CVE-2023-1534: Google Chrome ANGLE RCE Vulnerability

CVE-2023-1534 Overview

CVE-2023-1534 is an out-of-bounds read vulnerability in ANGLE (Almost Native Graphics Layer Engine) in Google Chrome prior to version 111.0.5563.110. This vulnerability allowed a remote attacker who had already compromised the renderer process to potentially exploit heap corruption via a crafted HTML page. Google has classified this as a high severity Chromium security issue.

Critical Impact

Attackers who have compromised the Chrome renderer process can leverage this vulnerability to perform out-of-bounds memory reads and potentially exploit heap corruption, enabling further system compromise through specially crafted HTML pages.

Affected Products

• Google Chrome versions prior to 111.0.5563.110
• Fedora Project Fedora 36
• Fedora Project Fedora 37
• Fedora Project Fedora 38

Discovery Timeline

• 2023-03-21 - CVE-2023-1534 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-1534

Vulnerability Analysis

This vulnerability resides in ANGLE, Google Chrome's cross-platform graphics abstraction layer that translates OpenGL ES API calls to the underlying native graphics API (DirectX, OpenGL, Vulkan, or Metal). The out-of-bounds read condition (CWE-125) occurs during shader processing operations within the ANGLE component.

The vulnerability requires an attacker to first compromise the renderer process, making this a sandbox escape or privilege escalation technique rather than an initial infection vector. Once the renderer is compromised, an attacker can craft malicious WebGL content that triggers the out-of-bounds read, potentially leading to heap corruption that could be exploited for further malicious activities.

The vulnerability is exploitable remotely through the network by luring a victim to visit a malicious webpage containing the crafted HTML content. User interaction is required to visit the malicious page, but no additional privileges are needed beyond standard browser access.

Root Cause

The root cause of CVE-2023-1534 is improper bounds checking in the ANGLE graphics layer when processing shader binary data. Specifically, the vulnerability relates to the SpvGetMappedSamplerName function, which performs an out-of-bounds string copy operation. The ANGLE layer fails to properly validate the boundaries of memory operations during shader compilation and execution, allowing read operations to access memory outside the intended buffer boundaries. This improper input validation enables attackers to potentially read sensitive data from adjacent memory regions or corrupt heap structures.

Attack Vector

The attack vector for CVE-2023-1534 involves multiple stages:

1. Initial Renderer Compromise: The attacker must first compromise the Chrome renderer process through a separate vulnerability or exploit chain
2. Malicious Page Delivery: The attacker hosts or injects a crafted HTML page containing malicious WebGL shader code
3. Victim Navigation: The victim navigates to or is redirected to the malicious page
4. Shader Processing: Chrome's ANGLE component processes the malicious shader code, triggering the out-of-bounds read
5. Heap Corruption: The out-of-bounds read can be leveraged to corrupt heap structures, potentially enabling further exploitation

The vulnerability specifically involves the GL_ShaderBinary function being exposed to untrusted processes and the SpvGetMappedSamplerName function performing out-of-bounds string operations, as documented in the Packet Storm security reports.

Detection Methods for CVE-2023-1534

Indicators of Compromise

• Unusual WebGL shader compilation activities in browser process logs
• Chrome renderer process crashes or anomalous memory access patterns
• Suspicious network connections from browser processes following WebGL-heavy page visits
• Evidence of crafted HTML pages with complex shader code targeting ANGLE

Detection Strategies

• Monitor Chrome browser version across the organization to identify instances running versions prior to 111.0.5563.110
• Implement endpoint detection rules for anomalous ANGLE component behavior and shader processing errors
• Deploy network-based detection for known malicious URLs hosting exploit code
• Enable Chrome crash reporting and analyze crashes related to ANGLE or GPU process components

Monitoring Recommendations

• Configure browser telemetry to report version information and update status to centralized security monitoring
• Implement SentinelOne's behavioral AI to detect post-exploitation activities following renderer compromise
• Monitor for suspicious child process spawning from Chrome renderer processes
• Track WebGL-related error logs and unusual GPU process terminations

How to Mitigate CVE-2023-1534

Immediate Actions Required

• Update Google Chrome to version 111.0.5563.110 or later immediately across all systems
• Enable automatic Chrome updates to ensure timely application of security patches
• For Fedora users, apply the security updates referenced in the Fedora Package Announcements
• Consider temporarily disabling WebGL in Chrome via chrome://flags for high-risk environments until patching is complete

Patch Information

Google has released a security patch addressing CVE-2023-1534 in Chrome version 111.0.5563.110. The fix was announced in the Google Chrome Stable Channel Update for Desktop on March 21, 2023. Fedora has also released updated packages for Fedora 36, 37, and 38 as documented in their security advisories. Gentoo users should refer to GLSA 202309-17 for patch information.

Technical details about the vulnerability can be found in the Chromium Bug Report. Additional exploit analysis is available through the Packet Storm reports for the GL_ShaderBinary exposure and SpvGetMappedSamplerName out-of-bounds copy.

Workarounds

• Disable WebGL functionality in Chrome by navigating to chrome://flags/#disable-webgl and enabling the disable flag
• Implement strict Content Security Policy (CSP) headers to restrict WebGL usage on internal applications
• Use browser isolation solutions to contain potential renderer compromises
• Consider using alternative browsers for high-risk activities until Chrome is updated

# Disable WebGL via Chrome command line flags
google-chrome --disable-webgl

# Verify Chrome version on Linux systems
google-chrome --version

# Force Chrome update check (macOS/Linux)
# Navigate to chrome://settings/help in browser

# Fedora update commands for affected systems
sudo dnf update chromium --refresh