CVE-2024-3833: Google Chrome WebAssembly RCE Vulnerability

CVE-2024-3833 Overview

CVE-2024-3833 is a high-severity object corruption vulnerability in the WebAssembly (WASM) component of Google Chrome. This flaw exists in Chrome versions prior to 124.0.6367.60 and allows a remote attacker to potentially exploit object corruption via a crafted HTML page. The vulnerability requires user interaction, where a victim must navigate to a malicious webpage containing specially crafted WebAssembly code.

Critical Impact

Remote attackers can potentially achieve arbitrary code execution through object corruption in Chrome's WebAssembly engine, compromising confidentiality, integrity, and availability of affected systems.

Affected Products

• Google Chrome versions prior to 124.0.6367.60
• Fedora 38 (with bundled Chromium)
• Fedora 39 (with bundled Chromium)
• Fedora 40 (with bundled Chromium)

Discovery Timeline

• April 17, 2024 - CVE-2024-3833 published to NVD
• December 19, 2024 - Last updated in NVD database

Technical Details for CVE-2024-3833

Vulnerability Analysis

This vulnerability involves object corruption within Chrome's WebAssembly implementation. WebAssembly is a binary instruction format designed for efficient execution in web browsers, and corruption of its internal objects can lead to memory safety violations. The flaw allows attackers to manipulate WebAssembly objects in ways that were not intended by the browser's security model.

The vulnerability is exploitable over the network without requiring any prior authentication or privileges. However, it does require user interaction—specifically, the victim must visit a malicious webpage or be redirected to one containing the crafted exploit payload. Once triggered, the object corruption can potentially be leveraged to gain unauthorized access to the browser process, leading to compromise of user data or further system exploitation.

Root Cause

The root cause of CVE-2024-3833 lies in improper handling of WebAssembly objects within Chrome's V8 JavaScript engine. The vulnerability is classified under CWE-374 (Passing Mutable Objects to an Untrusted Method), indicating that internal objects may be improperly exposed or modified during WebAssembly execution. This can result in corrupted object state that an attacker can leverage for exploitation.

Attack Vector

The attack vector is network-based, requiring the attacker to host or inject malicious content on a webpage. The attack flow typically involves:

1. Attacker crafts a malicious HTML page containing WebAssembly code designed to trigger the object corruption
2. Victim is lured to visit the malicious page through phishing, malvertising, or compromised legitimate websites
3. The crafted WebAssembly code executes in the victim's browser, triggering the object corruption vulnerability
4. Successful exploitation can lead to arbitrary code execution within the browser's sandbox or potentially beyond

The vulnerability exists in Chrome's handling of WebAssembly objects, where crafted WASM bytecode can corrupt internal object structures. Exploitation typically involves manipulating WebAssembly memory operations or object references to achieve arbitrary read/write primitives. For detailed technical analysis, refer to the Chromium Issue #331383939.

Detection Methods for CVE-2024-3833

Indicators of Compromise

• Unusual WebAssembly module loading patterns from untrusted or suspicious domains
• Browser crashes or unexpected behavior when visiting specific websites
• Memory corruption signatures in Chrome crash dumps referencing V8 or WASM components
• Network traffic to known malicious domains hosting WebAssembly exploits

Detection Strategies

• Monitor for Chrome versions prior to 124.0.6367.60 across the enterprise using endpoint management tools
• Implement web content filtering to detect and block suspicious WebAssembly payloads
• Deploy browser-based threat detection capable of identifying anomalous WASM execution patterns
• Utilize SentinelOne Singularity to detect exploitation attempts targeting browser memory corruption vulnerabilities

Monitoring Recommendations

• Enable Chrome's crash reporting to capture and analyze memory corruption events
• Monitor endpoint telemetry for browser process anomalies such as unexpected child process spawning
• Implement DNS and network monitoring to identify connections to known malware distribution sites
• Review browser extension activity that may be used as an attack vector

How to Mitigate CVE-2024-3833

Immediate Actions Required

• Update Google Chrome to version 124.0.6367.60 or later immediately across all endpoints
• For Fedora systems, apply the latest Chromium package updates from official repositories
• Consider temporarily disabling WebAssembly in Chrome via chrome://flags/#enable-webassembly for high-risk environments until patching is complete
• Implement network-level filtering to block known malicious domains serving WASM exploits

Patch Information

Google has released Chrome version 124.0.6367.60 which addresses this vulnerability. The fix was included in the Chrome Stable Channel Update for Desktop on April 16, 2024. Fedora users should apply updates through their package manager using the security advisories published for Fedora 38, 39, and 40.

Workarounds

• Disable WebAssembly execution in Chrome by navigating to chrome://flags/#enable-webassembly and setting it to Disabled (note: this may break legitimate web applications)
• Use browser isolation solutions to execute untrusted web content in sandboxed environments
• Implement strict Content Security Policy (CSP) headers on internal web applications to restrict WebAssembly execution
• Deploy endpoint protection solutions like SentinelOne that can detect and prevent exploitation attempts

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

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

# Check for available security updates on Fedora
sudo dnf check-update chromium