CVE-2024-7534: Google Chrome Heap Buffer Overflow Flaw

CVE-2024-7534 Overview

CVE-2024-7534 is a heap buffer overflow vulnerability in the Layout component of Google Chrome prior to version 127.0.6533.99. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption through a crafted HTML page, which could lead to arbitrary code execution or browser compromise when a user visits a malicious website.

Critical Impact

Remote attackers can exploit this heap buffer overflow to achieve code execution through malicious web pages, potentially compromising user systems without requiring any privileges beyond user interaction.

Affected Products

• Google Chrome versions prior to 127.0.6533.99
• Chromium-based browsers using affected Layout engine components

Discovery Timeline

• August 6, 2024 - CVE-2024-7534 published to NVD
• October 15, 2024 - Last updated in NVD database

Technical Details for CVE-2024-7534

Vulnerability Analysis

This vulnerability is classified as a heap buffer overflow (CWE-122) in Google Chrome's Layout engine. The Layout component is responsible for rendering and positioning HTML elements on web pages, a critical function that processes untrusted content from the web. When the Layout engine processes specially crafted HTML content, insufficient boundary checking allows an attacker to write data beyond the allocated heap buffer boundaries. This type of memory corruption can overwrite adjacent heap metadata or other objects, potentially allowing an attacker to hijack program control flow.

The vulnerability requires user interaction—specifically, the victim must navigate to a malicious webpage containing the crafted HTML payload. Once triggered, the heap corruption could allow an attacker to achieve arbitrary code execution within the context of the Chrome renderer process.

Root Cause

The root cause is improper bounds checking in the Layout component when handling specific HTML page structures. The code fails to properly validate buffer sizes before writing data during layout calculations, resulting in an out-of-bounds write condition (CWE-787) that corrupts heap memory. This is a classic buffer overflow scenario where input data exceeds the expected bounds of allocated memory regions.

Attack Vector

The attack vector is network-based, requiring the victim to visit a malicious website or be redirected to one containing the exploit payload. An attacker would craft a specially designed HTML page that triggers the vulnerable code path in Chrome's Layout engine. When the browser parses and renders this malicious content, the heap buffer overflow occurs, potentially allowing the attacker to execute arbitrary code with the privileges of the browser process.

The attack chain typically involves:

1. Attacker hosts or injects malicious HTML content on a web server
2. Victim navigates to the compromised webpage
3. Chrome's Layout engine processes the malicious HTML
4. Buffer overflow corrupts heap memory
5. Attacker achieves code execution or causes denial of service

Detection Methods for CVE-2024-7534

Indicators of Compromise

• Unexpected Chrome crashes or renderer process terminations when visiting specific websites
• Memory corruption alerts from endpoint protection solutions during browser activity
• Anomalous child process spawning from Chrome renderer processes
• Suspicious network connections initiated by Chrome processes after visiting unknown sites

Detection Strategies

• Monitor for Chrome versions below 127.0.6533.99 across the enterprise using software inventory tools
• Deploy endpoint detection rules for heap spray patterns and exploitation techniques targeting browsers
• Implement web proxy logging to identify access to known malicious domains serving exploit kits
• Enable crash dump collection and analysis for Chrome processes to identify exploitation attempts

Monitoring Recommendations

• Configure SentinelOne agents to detect and alert on browser process anomalies and memory corruption indicators
• Implement network-based detection for malicious HTML payloads targeting browser vulnerabilities
• Monitor browser crash reports for patterns indicating active exploitation attempts
• Enable enhanced logging for Chrome enterprise deployments to track rendering errors

How to Mitigate CVE-2024-7534

Immediate Actions Required

• Update Google Chrome to version 127.0.6533.99 or later immediately across all systems
• Enable automatic Chrome updates to ensure timely patching of future vulnerabilities
• Implement browser isolation technologies for high-risk users or sensitive environments
• Review and restrict access to untrusted websites through web filtering solutions

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 127.0.6533.99. The fix was announced in the Chrome Stable Channel Update for Desktop. Organizations should deploy this update as a priority given the potential for remote code execution. Additional details about the underlying issue can be found in the Chromium Issue Tracker.

Workarounds

• Enable Chrome's Site Isolation feature to limit the impact of renderer exploits
• Consider using browser extensions that block JavaScript on untrusted sites until patches can be deployed
• Implement network-level filtering to block access to known malicious domains
• Deploy application whitelisting to prevent unauthorized code execution even if exploitation succeeds

# Verify Chrome version on Linux/macOS
google-chrome --version
# Expected output: Google Chrome 127.0.6533.99 or higher

# Force Chrome update check (Windows PowerShell)
Start-Process "chrome://settings/help"

# Enterprise deployment via Group Policy
# Set UpdateDefault policy to enable auto-updates
# HKLM\SOFTWARE\Policies\Google\Update\UpdateDefault = 1