CVE-2024-5833: Google Chrome V8 Type Confusion RCE Flaw

CVE-2024-5833 Overview

CVE-2024-5833 is a Type Confusion vulnerability affecting the V8 JavaScript engine in Google Chrome prior to version 126.0.6478.54. This vulnerability allows a remote attacker to potentially perform out-of-bounds memory access via a crafted HTML page. The flaw was assigned a Chromium security severity rating of High, reflecting its potential for significant impact on affected systems.

Type confusion vulnerabilities in V8 are particularly dangerous because V8 is Chrome's JavaScript engine, responsible for executing JavaScript code on web pages. When an attacker can manipulate the engine into treating one type of object as another, they may gain the ability to read or write memory outside of intended boundaries, potentially leading to arbitrary code execution.

Critical Impact

Remote attackers can exploit this vulnerability through malicious web pages, potentially achieving arbitrary code execution with the privileges of the Chrome browser process.

Affected Products

• Google Chrome versions prior to 126.0.6478.54
• Fedora Project Fedora 39
• Fedora Project Fedora 40

Discovery Timeline

• 2024-06-11 - CVE-2024-5833 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-5833

Vulnerability Analysis

This vulnerability (CWE-843: Type Confusion) occurs within V8, Chrome's high-performance JavaScript and WebAssembly engine. Type confusion vulnerabilities arise when code allocates or initializes an object of one type but later accesses it as a different, incompatible type. In the context of V8, this can occur during JavaScript execution when the engine's type inference or optimization passes make incorrect assumptions about object types.

When exploited, this flaw enables out-of-bounds memory access, which can result in information disclosure (reading sensitive data from process memory), corruption of adjacent memory structures, or potentially arbitrary code execution if an attacker can precisely control the memory layout.

The attack requires user interaction—specifically, the victim must visit a malicious web page containing crafted HTML and JavaScript designed to trigger the type confusion condition.

Root Cause

The root cause lies in improper type handling within the V8 JavaScript engine. Type confusion occurs when V8's Just-In-Time (JIT) compiler or interpreter incorrectly tracks or validates the type of a JavaScript object. This can happen during:

• Optimistic type assumptions made by the JIT compiler that are not properly validated
• Incorrect type transitions during object property modifications
• Flaws in inline caching mechanisms that cache incorrect type information

When the engine operates on an object with an incorrect type assumption, it may calculate wrong memory offsets or access memory regions that do not belong to the actual object, leading to out-of-bounds access.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must craft a malicious HTML page containing JavaScript code designed to trigger the type confusion in V8. The exploitation sequence typically involves:

1. The attacker hosts a malicious web page on an attacker-controlled server or injects malicious content into a compromised legitimate website
2. The victim navigates to the malicious page using a vulnerable version of Google Chrome
3. The crafted JavaScript executes within the browser context, triggering the type confusion vulnerability
4. The attacker leverages the out-of-bounds memory access to achieve their objectives, potentially including arbitrary code execution

For detailed technical analysis, refer to the Chromium Issue Tracker Entry and the Google Chrome Desktop Update announcement.

Detection Methods for CVE-2024-5833

Indicators of Compromise

• Unexpected browser crashes or instability when visiting certain websites
• Unusual memory consumption patterns in Chrome processes
• Chrome sandbox escape attempts or privilege escalation events
• Suspicious JavaScript execution patterns in browser logs

Detection Strategies

• Monitor for Chrome versions prior to 126.0.6478.54 across the enterprise environment using asset inventory tools
• Deploy endpoint detection solutions capable of identifying exploitation attempts against browser vulnerabilities
• Implement web content filtering to block access to known malicious domains hosting exploit code
• Enable Chrome's built-in crash reporting and monitor for patterns indicating exploitation attempts

Monitoring Recommendations

• Review browser crash reports for V8-related crashes that may indicate exploitation attempts
• Monitor network traffic for connections to suspicious domains immediately following browser activity
• Implement behavioral analysis to detect post-exploitation activities such as unexpected process spawning from browser contexts
• Track Chrome version deployment across the organization to identify vulnerable endpoints

How to Mitigate CVE-2024-5833

Immediate Actions Required

• Update Google Chrome to version 126.0.6478.54 or later immediately on all systems
• Enable automatic updates in Chrome to ensure timely patching of future vulnerabilities
• Apply Fedora security updates for Fedora 39 and Fedora 40 via package manager
• Educate users about the risks of visiting untrusted websites until patching is complete

Patch Information

Google has addressed this vulnerability in Chrome version 126.0.6478.54, released in June 2024. The fix was announced via the Google Chrome Desktop Update blog. Fedora Project has also released corresponding security updates for Fedora 39 and Fedora 40, available through the standard package management system.

Organizations should prioritize this update given the network-based attack vector and the potential for remote code execution without requiring elevated privileges on the attacker's part.

Workarounds

• Restrict access to untrusted websites through web filtering proxies until patches can be applied
• Consider using alternative browsers for high-risk activities if Chrome cannot be immediately updated
• Enable Chrome's Site Isolation feature to limit the impact of renderer process compromises
• Implement network segmentation to reduce the blast radius of potential browser-based attacks

# Update Chrome on Fedora systems
sudo dnf update chromium --refresh

# Verify Chrome version (should be 126.0.6478.54 or higher)
google-chrome --version

# Force Chrome update check on Linux
google-chrome --check-for-update-interval=0