CVE-2024-5493: Google Chrome Buffer Overflow Vulnerability

CVE-2024-5493 Overview

A heap buffer overflow vulnerability exists in the WebRTC component of Google Chrome prior to version 125.0.6422.141. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption through a specially crafted HTML page. The vulnerability is classified with high severity by the Chromium security team and poses significant risk to user systems when visiting malicious websites.

Critical Impact

Remote attackers can exploit heap corruption via malicious web pages, potentially achieving arbitrary code execution and full system compromise without requiring any privileges.

Affected Products

• Google Chrome versions prior to 125.0.6422.141
• Canonical Ubuntu Linux 22.04 LTS
• Fedora 39 and Fedora 40

Discovery Timeline

• May 30, 2024 - CVE-2024-5493 published to NVD
• December 26, 2024 - Last updated in NVD database

Technical Details for CVE-2024-5493

Vulnerability Analysis

This vulnerability is classified under CWE-787 (Out-of-bounds Write) and CWE-122 (Heap-based Buffer Overflow), indicating a memory safety issue in the WebRTC implementation. WebRTC (Web Real-Time Communication) is a critical browser component enabling peer-to-peer audio, video, and data sharing functionality.

The heap buffer overflow occurs when processing specially crafted data within the WebRTC subsystem. When a user visits a malicious webpage containing crafted HTML content, the browser's WebRTC component can be triggered to write data beyond the bounds of an allocated heap buffer. This memory corruption can lead to arbitrary code execution in the context of the browser process, potentially allowing attackers to escape the browser sandbox and compromise the underlying system.

The attack requires user interaction in the form of visiting a malicious webpage, but no additional privileges are needed by the attacker. The vulnerability affects the confidentiality, integrity, and availability of the targeted system.

Root Cause

The root cause is a heap-based buffer overflow in the WebRTC component's data processing routines. The vulnerability stems from insufficient bounds checking when handling input data, allowing an attacker to cause memory writes beyond the allocated buffer boundaries. This type of memory safety issue is particularly dangerous in C/C++ codebases where manual memory management is required.

Attack Vector

The attack vector is network-based, requiring an attacker to host or inject malicious HTML content on a webpage that a victim must visit. The exploitation flow involves:

1. Attacker crafts a malicious HTML page with specially designed content targeting the WebRTC vulnerability
2. Victim navigates to the malicious page or is redirected through social engineering
3. The browser's WebRTC component processes the malicious content
4. Heap corruption occurs, potentially allowing arbitrary code execution
5. Attacker gains control of the browser process, which may lead to further system compromise

The vulnerability does not require any authentication or special privileges, making it particularly attractive for drive-by download attacks and watering hole campaigns.

Detection Methods for CVE-2024-5493

Indicators of Compromise

• Unusual browser crashes or instability, particularly when accessing WebRTC-enabled sites
• Unexpected network connections originating from browser processes
• Memory access violations or heap corruption errors logged in browser crash reports
• Suspicious JavaScript or HTML content attempting to invoke WebRTC APIs with malformed data

Detection Strategies

• Monitor browser version deployments across the enterprise to identify unpatched Chrome installations below 125.0.6422.141
• Implement web filtering to block known malicious domains distributing WebRTC exploits
• Deploy endpoint detection and response (EDR) solutions to identify anomalous browser behavior indicative of exploitation
• Enable browser telemetry and crash reporting to identify potential exploitation attempts

Monitoring Recommendations

• Audit Chrome browser versions across all endpoints using software inventory tools
• Configure alerting for browser process crashes that may indicate exploitation attempts
• Monitor for unusual child process spawning from Chrome browser processes
• Review network traffic for connections to untrusted WebRTC signaling servers

How to Mitigate CVE-2024-5493

Immediate Actions Required

• Update Google Chrome to version 125.0.6422.141 or later immediately across all systems
• Enable automatic updates for Chrome browsers to receive future security patches
• Consider temporarily disabling WebRTC functionality if updates cannot be immediately applied
• Educate users about the risks of visiting untrusted websites

Patch Information

Google has released a stable channel update addressing this vulnerability. The fix is included in Chrome version 125.0.6422.141 and later. For detailed information about the update, refer to the Chrome Blog Update Announcement. Additional technical details can be found in the Chromium Issue Tracker Entry.

Linux distribution users should apply the relevant security updates:

• Fedora users should refer to the Fedora Package Announcement for updated packages

Workarounds

• If immediate patching is not possible, consider using browser extensions that disable or restrict WebRTC functionality
• Implement network segmentation to limit the impact of potential browser compromises
• Deploy web application firewalls (WAF) or proxy solutions to filter potentially malicious web content
• Consider using alternative browsers while awaiting patch deployment, though this is not recommended as a long-term solution

# Check Chrome version on Linux systems
google-chrome --version

# Force Chrome update via command line
google-chrome --check-for-update-interval=1

# Disable WebRTC via Chrome flags (temporary workaround)
# Navigate to chrome://flags and search for WebRTC settings