Cross-site scripting in Firefox ESR and Mozilla Firefox - CVE-2019-17022

Vulnerability identifier: #VU24060

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

CVE-ID: CVE-2019-17022

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the CSS sanitizer. When pasting a tag from the clipboard into a rich text editor, the CSS sanitizer does not escape < and > characters. If a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability.

Firefox ESR
Mozilla Firefox
Gentoo Linux
Arch Linux
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for x86_64
Slackware Linux
Opensuse
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
firefox (Ubuntu package)
thunderbird (Debian package)
thunderbird (Ubuntu package)
firefox-esr (Alpine package)
firefox-esr (Debian package)
firefox (Alpine package)
Mozilla Thunderbird

Install updates from vendor's website.

Firefox ESR - update to 68.4.0
Mozilla Firefox - update to 72.0
firefox (Ubuntu package) - addressed in versions 72.0.1+build1-0ubuntu0.16.04.1, 72.0.1+build1-0ubuntu0.18.04.1, 72.0.1+build1-0ubuntu0.19.04.1, 72.0.1+build1-0ubuntu0.19.10.1
thunderbird (Debian package) - addressed in versions 1:68.4.1-1~deb9u1, 1:68.4.1-1~deb10u1
thunderbird (Ubuntu package) - addressed in versions 1:68.4.1+build1-0ubuntu0.18.04.1, 1:68.4.1+build1-0ubuntu0.19.10.1, 1:68.7.0+build1-0ubuntu0.16.04.2
Mozilla Thunderbird - update to 68.4.1
firefox-esr (Alpine package) - update to 68.4.1-r0
firefox-esr (Debian package) - update to 68.4.1esr-1~deb10u1
firefox (Alpine package) - update to 72.0.1-r0

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-01/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Arch Linux update for firefox
• Slackware Linux update for mozilla-firefox
• Debian update for firefox-esr
• Ubuntu update for Firefox
• Slackware Linux update for mozilla-thunderbird
• Multiple vulnerabilities in Mozilla Thunderbird
• Red Hat update for firefox
• Red Hat update for firefox
• Arch Linux update for thunderbird
• Red Hat update for firefox
• OpenSUSE Linux update for MozillaFirefox
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Ubuntu update for Thunderbird
• Debian update for thunderbird
• OpenSUSE Linux update for MozillaThunderbird
• Red Hat update for firefox
• Red Hat update for thunderbird
• Gentoo update for Mozilla Firefox
• Ubuntu update for Thunderbird
• Cross-site scripting in firefox (Alpine package)
• Cross-site scripting in firefox-esr (Alpine package)