CVE–: Critical Sandbox Escape in Google Chrome (Mojo Component)

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A high-severity zero-day vulnerability has been discovered in Google Chrome’s Mojo IPC component, allowing remote attackers to escape the browser sandbox on Windows systems. This flaw was exploited in-the-wild believed to be part of a cyber-espionage campaign, making rapid detection and mitigation essential.

You Should Know:

Detection and Verification:

1. Check Chrome Version:

 Windows Command:
reg query "HKEY_CURRENT_USER\Software\Google\Chrome\BLBeacon" /v version
 Linux/macOS alternative if Chrome installed via package manager:
google-chrome --version || chromium --version

2. Verify Patch Status:

 PowerShell script to verify Chrome version >= 134.0.6998.177
$chromeVersion = (Get-ItemProperty 'HKCU:\Software\Google\Chrome\BLBeacon').version
[version]$minVersion = "134.0.6998.177"
if ([version]$chromeVersion -ge $minVersion) {
Write-Host "Chrome is patched" -ForegroundColor Green
} else {
Write-Host "VULNERABLE - Update Chrome immediately!" -ForegroundColor Red
}

Mitigation Commands:

1. Windows Firewall Restriction:

 Block Chrome outbound network access temporarily:
New-NetFirewallRule -DisplayName "Block Chrome Outbound" -Direction Outbound -Program "$env:PROGRAMFILES\Google\Chrome\Application\chrome.exe" -Action Block

2. Linux Alternative (iptables):

 Block Chrome network access on Linux:
sudo iptables -A OUTPUT -p tcp -m owner --uid-owner $(id -u $(whoami)) -m comm --comm "chrome" -j DROP

3. Enterprise Deployment Script (using Chocolatey):

 Force update Chrome across all enterprise systems:
choco upgrade googlechrome -y --force

Memory Analysis (Post-Exploit):

 Volatility memory analysis for Chrome processes (Linux):
vol.py -f memory.dump --profile=Win10x64_19041 chromehistory
vol.py -f memory.dump --profile=Win10x64_19041 chromesandbox

What Undercode Say:

This critical sandbox escape vulnerability demonstrates the ongoing arms race in browser security. The Mojo IPC component has been a recurring target for attackers due to its complexity and privileged access. Beyond the immediate patching requirements, security teams should:

  1. Implement application allowlisting to prevent unauthorized binaries from executing post-exploit
  2. Monitor for unusual Chrome child processes using these commands: 
    Linux:
ps aux | grep -i chrome | grep -v grep
Windows:
Get-WmiObject Win32_Process | Where-Object {$_.Name -like "chrome"} | Select-Object ProcessId,Name,CommandLine

3. Consider additional hardening measures:

 Linux seccomp-bpf filters for Chrome:
sudo sysctl -w kernel.unprivileged_userns_clone=0
 Windows exploit protection:
Set-ProcessMitigation -PolicyFilePath Chrome_Protections.xml

4. Enable detailed Chrome logging for forensic analysis:

google-chrome --enable-logging --v=1 --vmodule=/mojo/=2

The provided detection and remediation scripts from Vicarius should be incorporated into enterprise monitoring systems immediately. This vulnerability is particularly dangerous as it bypasses Chrome’s multi-layered sandbox protections, which have been a cornerstone of its security model.

Expected Output:

  • Chrome version check output showing patched version
  • Successful firewall rule creation confirmation
  • Memory analysis showing no suspicious Chrome child processes
  • Enterprise deployment confirmation logs

Reference URLs:

  • Detection script: https://lnkd.in/dFcV75tA
  • Remediation script: https://lnkd.in/d_wgYPrB

References:

Reported By: Roicohen Cve – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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