CVE-2023-1531: Google Chrome Use After Free Vulnerability

CVE-2023-1531 Overview

CVE-2023-1531 is a Use After Free vulnerability in the ANGLE (Almost Native Graphics Layer Engine) component of Google Chrome prior to version 111.0.5563.110. This vulnerability allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. ANGLE is a graphics abstraction layer used by Chrome to translate OpenGL ES calls to the native graphics API on various platforms, making this a critical attack surface for browser exploitation.

Critical Impact

Successful exploitation of this Use After Free vulnerability could allow attackers to achieve arbitrary code execution within the context of the browser process through heap corruption, potentially leading to complete system compromise when combined with sandbox escape techniques.

Affected Products

• Google Chrome versions prior to 111.0.5563.110
• Fedora Project Fedora versions 36, 37, and 38
• Chromium versions prior to the patched release

Discovery Timeline

• 2023-03-21 - CVE-2023-1531 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-1531

Vulnerability Analysis

This vulnerability resides in the ANGLE component of Google Chrome, which serves as a critical graphics translation layer. The Use After Free condition occurs when memory that has been freed is subsequently accessed, leading to undefined behavior. In the context of ANGLE, this can result in heap corruption that an attacker can potentially leverage for arbitrary code execution.

The vulnerability requires user interaction, specifically that a victim must navigate to a malicious web page containing specially crafted HTML content. Once triggered, the attacker can manipulate the freed memory region to gain control of program execution flow.

ANGLE's role in translating graphics calls makes it a high-value target, as it processes complex rendering operations that can be triggered through WebGL or other graphics-related web APIs. The heap corruption potential indicates that an attacker could overwrite critical data structures or function pointers after the premature free operation.

Root Cause

The root cause of CVE-2023-1531 is improper memory lifecycle management within the ANGLE graphics engine (CWE-416: Use After Free). A memory object is deallocated prematurely while references to that memory still exist elsewhere in the codebase. When these dangling references are subsequently accessed, they operate on freed memory that may have been reallocated for other purposes or corrupted by the attacker.

This class of vulnerability typically occurs due to complex object ownership semantics, asynchronous operations, or error handling paths that fail to account for all references to a memory object before deallocation.

Attack Vector

The attack vector for this vulnerability is network-based and requires user interaction. An attacker must craft a malicious HTML page that triggers the vulnerable code path in ANGLE. The attack scenario involves:

1. Attacker hosts a malicious webpage containing specially crafted graphics rendering code
2. Victim navigates to the malicious page through social engineering or other means
3. The page triggers the ANGLE vulnerability through WebGL or similar graphics operations
4. The Use After Free condition corrupts heap memory
5. Attacker potentially achieves code execution within the Chrome renderer process

The vulnerability does not require any privileges on the target system, making it accessible to any attacker who can convince a user to visit a malicious website.

Detection Methods for CVE-2023-1531

Indicators of Compromise

• Unexpected Chrome renderer process crashes with heap corruption signatures
• Browser crash reports indicating ANGLE component failures
• Network traffic to suspicious domains serving potentially malicious WebGL content
• Memory corruption artifacts in Chrome crash dumps referencing graphics subsystems

Detection Strategies

• Monitor for Chrome crash reports with stack traces involving ANGLE or graphics rendering components
• Implement network monitoring for connections to known malicious infrastructure serving browser exploits
• Deploy endpoint detection solutions capable of identifying heap spray patterns and memory corruption attempts
• Utilize browser telemetry to identify anomalous WebGL rendering patterns

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and analyze reports for ANGLE-related issues
• Monitor endpoint security solutions for browser exploitation attempts
• Track browser version compliance across the organization to identify unpatched instances
• Review network security logs for patterns consistent with drive-by download attempts

How to Mitigate CVE-2023-1531

Immediate Actions Required

• Update Google Chrome to version 111.0.5563.110 or later immediately
• Enable automatic updates for Chrome to ensure timely security patches
• Update Chromium-based browsers and applications to their latest patched versions
• Consider temporary restrictions on WebGL usage in high-security environments until patching is complete

Patch Information

Google has released Chrome version 111.0.5563.110 which addresses this vulnerability. The patch was announced in the Google Chrome Stable Channel Update for Desktop on March 21, 2023. Additional technical details are available in Chrome Bug Report #1415330.

For Fedora users, security updates have been distributed through the Fedora package management system. Gentoo users should refer to GLSA 202309-17 for patching guidance.

Organizations using Chromium-based browsers or embedding Chromium should ensure they update to patched versions that incorporate the fix for this vulnerability.

Workarounds

• Disable WebGL in Chrome by launching with the --disable-webgl flag as a temporary measure
• Implement network-level blocking for known malicious domains
• Use browser isolation solutions to contain potential exploitation attempts
• Consider enterprise browser policies that restrict access to untrusted web content

# Configuration example
# Disable WebGL temporarily by launching Chrome with this flag
google-chrome --disable-webgl

# For enterprise deployments, consider setting Chrome policies
# Create /etc/opt/chrome/policies/managed/disable_webgl.json
cat << EOF > /etc/opt/chrome/policies/managed/disable_webgl.json
{
  "WebGLEnabled": false
}
EOF