Use-after-free in WebKitGTK+ and WPE WebKit - CVE-2021-21775

Vulnerability identifier: #VU53782

CSH Severity: High

CVSS v4.0: 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/E:P/U:Amber

CVE-ID: CVE-2021-21775

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

Affected software:
WebKitGTK+
WPE WebKit
Arch Linux
Gentoo Linux
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE CaaS Platform
SUSE Enterprise Storage
SUSE OpenStack Cloud
SUSE Linux Enterprise Server
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
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)
libsoup-lang
typelib-1_0-Soup-2_4
libsoup-devel
libsoup-debugsource
libsoup-2_4-1-debuginfo
libsoup-2_4-1

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when 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.

Install updates from vendor's website.

• https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1229