CVE-2024-9369: Google Chrome Mojo RCE Vulnerability

CVE-2024-9369 Overview

CVE-2024-9369 is a critical vulnerability affecting Google Chrome's Mojo component, a cross-platform IPC framework used for inter-process communication within the browser. The vulnerability stems from insufficient data validation that allows an attacker who has already compromised the renderer process to perform an out-of-bounds memory write. This memory corruption vulnerability can be exploited through a specially crafted HTML page, potentially leading to arbitrary code execution with elevated privileges beyond the browser sandbox.

Critical Impact

An attacker who has compromised the renderer process can escape the browser sandbox and execute arbitrary code on the victim's system by triggering an out-of-bounds memory write through maliciously crafted web content.

Affected Products

• Google Chrome versions prior to 129.0.6668.89
• Chromium-based browsers using vulnerable Mojo component versions

Discovery Timeline

• 2024-11-27 - CVE-2024-9369 published to NVD
• 2025-11-20 - Last updated in NVD database

Technical Details for CVE-2024-9369

Vulnerability Analysis

This vulnerability exists within Google Chrome's Mojo subsystem, which serves as the browser's inter-process communication (IPC) framework. Mojo facilitates communication between different browser processes, including the renderer process (which handles web content) and more privileged browser processes.

The flaw is classified as CWE-1284 (Improper Validation of Specified Quantity in Input), indicating that the vulnerable code fails to properly validate data quantities before using them in memory operations. When processing certain IPC messages, the Mojo component does not adequately validate input data, allowing crafted values to trigger an out-of-bounds memory write condition.

This vulnerability is particularly concerning because it represents a sandbox escape primitive. While modern browsers isolate web content in sandboxed renderer processes, this flaw allows an attacker who has already compromised the renderer (through another vulnerability) to break out of the sandbox by corrupting memory in more privileged processes.

Root Cause

The root cause is insufficient validation of data passed through Mojo IPC messages. When handling serialized data structures, the affected code fails to verify that specified quantities or offsets remain within expected bounds before performing memory operations. This improper input validation allows attackers to specify malicious values that cause writes to memory locations outside the intended buffer boundaries.

Attack Vector

Exploitation requires user interaction—specifically, the victim must visit a malicious webpage containing crafted HTML/JavaScript content. The attack chain typically involves:

1. The attacker hosts a malicious webpage with specially crafted content
2. The victim navigates to the malicious page in a vulnerable Chrome version
3. The attacker leverages another vulnerability or technique to compromise the renderer process
4. Once the renderer is compromised, the attacker crafts malicious Mojo IPC messages
5. These messages trigger the out-of-bounds write in a more privileged process
6. The attacker achieves code execution outside the sandbox with elevated privileges

The vulnerability leverages the network attack vector, as the malicious content can be delivered remotely through any website the victim visits.

Detection Methods for CVE-2024-9369

Indicators of Compromise

• Unexpected crashes in Chrome browser processes, particularly those involving Mojo IPC handling
• Abnormal memory access patterns or memory corruption signatures in browser process memory
• Suspicious child process spawning from Chrome browser processes
• Evidence of renderer process compromise followed by unusual inter-process communication activity

Detection Strategies

• Monitor Chrome crash reports and telemetry for patterns consistent with memory corruption exploits
• Implement browser version auditing to identify unpatched Chrome installations across the environment
• Deploy endpoint detection solutions capable of identifying browser exploitation attempts and sandbox escape techniques
• Analyze network traffic for known malicious infrastructure associated with Chrome exploit distribution

Monitoring Recommendations

• Enable enhanced logging for Chrome browser events and crash dumps in enterprise environments
• Configure SentinelOne agents to monitor for suspicious process behavior originating from browser processes
• Establish baseline browser behavior patterns to detect anomalous IPC activity or memory access
• Monitor for unauthorized code execution attempts following browser process compromise

How to Mitigate CVE-2024-9369

Immediate Actions Required

• Update Google Chrome to version 129.0.6668.89 or later immediately across all systems
• Enable automatic Chrome updates to ensure timely patching of future vulnerabilities
• Audit all Chromium-based browsers in the environment for vulnerable versions
• Consider implementing browser isolation technologies for high-risk users or sensitive environments
• Review endpoint protection configurations to ensure browser exploit detection is enabled

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 129.0.6668.89. Organizations should prioritize updating to this version or later. The fix implements proper validation of data quantities and bounds checking in the affected Mojo IPC code paths, preventing the out-of-bounds write condition.

For detailed patch information, refer to the Google Chrome Update Announcement and the Chromium Issue Tracker Entry.

Workarounds

• Restrict access to untrusted websites until patching is complete
• Consider using alternative browsers temporarily if immediate patching is not feasible
• Enable site isolation and strict site process isolation in Chrome enterprise policies
• Deploy web filtering solutions to block access to known malicious domains that may host exploit code
• Implement network-level controls to limit exposure to potentially malicious web content

# Verify Chrome version on Linux/macOS
google-chrome --version
# Expected: Google Chrome 129.0.6668.89 or higher

# Force Chrome update check (Windows - run as administrator)
# Navigate to chrome://settings/help to trigger update check

# Enterprise deployment: Use Chrome management policies
# to enforce minimum version requirements