External risk intelligence

Chrome WebRTC Use After Free Sandbox Escape Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2022-4924

This vulnerability exists within the browser renderer process and requires a user to navigate to a crafted HTML page to be exploited. It is a client-side issue rather than a public-facing network service, edge gateway, or externally reachable management interface.

Use After Free

Google Chrome

before 97.0.4692.71

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Google Chrome's WebRTC component could allow an attacker to escape the browser's security sandbox by tricking a user into visiting a malicious web page. This could potentially lead to broader system compromise.

  • Affects a widely used browser technology.
  • Matters due to potential sandbox escape.
  • Confirm relevance; widespread browser use implies potential exposure.

Attack Path

How an attacker could exploit the issue

A remote attacker who has already compromised the browser's renderer process could leverage this vulnerability by tricking a user into visiting a malicious webpage. This could potentially allow the attacker to escape the browser's sandbox, gaining broader access to the system.

  • Requires compromised renderer process.
  • Triggered by a crafted HTML page.
  • Risk of sandbox escape.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability, when a user visits a malicious web page, could allow an attacker to escape the browser's sandbox. This could lead to attackers accessing or manipulating data within the browser process.

  • Browser sandbox escape.
  • User visits a crafted HTML page.
  • Access to browser process data.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-world remediation likely involves the platform or infrastructure team responsible for browser deployment, in coordination with security operations to confirm exposure. The first step is to inventory where the affected browser is installed, assess its reachability and criticality, and identify the asset owners. Subsequently, a risk-based remediation plan, including potential vendor coordination or temporary mitigations, should be developed.

  • Platform/Infrastructure teams own remediation.
  • Verify browser deployment and reachability.
  • Plan remediation based on risk.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is Google Chrome's WebRTC component?

WebRTC, or Web Real-Time Communication, is a technology integrated into Google Chrome that enables browsers to exchange audio, video, and data streams directly with each other. It is the engine powering modern browser-based conferencing, live streaming, and interactive web applications.

What does CWE-416 mean in the context of CVE-2022-4924?

CWE-416, or Use After Free, is a memory safety weakness. It occurs when a program continues to use a memory address after it has been cleared or deleted. In this CVE, it allows an attacker to manipulate memory to potentially escape the browser's security sandbox, which is designed to isolate web content from your actual operating system.

How is this vulnerability triggered?

An attacker must trick a user into visiting a specifically crafted, malicious HTML page. The vulnerability is not triggered by simply having the browser open or by network traffic hitting a server. It requires the browser's renderer process to be compromised first, meaning the attack depends on the user interacting with malicious web content.

Do I need to worry about this if I use Chrome internally?

According to Halo Surface Signal, this is very unlikely to be a direct target for external network exploitation. Because it is a client-side browser issue rather than a public-facing network service or gateway, the primary risk is limited to users navigating to malicious sites. Internal environments are just as affected as external ones if users browse the open internet.

When should I update my browser to fix this?

You should ensure your browser is updated beyond version 97.0.4692.71 immediately. Since this involves the browser's core sandbox protections, the primary path forward is confirming your installed versions are current and ensuring your organization's update policies are active for all endpoints running the software.

References