Use-after-free in WebKitGTK+ and WPE WebKit - CVE-2021-21806

Vulnerability identifier: #VU53781

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-2021-21806

CWE-ID: CWE-416

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 a use-after-free error when processing HTML content. 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.

WebKitGTK+
WPE WebKit
Gentoo Linux
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
HPE Helion Openstack
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Software Development Kit
SUSE Linux Enterprise Module for Desktop Applications
SUSE Linux Enterprise Module for Basesystem
libjavascriptcoregtk-4_0-18
libwebkit2gtk3-lang
webkit2gtk3-devel
webkit2gtk3-debugsource
webkit2gtk-4_0-injected-bundles-debuginfo
webkit2gtk-4_0-injected-bundles
typelib-1_0-WebKit2WebExtension-4_0
typelib-1_0-WebKit2-4_0
typelib-1_0-JavaScriptCore-4_0
libwebkit2gtk-4_0-37-debuginfo
libwebkit2gtk-4_0-37
libjavascriptcoregtk-4_0-18-debuginfo
webkitgtk4 (Red Hat package)

Install updates from vendor's website.

WebKitGTK+ - update to 2.32.0
WPE WebKit - update to 2.32.0
libjavascriptcoregtk-4_0-18 - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
libwebkit2gtk3-lang - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
webkit2gtk3-devel - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
webkit2gtk3-debugsource - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
webkit2gtk-4_0-injected-bundles-debuginfo - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
webkit2gtk-4_0-injected-bundles - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
typelib-1_0-WebKit2WebExtension-4_0 - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
typelib-1_0-WebKit2-4_0 - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
typelib-1_0-JavaScriptCore-4_0 - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
libwebkit2gtk-4_0-37-debuginfo - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
libwebkit2gtk-4_0-37 - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
libjavascriptcoregtk-4_0-18-debuginfo - addressed in versions 2.32.4-2.71.2, 2.32.4-12.3
webkitgtk4 (Red Hat package) - update to 2.48.3-2.el7_9

• https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1214

• Remote code execution in WebKitGTK
• SUSE Linux Enterprise Server 15 update for webkit
• Gentoo update for WebkitGTK+
• SUSE update for webkit2gtk3
• SUSE update for webkit2gtk3
• Red Hat Enterprise Linux 7 Extended Lifecycle Support update for webkitgtk4