Google Chrome for Windows Mojo IPC Handle Validation Sandbox Escape Vulnerability (CVE-2025-2783)

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2025-2783) stems from an incorrect handle validation flaw within the Mojo IPC (Inter-Process Communication) framework of Google Chrome on Windows. Mojo is responsible for passing messages and system handles between the low-privilege renderer process and the high-privilege browser process. Under unspecified circumstances, Mojo fails to properly validate or sanitize incoming system handles, allowing a compromised process to pass malicious handles that the browser process trusts implicitly.

2. Exploitation Mechanics & Attack Scenario

In a typical attack scenario, an attacker lures a victim into downloading or interacting with a malicious file, or compromises the renderer process via a separate web-based vulnerability. Once inside the sandboxed renderer, the attacker leverages the Mojo IPC channel to transmit a malformed message containing an invalid or specially crafted Windows handle. Because the browser process fails to validate this handle correctly, it triggers memory corruption or unauthorized resource access, enabling the attacker to bypass the sandbox boundary and execute arbitrary code on the host operating system.

3. Infrastructure & Business Impact

This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. A successful sandbox escape allows attackers to bypass Chrome's primary security boundary, leading to full endpoint compromise. For enterprises, this poses a severe risk of lateral movement, sensitive data exfiltration, and ransomware deployment across the corporate network.