Google Chrome Media Component Use-After-Free Vulnerability (CVE-2020-6572) Technical Analysis and Mitigation Guide

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2020-6572) is a Use-After-Free (UAF) flaw within the Media processing component of Google Chrome. It occurs when the browser fails to properly manage the lifecycle of memory objects used during the handling of media streams (such as audio or video). When an object is freed from memory but a dangling pointer still references its address, subsequent attempts to access or manipulate this pointer can lead to memory corruption and control flow hijacking.

2. Exploitation Mechanics & Attack Scenario

An attacker exploits this vulnerability by hosting a malicious HTML page containing specifically crafted media elements and JavaScript. When a victim visits the page, the browser attempts to parse the media content, triggering premature memory deallocation of a critical object. The attacker then utilizes heap manipulation techniques (such as heap spraying) to populate the freed memory space with controlled payloads. When the browser references the dangling pointer, it executes the attacker's payload within the context of the browser process.

3. Infrastructure & Business Impact

As this vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, it has been actively exploited in the wild. In an enterprise environment, successful exploitation can lead to complete endpoint compromise if an employee visits a compromised or malicious website. This can serve as an initial entry point for lateral movement, sensitive data exfiltration, or ransomware deployment across the corporate network.