CVE-2022-4178: Google Chrome Use After Free Vulnerability

CVE-2022-4178 Overview

CVE-2022-4178 is a use-after-free vulnerability in the Mojo inter-process communication (IPC) layer of Google Chrome. The flaw affects Chrome versions prior to 108.0.5359.71 and is tracked under [CWE-416]. A remote attacker who has already compromised the renderer process can leverage a crafted HTML page to trigger heap corruption in a higher-privileged Chrome process. Successful exploitation can lead to arbitrary code execution outside the renderer sandbox. Google rated the Chromium security severity as High and addressed the issue in the November 2022 stable channel update.

Critical Impact

An attacker controlling the renderer process can corrupt the heap through Mojo IPC, enabling sandbox escape and code execution at browser-process privileges.

Affected Products

• Google Chrome (Desktop) versions prior to 108.0.5359.71
• Chromium-based browsers built on pre-108 Chromium releases
• Gentoo Linux Chromium packages prior to the fixed ebuilds in GLSA 202305-10 and GLSA 202311-11

Discovery Timeline

• 2022-11-30 - CVE-2022-4178 published to the National Vulnerability Database (NVD)
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-4178

Vulnerability Analysis

The vulnerability resides in Mojo, the message-passing system Chrome uses for IPC between the renderer, browser, GPU, and utility processes. A use-after-free condition occurs when an object is freed while a reference to it remains reachable through a Mojo interface or message pipe. Subsequent operations dereference the dangling pointer, allowing controlled heap memory to be reused. An attacker who has already achieved code execution inside the renderer can craft Mojo messages that drive the freed object back into use. This produces heap corruption that can be shaped into arbitrary read, write, or control-flow primitives in a privileged Chrome process.

Root Cause

The root cause is improper object lifetime management in Mojo bindings, where a callback or pending receiver outlives the object it references. When the underlying object is destroyed, the Mojo endpoint continues to dispatch messages against the freed memory. This pattern is classified under [CWE-416] Use After Free. Public technical details remain limited because Google restricts access to the Chrome bug tracker entry at Chrome Bug Report #1376099 until a majority of users have updated.

Attack Vector

Exploitation requires two stages. First, the attacker must compromise the renderer process, typically by chaining a separate JavaScript engine or DOM vulnerability triggered by a crafted HTML page. Second, the attacker abuses Mojo from the compromised renderer to trigger the use-after-free in a higher-privileged process. The attack is delivered over the network and requires user interaction, such as visiting a malicious page. The vulnerability mechanism is described in prose because no public proof-of-concept exists. Refer to the Google Chrome Update Announcement for vendor commentary.

Detection Methods for CVE-2022-4178

Indicators of Compromise

• Chrome renderer or browser processes terminating with heap corruption crash signatures such as STATUS_HEAP_CORRUPTION or SIGSEGV in Mojo-related stack frames
• Spawning of unexpected child processes from chrome.exe shortly after rendering an untrusted HTML page
• Outbound connections from Chrome processes to attacker-controlled infrastructure following visits to unknown domains

Detection Strategies

• Inventory installed Chrome versions across the fleet and flag any build below 108.0.5359.71 as vulnerable
• Hunt for process tree anomalies where a Chrome renderer process initiates unusual file writes, registry changes, or LOLBin execution
• Correlate browser crash telemetry with subsequent suspicious activity on the same host within a short time window

Monitoring Recommendations

• Enable browser crash reporting and forward telemetry to a centralized SIEM for hunting on Mojo-related faults
• Monitor EDR alerts on injection, token manipulation, or persistence attempts originating from browser child processes
• Track endpoints that disable Chrome auto-update or pin older Chromium versions, which extends exposure to this and similar bugs

How to Mitigate CVE-2022-4178

Immediate Actions Required

• Update Google Chrome to version 108.0.5359.71 or later on Windows, macOS, and Linux endpoints
• Restart Chrome after the update to ensure the patched binaries are loaded into memory
• For managed fleets, push the update through enterprise policy and verify rollout via version telemetry
• Update Chromium-based browsers (Edge, Brave, Opera, Vivaldi) to the corresponding patched releases that include Chromium 108

Patch Information

Google released the fix in the Stable Channel update on November 29, 2022, documented in the Google Chrome Update Announcement. Linux distribution maintainers shipped corresponding updates, including Gentoo advisories GLSA 202305-10 and GLSA 202311-11. The root cause tracking entry is Chrome Bug Report #1376099.

Workarounds

• No vendor-supplied workaround exists; patching is the only supported remediation
• Restrict browsing of untrusted sites and enforce strict site isolation policies until patching is complete
• Deploy enterprise browser policies that block execution of unknown extensions and reduce renderer attack surface

# Verify Chrome version on Linux/macOS endpoints
google-chrome --version

# Force an update check on Linux
sudo apt-get update && sudo apt-get install --only-upgrade google-chrome-stable

# Windows: query installed Chrome version via PowerShell
(Get-Item "$env:ProgramFiles\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion