Example analysis of Google Chrome 85 fixing WebGL code execution vulnerability

Google has fixed a use-after-free vulnerability in the WebGL (Web Graphics Library) component of the Google Chrome web browser. By successfully exploiting this vulnerability, an attacker can execute arbitrary code in the context of the browser's process.

WebGL is a JavaScript API that compliant browsers use to render interactive 2D and 3D graphics without the use of plug-ins.

This code execution vulnerability has been fixed in Google Chrome 85.0.4149.0.

High-risk code execution vulnerability

The code execution vulnerability discovered by Marcin Towalski, senior research engineer at Cisco Talos, is numbered CVE-2020-6492 and has a CVSS v3 score of 8.3.

This vulnerability triggers a crash when the WebGL component fails to properly handle objects in memory.

According to the Cisco Talos security advisory, the vulnerability exists in ANGLE, a compatibility layer between OpenGL and Direct3D used by the Chrome browser and other projects on Windows.

An attacker can exploit the use-after-free vulnerability by tampering with the correct memory layout, and ultimately execute arbitrary code in the browser environment to achieve complete control.

CVE-2020-6492 affects Google Chrome 81.0.4044.138 (Stable), 84.0.4136.5 (Dev) and 84.0.4143.7 (Canary).

Google ChromeSecurity Update

Earlier, the stable versions of Google Chrome (Chrome 84 and Chrome 83) each fixed 38 vulnerabilities, including Security vulnerabilities rated as critical and high-risk.

Chrome 84 also optimizes protection against mixed content downloads and browser notification scams, while removing insecure TLS protocols (i.e. TLS1.0 and 1.1).

Chrome 83 provides users with a host of security and privacy protections, including a redesigned "Privacy and Security" settings area, a new Security Checkup feature, a new enhanced Safe Browsing feature, and better protection of cookies. Good control, and optimized DoH settings, etc.

Because of the epidemic that has not subsided, Google did not release Chrome 82 version, but decided to skip this version and leave all modifications to the next release.

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