CVE-2023-0128: Google Chrome Use After Free Vulnerability

CVE-2023-0128 Overview

CVE-2023-0128 is a Use After Free vulnerability affecting Google Chrome's Overview Mode feature on Chrome OS. This memory corruption flaw exists in versions prior to 109.0.5414.74 and allows a remote attacker to potentially exploit heap corruption through a crafted HTML page. Successful exploitation requires the attacker to convince a user to engage in specific UI interactions, making this a social engineering-assisted attack vector.

Critical Impact

Successful exploitation of this Use After Free vulnerability could allow attackers to achieve arbitrary code execution, potentially leading to complete system compromise, data theft, or installation of malware on affected Chrome OS devices.

Affected Products

• Google Chrome versions prior to 109.0.5414.74
• Google Chrome OS (all versions with vulnerable Chrome)

Discovery Timeline

• January 10, 2023 - CVE-2023-0128 published to NVD
• May 5, 2025 - Last updated in NVD database

Technical Details for CVE-2023-0128

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to use memory after it has been freed. In the context of Chrome's Overview Mode on Chrome OS, the vulnerability manifests when handling specific UI interactions that trigger improper memory management.

The Overview Mode is a Chrome OS feature that displays all open windows in a grid layout, allowing users to quickly switch between applications. The vulnerability exists in the underlying code that manages window objects and their associated resources during Overview Mode transitions.

When exploited, the freed memory can be reallocated and manipulated by an attacker, leading to heap corruption. This can result in arbitrary read/write primitives that enable code execution within the Chrome browser sandbox or potentially escape the sandbox entirely on vulnerable configurations.

Root Cause

The root cause of CVE-2023-0128 is improper lifecycle management of objects within the Overview Mode component. When certain UI interactions occur in a specific sequence, the code fails to properly track object references, resulting in a dangling pointer. Subsequent access to this dangling pointer triggers the use-after-free condition, allowing heap memory corruption.

This class of vulnerability is particularly dangerous in browser contexts because the rendering engine processes untrusted HTML and JavaScript content, providing attackers with precise control over memory allocation patterns.

Attack Vector

The attack vector for this vulnerability is network-based and requires user interaction. An attacker must craft a malicious HTML page designed to trigger the vulnerable code path and host it on a web server or inject it into a legitimate website. The victim must then:

1. Navigate to the malicious page using Google Chrome on Chrome OS
2. Engage in specific UI interactions that trigger Overview Mode
3. These interactions cause the use-after-free condition to occur

The attacker can use JavaScript to spray the heap with controlled data, increasing the likelihood of successful exploitation when the freed memory is reallocated. By carefully crafting the heap layout, attackers can achieve reliable code execution.

Detection Methods for CVE-2023-0128

Indicators of Compromise

• Unexpected Chrome browser crashes, particularly when entering or exiting Overview Mode on Chrome OS
• Unusual process spawning from Chrome browser processes
• Chrome crash reports referencing memory corruption in Overview Mode-related components
• Suspicious network connections originating from Chrome processes following browser crashes

Detection Strategies

• Monitor Chrome crash reports and telemetry data for patterns indicating memory corruption in Overview Mode
• Implement browser version auditing to identify instances running vulnerable Chrome versions (prior to 109.0.5414.74)
• Deploy endpoint detection rules to identify exploitation attempts targeting browser memory corruption vulnerabilities
• Analyze web traffic for pages containing JavaScript patterns commonly used in heap spray attacks

Monitoring Recommendations

• Enable Chrome Enhanced Protection mode to receive warnings about dangerous sites
• Monitor Chrome OS device logs for browser stability issues that may indicate exploitation attempts
• Implement centralized logging for Chrome crash reports across the enterprise
• Use browser isolation solutions to contain potential exploitation of browser vulnerabilities

How to Mitigate CVE-2023-0128

Immediate Actions Required

• Update Google Chrome to version 109.0.5414.74 or later immediately
• Verify Chrome auto-update functionality is enabled and working correctly on all managed devices
• Audit enterprise environments to identify any Chrome installations running vulnerable versions
• Consider temporarily restricting access to untrusted websites on Chrome OS devices until patching is complete

Patch Information

Google has addressed this vulnerability in Chrome version 109.0.5414.74. The fix was included in the stable channel update released in January 2023. Organizations should reference the Google Chrome Update Announcement for complete details on all security fixes included in this release.

Additional security advisories have been published by Gentoo Linux (GLSA 2023-05-10 and GLSA 2023-11-11) for users running Chrome on Gentoo systems.

For technical details on the vulnerability, refer to Chromium Bug Report #1353208.

Workarounds

• Implement browser isolation or sandboxing solutions to limit the impact of potential browser compromises
• Enable Chrome's Site Isolation feature to provide additional protection against renderer exploits
• Consider using managed Chrome policies to restrict access to high-risk websites until patches are deployed
• Deploy web filtering solutions to block access to known malicious domains

# Verify Chrome version on Chrome OS (press Ctrl+Alt+T to open crosh)
chrome://version

# Force Chrome update check on managed devices via policy
# Set update policy in Google Admin Console:
# Device management > Chrome > Settings > Device update settings
# Set "Auto-update settings" to "Allow auto-updates"