CVE-2023-3422: Google Chrome Use After Free Vulnerability

CVE-2023-3422 Overview

CVE-2023-3422 is a use-after-free vulnerability [CWE-416] in the Guest View component of Google Chrome prior to version 114.0.5735.198. An attacker who convinces a user to install a malicious extension can trigger heap corruption through a crafted HTML page. Successful exploitation can lead to arbitrary code execution within the browser process context. The flaw affects Google Chrome on all supported desktop platforms and downstream distributions including Debian Linux 11 and 12. Google released a fix in the Stable channel update on June 26, 2023.

Critical Impact
Exploitation can result in heap corruption and potential remote code execution in the Chrome renderer, compromising browser session integrity and confidentiality.

Affected Products

Google Chrome versions prior to 114.0.5735.198
Debian Linux 11 (bullseye)
Debian Linux 12 (bookworm)

Discovery Timeline

2023-06-26 - Google releases Stable Channel update for desktop addressing the issue
2023-06-26 - CVE-2023-3422 published to NVD
2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-3422

Vulnerability Analysis

The vulnerability resides in Chrome's Guest View implementation, which manages embedded web content such as <webview> elements used by extensions and apps. Guest View handles the lifecycle of guest WebContents instances embedded inside an owner document. A use-after-free condition arises when memory associated with a guest view is freed while a reference to that object remains reachable from other code paths. Subsequent access dereferences the dangling pointer, leading to heap corruption.

An attacker exploiting this flaw can influence the contents of the freed heap region by spraying it with attacker-controlled objects before the dangling reference is dereferenced. This primitive can be chained with additional techniques to achieve arbitrary read/write or code execution within the renderer process.

Root Cause

The root cause is improper object lifetime management in the Guest View component, classified as [CWE-416] Use After Free. Reference counting or ownership semantics in the affected code path fail to account for all paths that retain access to the guest view object, allowing access after deallocation.

Attack Vector

Exploitation requires the victim to install a malicious browser extension and then load a crafted HTML page. The user interaction requirement (UI:R) reduces opportunistic exploitation but does not eliminate risk in scenarios involving sideloaded extensions, supply chain compromise of legitimate extensions, or social engineering. Network delivery of the trigger page is straightforward once the malicious extension is installed.

No verified public proof-of-concept exploit code is available. Technical details on the underlying defect are tracked in the Chromium Bug Report.

Detection Methods for CVE-2023-3422

Indicators of Compromise

Chrome renderer process crashes with heap corruption signatures originating from Guest View or WebViewGuest code paths
Installation of unverified or sideloaded Chrome extensions from outside the Chrome Web Store
Unexpected child processes spawned by chrome.exe or browser binary following extension installation
Outbound network connections from the browser process to attacker-controlled infrastructure after loading specific HTML pages

Detection Strategies

Inventory installed Chrome extensions across the fleet and flag extensions sourced from non-standard channels
Monitor browser version telemetry to identify endpoints running Chrome versions below 114.0.5735.198
Correlate browser crash dumps with subsequent process anomalies to detect post-exploitation activity
Apply enterprise policy controls such as ExtensionInstallAllowlist and ExtensionInstallBlocklist and alert on policy violations

Monitoring Recommendations

Collect endpoint telemetry on Chrome process lineage, child process creation, and unusual memory allocation patterns
Track extension installation events through Chrome enterprise reporting and forward to a centralized log platform
Audit user-agent strings and Chrome version reporting at web proxies to identify unpatched clients

How to Mitigate CVE-2023-3422

Immediate Actions Required

Update Google Chrome to version 114.0.5735.198 or later on all desktop endpoints
Apply Debian security update DSA-5440 for Debian 11 and 12 systems running affected Chromium packages
Audit installed browser extensions and remove any that are unverified, unused, or sourced outside the Chrome Web Store
Enforce extension allowlisting via enterprise group policy to prevent installation of arbitrary extensions

Patch Information

Google addressed the issue in the Stable Channel update for desktop released on June 26, 2023, shipping Chrome 114.0.5735.198 and 114.0.5735.199 for Windows and 114.0.5735.198 for Mac and Linux. Downstream fixes are available through the Debian Security Advisory DSA-5440, Fedora package announcements, and Gentoo GLSA 202401-34. Full vendor details are published in the Chrome Releases blog post.

Workarounds

Restrict extension installation through enterprise policy until patching is complete
Disable Developer Mode in Chrome to prevent sideloading of unpacked extensions
Educate users to avoid installing extensions from untrusted sources and unfamiliar HTML attachments

bash

# Example Chrome enterprise policy fragment restricting extensions
# Linux: /etc/opt/chrome/policies/managed/extensions.json
{
  "ExtensionInstallBlocklist": ["*"],
  "ExtensionInstallAllowlist": [
    "<approved-extension-id-1>",
    "<approved-extension-id-2>"
  ],
  "DeveloperToolsAvailability": 2
}