CVE-2023-3728 in Chrome
Summary
by MITRE • 08/02/2023
Use after free in WebRTC in Google Chrome prior to 115.0.5790.98 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 08/09/2023
The vulnerability identified as CVE-2023-3728 represents a critical use-after-free condition within the WebRTC implementation of Google Chrome browsers prior to version 115.0.5790.98. This flaw resides in the browser's handling of WebRTC (Web Real-Time Communication) functionality which enables real-time communication between browsers without requiring intermediate servers. The issue stems from improper memory management where freed memory blocks are still referenced after their intended use period, creating a potential exploitation vector for remote attackers. The vulnerability's classification as high severity by Chromium security team indicates the significant risk it poses to user systems and data integrity.
The technical exploitation of this use-after-free vulnerability occurs when a malicious actor crafts a specially designed HTML page that triggers the flawed WebRTC code path. During normal operation, WebRTC components allocate memory for handling media streams and communication sessions, but due to inadequate memory deallocation and reference management, certain code paths can cause memory to be freed while still being referenced. This creates a scenario where subsequent memory operations can corrupt heap data structures or allow attackers to manipulate memory contents. The flaw specifically affects the WebRTC implementation's handling of media stream objects and their associated memory allocations, making it particularly dangerous in the context of browser-based real-time communication.
From an operational perspective, this vulnerability presents a substantial risk to end users as it allows remote code execution through web-based attacks without requiring user interaction beyond visiting a malicious webpage. Attackers can leverage this flaw to execute arbitrary code on victim systems, potentially leading to full system compromise, data exfiltration, or persistent backdoor installation. The impact extends beyond individual users to enterprise environments where browser-based attacks are commonly used for initial access and lateral movement. The vulnerability's presence in the WebRTC stack means that any web application utilizing real-time communication features becomes a potential attack surface, making it particularly concerning for organizations relying on browser-based collaborative tools and communication platforms.
Organizations should immediately update to Chrome version 115.0.5790.98 or later to remediate this vulnerability, as the patch addresses the underlying memory management issues in the WebRTC implementation. Additional mitigations include implementing web application firewalls, monitoring for suspicious WebRTC-related network traffic, and maintaining strict browser update policies. Security teams should also consider deploying browser isolation solutions and monitoring for exploitation attempts targeting this specific vulnerability. The flaw aligns with CWE-416 which describes use-after-free vulnerabilities, and represents a technique commonly used in exploit development against browser components. This vulnerability demonstrates the ongoing challenges in memory safety within complex browser implementations and underscores the importance of continuous security auditing and timely patch management in maintaining secure computing environments.