CVE-2024-7969: Google Chrome V8 Type Confusion RCE Flaw

CVE-2024-7969 Overview

CVE-2024-7969 is a type confusion vulnerability in the V8 JavaScript engine used by Google Chrome. This vulnerability exists in versions prior to 128.0.6613.113 and allows a remote attacker to potentially exploit heap corruption through a specially crafted HTML page. V8 is the core JavaScript and WebAssembly engine that powers Google Chrome, making this a significant security concern for all Chrome users.

Critical Impact

Remote attackers can exploit this type confusion flaw to achieve heap corruption, potentially leading to arbitrary code execution within the browser context when a user visits a malicious webpage.

Affected Products

• Google Chrome versions prior to 128.0.6613.113
• Chromium-based browsers using vulnerable V8 engine versions
• All platforms running affected Chrome versions (Windows, macOS, Linux)

Discovery Timeline

• 2024-08-21 - CVE-2024-7969 published to NVD
• 2024-08-28 - Last updated in NVD database

Technical Details for CVE-2024-7969

Vulnerability Analysis

This vulnerability stems from a type confusion issue (CWE-843) within Chrome's V8 JavaScript engine. Type confusion occurs when the engine incorrectly assumes an object belongs to a certain type when it actually belongs to a different, incompatible type. In this case, the V8 engine can be tricked into misinterpreting object types during JavaScript execution, leading to heap memory corruption.

When exploited, this vulnerability allows an attacker to manipulate memory in unexpected ways, potentially gaining control over program execution. The attack requires user interaction in the form of visiting a malicious webpage, but no authentication or special privileges are needed on the attacker's part.

Root Cause

The root cause is improper type handling within the V8 JavaScript engine's type system. Type confusion vulnerabilities in V8 typically arise when the engine's optimizing compiler (TurboFan) makes incorrect assumptions about object types during Just-In-Time (JIT) compilation. When these assumptions are violated at runtime, the engine may read or write memory using incorrect type information, corrupting heap structures.

Attack Vector

The attack is conducted remotely over the network. An attacker would craft a malicious HTML page containing JavaScript code designed to trigger the type confusion condition in V8. When a victim visits the page, the browser executes the malicious JavaScript, causing the type confusion and subsequent heap corruption.

The exploitation scenario involves:

1. Attacker creates a webpage with specially crafted JavaScript that triggers the V8 type confusion
2. Victim is lured to visit the malicious page (via phishing, malvertising, or compromised legitimate sites)
3. Chrome's V8 engine executes the JavaScript and mishandles object types
4. Heap corruption occurs, potentially allowing arbitrary code execution within the browser sandbox

For technical details on this vulnerability, refer to the Chromium Issue Tracker Entry and the Google Chrome Stable Update announcement.

Detection Methods for CVE-2024-7969

Indicators of Compromise

• Unexpected Chrome renderer process crashes or abnormal memory usage patterns
• JavaScript execution triggering unusual V8 compilation behavior or heap allocation anomalies
• Suspicious network traffic loading heavily obfuscated JavaScript content from untrusted domains
• Browser sandbox escape attempts or unexpected child process spawning

Detection Strategies

• Monitor for Chrome browser crashes with signatures related to V8 heap corruption or type confusion errors
• Implement browser version auditing across the enterprise to identify unpatched Chrome installations (versions below 128.0.6613.113)
• Deploy endpoint detection solutions capable of identifying JavaScript-based exploitation attempts
• Analyze web traffic for known malicious JavaScript patterns targeting V8 vulnerabilities

Monitoring Recommendations

• Enable Chrome's crash reporting to collect and analyze crash dumps for potential exploitation attempts
• Implement network monitoring for connections to known malicious domains serving browser exploits
• Utilize SentinelOne's behavioral AI to detect post-exploitation activities that may follow successful browser compromise
• Monitor for unusual process creation chains originating from Chrome browser processes

How to Mitigate CVE-2024-7969

Immediate Actions Required

• Update Google Chrome to version 128.0.6613.113 or later immediately across all systems
• Enable automatic Chrome updates to ensure timely security patch deployment
• Audit enterprise systems for Chrome installations and verify patch compliance
• Consider restricting access to untrusted websites until patching is complete

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 128.0.6613.113. The patch resolves the type confusion issue in the V8 JavaScript engine. Organizations should verify that Chrome installations are updated by checking chrome://settings/help in the browser.

For official patch information, see the Google Chrome Stable Update.

Workarounds

• Implement web filtering to block access to known malicious sites until patches can be applied
• Consider using enterprise browser policies to disable JavaScript on untrusted domains as a temporary measure
• Deploy network-level protections to filter potentially malicious JavaScript content
• Enable Chrome's Site Isolation feature if not already active to limit the impact of potential exploits

# Verify Chrome version via command line
# On Linux/macOS:
google-chrome --version

# On Windows PowerShell:
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.FileVersion

# Ensure version is 128.0.6613.113 or higher