CVE-2024-1670: Google Chrome Use After Free Vulnerability

CVE-2024-1670 Overview

CVE-2024-1670 is a use-after-free vulnerability in the Mojo inter-process communication (IPC) component of Google Chrome prior to version 122.0.6261.57. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption by convincing a victim to visit a maliciously crafted HTML page. The vulnerability occurs when Chrome's Mojo subsystem improperly handles memory after it has been freed, creating conditions that could lead to arbitrary code execution within the browser context.

Critical Impact

Successful exploitation could allow attackers to achieve remote code execution, compromise browser integrity, and potentially gain access to sensitive user data through heap corruption.

Affected Products

• Google Chrome versions prior to 122.0.6261.57
• Fedora Project Fedora 38
• Fedora Project Fedora 39

Discovery Timeline

• February 20, 2024 - Google releases security patch in Chrome 122.0.6261.57
• February 21, 2024 - CVE-2024-1670 published to NVD
• December 19, 2024 - Last updated in NVD database

Technical Details for CVE-2024-1670

Vulnerability Analysis

This vulnerability exists in the Mojo component of Google Chrome, which serves as the foundational IPC mechanism for communication between Chrome's sandboxed processes. Use-after-free vulnerabilities in this layer are particularly dangerous because Mojo handles critical inter-process data marshalling and message passing across Chrome's multi-process architecture.

When memory is freed but a reference to that memory location is retained and subsequently accessed, an attacker can potentially manipulate the freed memory region. In the context of heap corruption, this can allow attackers to overwrite function pointers, object vtables, or other critical data structures, ultimately leading to control flow hijacking.

The vulnerability requires user interaction—specifically, the victim must navigate to or be redirected to a malicious web page containing specially crafted HTML content designed to trigger the vulnerable code path in the Mojo subsystem.

Root Cause

The root cause is a use-after-free condition (CWE-416) in Chrome's Mojo IPC framework. This occurs when an object is deallocated but a dangling pointer continues to reference the freed memory. Subsequent operations on this stale reference can lead to memory corruption when the freed heap region is reallocated for other purposes and then accessed through the dangling pointer.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must host or inject malicious HTML content that exploits the Mojo use-after-free condition. The attack scenario typically involves:

1. The attacker creates a malicious web page with crafted HTML content that triggers the vulnerable Mojo code path
2. The victim is lured to visit the malicious page through phishing, malvertising, or compromised legitimate websites
3. Upon rendering the malicious content, Chrome's Mojo component processes the data, triggering the use-after-free condition
4. The attacker-controlled data is used to corrupt heap structures, potentially achieving code execution within the renderer process sandbox

Due to the sensitive nature of this vulnerability and its potential for exploitation, specific proof-of-concept code is not publicly disclosed. For technical details, refer to the Chromium Issue Tracker Entry which may contain additional information once the issue is fully disclosed.

Detection Methods for CVE-2024-1670

Indicators of Compromise

• Unexpected Chrome crashes or instability, particularly when visiting unfamiliar websites
• Anomalous memory access patterns in Chrome processes detected by endpoint security solutions
• Suspicious outbound network connections following Chrome rendering of unknown web content
• Crash reports indicating heap corruption or use-after-free conditions in Mojo components

Detection Strategies

• Monitor Chrome version across endpoints and flag installations below version 122.0.6261.57
• Deploy browser-based threat detection solutions capable of identifying memory corruption attempts
• Implement network security monitoring to detect and block known malicious domains serving exploit content
• Utilize SentinelOne's behavioral AI to detect anomalous process behavior indicative of memory exploitation attempts

Monitoring Recommendations

• Enable Chrome crash reporting and analyze dumps for signatures matching use-after-free exploitation patterns
• Implement endpoint detection rules that alert on Chrome child processes exhibiting abnormal memory behavior
• Monitor for unexpected code execution or shellcode patterns within Chrome renderer processes
• Track browser plugin and extension installations that could be used as attack vectors

How to Mitigate CVE-2024-1670

Immediate Actions Required

• Update Google Chrome to version 122.0.6261.57 or later immediately across all endpoints
• Enable Chrome's automatic update mechanism to ensure timely patching of future vulnerabilities
• For Fedora users, apply the latest package updates from the official repositories
• Consider implementing browser isolation technologies for high-risk users to contain potential exploitation

Patch Information

Google has addressed this vulnerability in Chrome version 122.0.6261.57, released on February 20, 2024. The fix is included in the stable channel update for desktop platforms. Organizations should reference the Google Chrome Stable Update announcement for complete details.

For Fedora users, security updates have been released through the official package announcement channels for Fedora 38 and Fedora 39.

Workarounds

• If immediate patching is not possible, consider temporarily using an alternative browser until Chrome can be updated
• Implement strict web filtering policies to block access to untrusted or suspicious websites
• Enable site isolation in Chrome to limit the impact of renderer process compromise
• Deploy network-level protections to block known malicious content delivery networks

# Verify Chrome version on Linux systems
google-chrome --version
# Expected output: Google Chrome 122.0.6261.57 or higher

# Update Chrome on Fedora
sudo dnf update chromium

# Check automatic updates are enabled in Chrome
# Navigate to: chrome://settings/help