CVE-2023-3728 Overview
CVE-2023-3728 is a Use After Free vulnerability in the WebRTC component of Google Chrome prior to version 115.0.5790.98. This memory corruption flaw allows a remote attacker to potentially exploit heap corruption via a crafted HTML page, enabling arbitrary code execution within the context of the browser process.
Critical Impact
Remote attackers can exploit this Use After Free vulnerability to achieve heap corruption and potentially execute arbitrary code by luring victims to visit malicious web pages. This requires no special privileges and only minimal user interaction.
Affected Products
- Google Chrome versions prior to 115.0.5790.98
- Chromium-based browsers utilizing the vulnerable WebRTC component
- Linux distributions with bundled Chrome packages (Fedora, Gentoo)
Discovery Timeline
- August 1, 2023 - CVE-2023-3728 published to NVD
- November 21, 2024 - Last updated in NVD database
Technical Details for CVE-2023-3728
Vulnerability Analysis
This vulnerability exists within Google Chrome's WebRTC (Web Real-Time Communication) implementation, a component responsible for enabling real-time audio, video, and data communication directly between browsers. The Use After Free condition occurs when the WebRTC subsystem continues to reference memory that has already been deallocated, creating an opportunity for heap corruption.
When exploited, this flaw allows attackers to manipulate freed memory regions, potentially overwriting critical data structures or function pointers. The vulnerability is classified under CWE-416 (Use After Free), a class of memory safety issues that frequently leads to code execution in browser environments.
The attack requires no authentication or prior access to the target system—an attacker simply needs to convince a user to navigate to a malicious webpage containing specially crafted HTML and JavaScript that triggers the vulnerable code path in WebRTC.
Root Cause
The root cause of CVE-2023-3728 is improper memory management within Chrome's WebRTC implementation. Specifically, the code fails to properly track object lifetimes, leading to a scenario where a reference to a memory object persists after that object has been freed. When this dangling reference is subsequently accessed, the application operates on invalid memory, resulting in undefined behavior that attackers can leverage for exploitation.
Use After Free vulnerabilities typically arise from race conditions in object destruction, incorrect reference counting, or failure to nullify pointers after deallocation. In the context of WebRTC, the complex asynchronous nature of real-time communication handling creates numerous opportunities for such memory management errors.
Attack Vector
The attack is delivered via network (remote) through a crafted HTML page. The exploitation flow typically involves:
- An attacker hosts a malicious webpage containing JavaScript that interacts with the WebRTC API in a specific sequence
- The victim is lured to visit this page through phishing, malvertising, or other social engineering techniques
- The malicious JavaScript triggers the vulnerable code path, causing the Use After Free condition
- The attacker's payload manipulates the freed memory to achieve heap corruption
- Successful exploitation can lead to arbitrary code execution within the Chrome renderer process
The vulnerability requires user interaction (visiting a malicious page) but does not require any privileges on the target system, making it a viable attack vector for widespread exploitation campaigns.
Detection Methods for CVE-2023-3728
Indicators of Compromise
- Unexpected Chrome crashes or renderer process terminations when visiting unfamiliar websites
- Chrome crash reports mentioning WebRTC-related modules or heap corruption
- Network connections to suspicious domains serving malicious HTML/JavaScript payloads
- Anomalous WebRTC API usage patterns in browser debugging logs
Detection Strategies
- Monitor for Chrome versions below 115.0.5790.98 across managed endpoints using software inventory tools
- Implement browser-level telemetry to detect abnormal WebRTC API call sequences
- Deploy web content filtering to block known malicious domains attempting to exploit browser vulnerabilities
- Enable crash dump collection and analysis for Chrome to identify potential exploitation attempts
Monitoring Recommendations
- Review Chrome update status across the enterprise environment regularly
- Monitor endpoint detection and response (EDR) solutions for Chrome process anomalies
- Track security advisories from Google Chrome Stable Updates for related patches
- Analyze network traffic for suspicious HTML/JavaScript delivery targeting browser vulnerabilities
How to Mitigate CVE-2023-3728
Immediate Actions Required
- Update Google Chrome to version 115.0.5790.98 or later immediately across all systems
- Enable automatic updates for Chrome to ensure future security patches are applied promptly
- Educate users about the risks of visiting untrusted websites and clicking on suspicious links
- Review and update web content filtering policies to block known exploit delivery domains
Patch Information
Google has addressed this vulnerability in Chrome version 115.0.5790.98, released as part of the Stable Channel Update for Desktop. Organizations should prioritize deployment of this update across all managed Chrome installations.
For Linux distributions, relevant security updates have been released:
Additional technical details are tracked in Chromium Bug Report #1457421.
Workarounds
- If immediate patching is not possible, consider temporarily disabling WebRTC functionality using browser extensions or group policy settings
- Implement network-level controls to filter potentially malicious web content
- Use browser isolation technologies to contain potential browser exploitation
- Restrict access to untrusted websites through URL filtering and security gateways
# Verify Chrome version on Linux systems
google-chrome --version
# Expected output: Google Chrome 115.0.5790.98 or higher
# For enterprise deployment, use Chrome policies to enforce updates
# Add to managed policies JSON:
# "RelaunchNotification": 2,
# "RelaunchNotificationPeriod": 86400000
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
