Use-after-free in macOS - CVE-2021-21779

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Main Vulnerability Database Vulnerabilities #VU53497

Use-after-free in macOS - CVE-2021-21779

Published: May 24, 2021 / Updated: June 3, 2021


Vulnerability identifier: #VU53497
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-21779
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing HTML content in WebKit. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger a use-after-free error and execute arbitrary code on the system.

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


Affected software

macOS
Arch Linux
Gentoo Linux
SUSE CaaS Platform
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Enterprise Storage
watchOS
SUSE OpenStack Cloud
SUSE Linux Enterprise Server
iPadOS
tvOS
Apple iOS
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Module for Desktop Applications
Ubuntu
Fedora
webkit2gtk (Debian package)
libjavascriptcoregtk-4.0-18 (Ubuntu package)
libwebkit2gtk-4.0-37 (Ubuntu package)
webkit2gtk3
libjavascriptcoregtk-4_0-18
libjavascriptcoregtk-4_0-18-debuginfo
libwebkit2gtk-4_0-37
libwebkit2gtk-4_0-37-debuginfo
typelib-1_0-JavaScriptCore-4_0
libwebkit2gtk3-lang
typelib-1_0-WebKit2-4_0
typelib-1_0-WebKit2WebExtension-4_0
webkit2gtk-4_0-injected-bundles
webkit2gtk-4_0-injected-bundles-debuginfo
webkit2gtk3-debugsource
webkit2gtk3-devel
webkitgtk4 (Red Hat package)
libsoup-lang
typelib-1_0-Soup-2_4
libsoup-devel
libsoup-debugsource
libsoup-2_4-1-debuginfo
libsoup-2_4-1
WebKitGTK+
Apple Safari

How to mitigate CVE-2021-21779

Install updates from vendor's website.

macOS - update to 11.4 20F71
webkit2gtk (Debian package) - update to 2.32.3-1~deb10u1
WebKitGTK+ - update to 2.33.1
watchOS - update to 7.5 18T567
Apple Safari - update to 14.1.1
iPadOS - update to 14.6 18F72
tvOS - update to 14.6 18L569
Apple iOS - update to 14.6 18F72
libjavascriptcoregtk-4.0-18 (Ubuntu package) - addressed in versions 2.32.3-0ubuntu0.18.04.1, 2.32.3-0ubuntu0.20.04.1, 2.32.3-0ubuntu0.21.04.1
libwebkit2gtk-4.0-37 (Ubuntu package) - addressed in versions 2.32.3-0ubuntu0.18.04.1, 2.32.3-0ubuntu0.20.04.1, 2.32.3-0ubuntu0.21.04.1
webkit2gtk3 - addressed in versions 2.32.3-1.fc33, 2.32.3-1.fc34
libjavascriptcoregtk-4_0-18 - update to 2.32.3-3.77.3
libjavascriptcoregtk-4_0-18-debuginfo - update to 2.32.3-3.77.3
libwebkit2gtk-4_0-37 - update to 2.32.3-3.77.3
libwebkit2gtk-4_0-37-debuginfo - update to 2.32.3-3.77.3
typelib-1_0-JavaScriptCore-4_0 - update to 2.32.3-3.77.3
libwebkit2gtk3-lang - update to 2.32.3-3.77.3
typelib-1_0-WebKit2-4_0 - update to 2.32.3-3.77.3
typelib-1_0-WebKit2WebExtension-4_0 - update to 2.32.3-3.77.3
webkit2gtk-4_0-injected-bundles - update to 2.32.3-3.77.3
webkit2gtk-4_0-injected-bundles-debuginfo - update to 2.32.3-3.77.3
webkit2gtk3-debugsource - update to 2.32.3-3.77.3
webkit2gtk3-devel - update to 2.32.3-3.77.3
webkitgtk4 (Red Hat package) - update to 2.48.3-2.el7_9
libsoup-lang - update to 2.62.2-17.8.1
typelib-1_0-Soup-2_4 - update to 2.62.2-17.8.1
libsoup-devel - update to 2.62.2-17.8.1
libsoup-debugsource - update to 2.62.2-17.8.1
libsoup-2_4-1-debuginfo - update to 2.62.2-17.8.1
libsoup-2_4-1 - update to 2.62.2-17.8.1

External References

Related Security Bulletins