.el8_1
firefox-esr (Alpine package) - update to 68.6.0-r0
mozjs68 (Alpine package) - update to 68.6.0-r0
thunderbird (Alpine package) - update to 68.7.0-r0
firefox (Alpine package) - update to 74.0-r0
Cloud App Management V2018 - update to 2020.1.0

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-08/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-09/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1612308

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Slackware Linux update for mozilla-firefox
• Arch Linux update for firefox
• Ubuntu update for Firefox
• Debian update for firefox-esr
• Gentoo update for Mozilla Firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Slackware Linux update for mozilla-thunderbird
• Gentoo update for Mozilla Thunderbird
• OpenSUSE Linux update for MozillaFirefox
• Arch Linux update for thunderbird
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux Server 8 update for firefox
• Red Hat Enterprise Linux 6 update for firefox
• Red Hat Enterprise Linux 7 update for firefox
• Debian update for thunderbird
• OpenSUSE Linux update for MozillaThunderbird
• Red Hat Enterprise Linux 6 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• CentOS 6 update for firefox
• CentOS 6 update for thunderbird
• CentOS 7 update for firefox
• CentOS 7 update for thunderbird
• Ubuntu update for Thunderbird
• Oracle Solaris update for third party packages
• Out-of-bounds read in thunderbird (Alpine package)
• Out-of-bounds read in firefox (Alpine package)
• Out-of-bounds read in firefox-esr (Alpine package)
• Out-of-bounds read in mozjs68 (Alpine package)
• Multiple vulnerabilities in IBM Cloud App Management
• Red Hat Enterprise Linux 7 update for thunderbird