CVE-2023-2033: Google Chrome V8 Type Confusion Vulnerability

CVE-2023-2033 Overview

CVE-2023-2033 is a type confusion vulnerability in V8, the JavaScript engine used by Google Chrome. This vulnerability exists in Google Chrome versions prior to 112.0.5615.121 and allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The vulnerability has been actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Critical Impact

This vulnerability enables remote attackers to achieve heap corruption through maliciously crafted web content. Active exploitation has been confirmed in the wild, making immediate patching essential for all affected systems.

Affected Products

• Google Chrome (versions prior to 112.0.5615.121)
• Debian Linux 11.0
• Fedora 36, 37, and 38
• Couchbase Server (including version 7.2.0)

Discovery Timeline

• April 14, 2023 - CVE-2023-2033 published to NVD
• October 24, 2025 - Last updated in NVD database

Technical Details for CVE-2023-2033

Vulnerability Analysis

Type confusion vulnerabilities occur when a program allocates or initializes a resource using one type but later accesses that resource using an incompatible type. In the context of V8, Chrome's JavaScript and WebAssembly engine, type confusion can lead to severe memory safety issues. When V8 incorrectly handles type information during JavaScript execution, it may access memory using assumptions about data layout that don't hold true, resulting in heap corruption.

The V8 engine performs aggressive optimizations including Just-In-Time (JIT) compilation to achieve high JavaScript performance. These optimizations rely on accurate type information. When type confusion occurs, the engine may read or write data at incorrect offsets or interpret data using wrong type semantics, leading to exploitable memory corruption conditions.

Root Cause

The root cause of CVE-2023-2033 lies in improper type handling within the V8 JavaScript engine (CWE-843: Access of Resource Using Incompatible Type). When processing certain JavaScript operations, V8 fails to properly validate type consistency, allowing an attacker to craft JavaScript code that causes the engine to misinterpret the type of an object. This type mismatch can lead to out-of-bounds memory access, corrupted object layouts, and ultimately arbitrary code execution when the confused type data is processed.

Attack Vector

The attack vector for CVE-2023-2033 is network-based and requires user interaction. An attacker must convince a victim to visit a maliciously crafted HTML page containing JavaScript designed to trigger the type confusion. The attack flow typically involves:

1. The attacker hosts or injects malicious JavaScript into a web page
2. The victim navigates to the malicious page using a vulnerable Chrome browser
3. The JavaScript executes and triggers the type confusion in V8
4. Heap corruption occurs, potentially allowing the attacker to gain code execution within the renderer process
5. Further exploitation may allow sandbox escape and full system compromise

Since this vulnerability requires no special privileges and only user interaction (visiting a web page), it represents a significant threat to end users. The confirmation of active exploitation underscores the real-world risk this vulnerability poses.

Detection Methods for CVE-2023-2033

Indicators of Compromise

• Unusual Chrome renderer process crashes or abnormal termination events
• Unexpected memory allocation patterns or heap corruption signatures in Chrome process dumps
• Evidence of Chrome browser connections to known malicious domains serving exploit code
• Anomalous JavaScript execution patterns detected by endpoint security tools

Detection Strategies

• Monitor Chrome browser version across the enterprise and flag any instances running versions prior to 112.0.5615.121
• Deploy endpoint detection rules to identify V8 heap corruption patterns and abnormal renderer process behavior
• Utilize network monitoring to detect access to known exploit kit infrastructure targeting Chrome vulnerabilities
• Enable Chrome's built-in crash reporting to collect and analyze renderer crashes that may indicate exploitation attempts

Monitoring Recommendations

• Implement browser version compliance monitoring through endpoint management solutions to ensure timely patching
• Configure SIEM rules to correlate Chrome crash events with suspicious network activity
• Review web proxy logs for indicators of malicious JavaScript delivery targeting Chrome users
• Leverage SentinelOne's behavioral AI to detect post-exploitation activity following potential browser compromise

How to Mitigate CVE-2023-2033

Immediate Actions Required

• Update Google Chrome to version 112.0.5615.121 or later immediately across all systems
• Apply corresponding security updates for Debian Linux, Fedora, and Couchbase Server as applicable
• Restrict access to untrusted websites through web filtering until patches can be deployed
• Enable automatic Chrome updates to ensure rapid deployment of future security fixes

Patch Information

Google has released Chrome version 112.0.5615.121 to address this vulnerability. Organizations should update all Chrome installations immediately. The Chrome Desktop Update April 2023 announcement provides official patch details.

For Linux distributions:

• Debian users should refer to Debian Security Advisory DSA-5390
• Fedora users should apply updates per the Fedora Package Announcements
• Gentoo users should consult GLSA 2023-09-17

Couchbase Server users should visit the Couchbase Security Alerts page for applicable updates.

Workarounds

• Disable JavaScript execution in Chrome through settings, though this significantly impacts web functionality
• Use browser isolation solutions to execute untrusted web content in isolated environments
• Implement strict web filtering policies to limit access to potentially malicious sites
• Consider temporarily using an alternative browser for high-risk browsing activities until patching is complete

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

# Check for Chrome update availability
# Navigate to chrome://settings/help in browser

# Force Chrome update via command line (varies by platform)
# Linux package manager example:
sudo apt update && sudo apt upgrade google-chrome-stable