CVE-2024-8198: Google Chrome Buffer Overflow Vulnerability

CVE-2024-8198 Overview

CVE-2024-8198 is a heap buffer overflow vulnerability affecting the Skia graphics library in Google Chrome prior to version 128.0.6613.113. This memory corruption flaw enables a remote attacker who has already compromised the renderer process to potentially exploit heap corruption through a specially crafted HTML page. The vulnerability affects the browser's core graphics rendering engine, making it a significant security concern for Chrome users.

Critical Impact

Successful exploitation of this heap buffer overflow could allow attackers to achieve arbitrary code execution, potentially leading to complete system compromise through a crafted web page after initial renderer process compromise.

Affected Products

• Google Chrome versions prior to 128.0.6613.113
• All platforms running vulnerable Chrome versions (Windows, macOS, Linux)
• Chromium-based browsers using affected Skia library versions

Discovery Timeline

• August 28, 2024 - CVE-2024-8198 published to NVD
• October 15, 2024 - Last updated in NVD database

Technical Details for CVE-2024-8198

Vulnerability Analysis

This vulnerability exists within Skia, Google Chrome's 2D graphics library responsible for rendering graphics, text, and images. The heap buffer overflow occurs when the Skia library improperly handles memory allocation during graphics processing operations. An attacker who has already gained control of the renderer process can leverage this flaw to corrupt heap memory structures, potentially leading to arbitrary code execution or further system compromise.

The vulnerability is classified under multiple CWE identifiers: CWE-122 (Heap-based Buffer Overflow), CWE-787 (Out-of-bounds Write), and CWE-120 (Buffer Copy without Checking Size of Input). This classification indicates that the core issue involves writing data beyond the allocated buffer boundaries in heap memory without proper bounds checking.

Root Cause

The root cause stems from insufficient boundary validation in the Skia graphics library when processing certain graphical elements. When handling specially crafted HTML content, the library fails to properly validate the size of input data before copying it into a heap-allocated buffer. This oversight allows more data to be written than the buffer can accommodate, resulting in heap corruption that can be exploited for malicious purposes.

Attack Vector

The attack requires a multi-stage exploitation approach. First, an attacker must compromise the Chrome renderer process through a separate vulnerability or attack vector. Once the renderer process is under attacker control, the heap buffer overflow in Skia can be triggered by loading a maliciously crafted HTML page. The crafted page would contain graphics elements designed to trigger the overflow condition in Skia's processing routines.

The network-based attack vector means users can be targeted by simply visiting a malicious website or viewing compromised content online. While user interaction (visiting the malicious page) is required, no special privileges are needed, and the attack does not require authentication.

The vulnerability mechanism involves crafting specific HTML/CSS elements that trigger improper memory handling in Skia's graphics processing pipeline. Technical details can be found in the Chromium Issue Tracker Entry once the security embargo period has ended.

Detection Methods for CVE-2024-8198

Indicators of Compromise

• Unexpected Chrome crashes or renderer process terminations during web browsing
• Abnormal memory consumption patterns in Chrome processes
• Detection of exploit code attempting to trigger Skia-related heap operations
• Suspicious network traffic to known malicious domains serving crafted HTML content

Detection Strategies

• Monitor Chrome browser version inventory across enterprise endpoints to identify unpatched installations
• Deploy endpoint detection rules targeting heap overflow exploitation patterns in browser processes
• Implement web content inspection for malformed graphics elements that may trigger the vulnerability
• Configure browser telemetry to alert on unusual Skia library behavior or crashes

Monitoring Recommendations

• Enable Chrome crash reporting and analyze crash dumps for heap corruption signatures
• Monitor for renderer process compromise indicators that may precede exploitation attempts
• Track browser update compliance across the organization to ensure timely patching
• Implement network-level detection for known exploit delivery infrastructure

How to Mitigate CVE-2024-8198

Immediate Actions Required

• Update Google Chrome to version 128.0.6613.113 or later immediately on all systems
• Enable automatic updates for Chrome browsers to ensure future security patches are applied promptly
• Review endpoint protection solutions to ensure they can detect heap overflow exploitation attempts
• Consider implementing browser isolation technologies for high-risk users until patching is complete

Patch Information

Google has addressed this vulnerability in Chrome version 128.0.6613.113, released as part of a stable channel update. Organizations should prioritize updating to this version or later. The official security advisory is available at the Chrome Desktop Update page. Enterprise administrators can use Chrome's group policy settings or enterprise management tools to enforce the update across managed devices.

Workarounds

• Implement web content filtering to block access to untrusted or suspicious websites until patching is complete
• Enable Chrome's Site Isolation feature to provide additional sandboxing between renderer processes
• Consider using browser extensions that limit JavaScript execution on untrusted sites
• Deploy network-based web application firewalls capable of inspecting HTML content for malicious patterns

# Verify Chrome version on Linux/macOS
google-chrome --version
# Expected output should be 128.0.6613.113 or higher

# Force Chrome update check (Windows - run as administrator)
# Navigate to chrome://settings/help to trigger update check
# Or use enterprise deployment tools like SCCM/Intune for managed updates