CVE-2023-1213: Google Chrome Use After Free Vulnerability

CVE-2023-1213 Overview

CVE-2023-1213 is a Use After Free vulnerability in the Swiftshader component of Google Chrome prior to version 111.0.5563.64. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption by convincing a user to visit a crafted HTML page. The vulnerability exists in Swiftshader, Google's software-based implementation of Vulkan and OpenGL ES graphics APIs used as a fallback when hardware GPU acceleration is unavailable.

Critical Impact

A remote attacker can potentially achieve arbitrary code execution by exploiting heap corruption through a maliciously crafted HTML page, requiring only user interaction to visit the page.

Affected Products

• Google Chrome versions prior to 111.0.5563.64
• All platforms where Swiftshader software rendering is supported
• Systems using Chrome without hardware GPU acceleration

Discovery Timeline

• 2023-03-07 - CVE-2023-1213 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-1213

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to reference memory after it has been freed. In the context of Swiftshader, this flaw exists in the software rendering pipeline that Chrome uses when hardware GPU acceleration is unavailable or disabled.

The Swiftshader component provides a CPU-based implementation of graphics APIs, making it a critical component for rendering on systems without dedicated graphics hardware. When processing specially crafted graphics operations embedded in an HTML page, the vulnerable code path can be triggered, leading to a use-after-free condition.

Upon successful exploitation, an attacker can manipulate the heap memory layout to achieve heap corruption. This can potentially lead to arbitrary code execution within the context of the Chrome renderer process, depending on the browser's sandbox configuration and other security mitigations in place.

Root Cause

The root cause of CVE-2023-1213 lies in improper memory management within the Swiftshader graphics rendering component. Specifically, a memory object is freed but a reference to that memory is retained and subsequently accessed. This dangling pointer can be manipulated by an attacker to point to attacker-controlled data, enabling heap corruption when the freed memory is reallocated and written to.

Attack Vector

The attack vector for this vulnerability is network-based, requiring user interaction. An attacker would need to:

1. Create a malicious HTML page containing crafted content designed to trigger the vulnerable Swiftshader code path
2. Lure a victim to visit the malicious page through phishing, social engineering, or compromised legitimate websites
3. The crafted page triggers graphics rendering operations that exploit the use-after-free condition
4. Successful exploitation results in heap corruption, potentially leading to arbitrary code execution

The vulnerability mechanism involves carefully timed graphics API calls that create a race condition or specific memory allocation pattern, causing the browser to access freed memory during rendering operations. For detailed technical information, refer to the Chromium Bug Report #1411210 and the Google Chrome Desktop Update.

Detection Methods for CVE-2023-1213

Indicators of Compromise

• Unexpected Chrome renderer process crashes or hangs during web page rendering
• Anomalous memory access patterns in Chrome's Swiftshader component
• Detection of suspicious HTML pages with complex graphics operations designed to trigger software rendering
• Unusual network traffic to known malicious domains hosting exploit pages

Detection Strategies

• Monitor Chrome browser version across endpoints to identify installations running versions prior to 111.0.5563.64
• Implement browser-based threat detection to identify malicious HTML pages with exploit characteristics
• Deploy endpoint detection and response (EDR) solutions to monitor for heap corruption and anomalous process behavior
• Utilize network security tools to detect and block access to known malicious URLs hosting exploit code

Monitoring Recommendations

• Enable Chrome's built-in crash reporting to identify potential exploitation attempts
• Monitor system logs for Chrome renderer process crashes related to graphics operations
• Implement centralized browser policy management to track version compliance across the organization
• Configure SentinelOne's Singularity platform to monitor for memory corruption indicators in browser processes

How to Mitigate CVE-2023-1213

Immediate Actions Required

• Update Google Chrome to version 111.0.5563.64 or later immediately
• Enable automatic updates for Chrome browsers across all managed endpoints
• Implement browser security policies to block access to untrusted websites
• Consider temporarily disabling software rendering if immediate patching is not possible

Patch Information

Google has addressed this vulnerability in Chrome version 111.0.5563.64, released as part of the stable channel update for desktop. The fix resolves the improper memory management in the Swiftshader component that led to the use-after-free condition.

Organizations should update Chrome through their standard software update mechanisms. Enterprise deployments can use Google's enterprise policies to enforce updates. For detailed information on the security update, see the Google Chrome Desktop Update.

Workarounds

• Use hardware GPU acceleration instead of Swiftshader software rendering where possible
• Implement web content filtering to block access to untrusted or potentially malicious websites
• Deploy browser isolation solutions to contain potential exploitation attempts
• Configure Chrome policies to restrict potentially dangerous web content

# Example: Force Chrome to use hardware acceleration (when available)
# This reduces reliance on Swiftshader software rendering
chrome --ignore-gpu-blocklist --enable-gpu-rasterization

# Example: Check current Chrome version via command line
google-chrome --version

# Enterprise deployment: Use group policy or Chrome management console
# to enforce minimum browser version requirements