Microsoft April Patch Tuesday: Vulnerabilities, Actively Exploited Zero-Day!

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Microsoft has released the April 2025 Patch Tuesday update, addressing 134 vulnerabilities, including one actively exploited zero-day. Among them, 11 vulnerabilities are rated as “Critical”, all of which are Remote Code Execution (RCE) — extremely dangerous if exploited.

Vulnerability breakdown:

  • 49 Elevation of Privilege
  • 9 Security Feature Bypass
  • 31 Remote Code Execution
  • 17 Information Disclosure
  • 14 Denial of Service
  • 3 Spoofing

System administrators are urged to promptly review, assess risks, and apply the patches — especially for Internet-facing services, Domain Controllers, critical infrastructure, and high-privilege user machines.

Read more:

https://lnkd.in/gj5FcEZN

You Should Know: Critical Patch Management Commands and Steps

Windows Patch Management:

1. Check for updates manually:

Get-WindowsUpdate

2. Install all available updates:

Install-WindowsUpdate -AcceptAll -AutoReboot

3. List installed updates (PowerShell):

Get-Hotfix | Sort-Object -Property InstalledOn -Descending

4. Verify specific KB patches:

Get-WindowsUpdate -KBArticleID "KB5035845"

5. Force update via command line (legacy):

wuauclt.exe /updatenow

Linux Security Patching:

1. Update all packages (Debian/Ubuntu):

sudo apt update && sudo apt upgrade -y

2. Check for security-only updates (RHEL/CentOS):

sudo yum update --security

3. List available updates:

sudo apt list --upgradable

4. Automate patching with cron:

0 3    root apt update && apt upgrade -y

Zero-Day Mitigation Checks:

1. Verify system exposure (Windows):

Get-CimInstance -ClassName Win32_Product | Where-Object {$_.Name -like "VulnerableSoftware"}

2. Check running services for exploits:

netstat -tulnp | grep suspicious_port

3. Audit Linux privilege escalation paths:

sudo find / -perm -4000 -type f -exec ls -la {} \;

4. Windows Event Log analysis for exploitation attempts:

Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4688} | Where-Object {$_.Message -like "powershell"}

What Undercode Say:

The April 2025 Patch Tuesday underscores the critical need for proactive vulnerability management. With RCE vulnerabilities dominating the update, organizations must prioritize:

  1. Immediate patching of internet-facing systems using automated deployment tools like WSUS or Ansible:
    ansible all -m win_updates -a "category_names=Security"
    

  2. Zero-day mitigation through temporary workarounds if patches cannot be immediately applied:

    Set-NetFirewallRule -DisplayName "Block Exploit Port" -Enabled True
    

3. Enhanced logging to detect exploitation attempts:

auditctl -a always,exit -F arch=b64 -S execve -k critical_exec

4. Windows Defender exploit protection configuration:

Set-ProcessMitigation -System -Enable ExportAddressFilterPlus, ImportAddressFilter

5. Linux kernel hardening for unpatched systems:

echo "kernel.exec-shield=1" >> /etc/sysctl.conf

Remember that delaying patches for critical RCE vulnerabilities is equivalent to leaving your doors unlocked in a high-crime area. Implement a robust patch management lifecycle and verify deployments with:

Test-WSUSServerConnection -WsusServerName "your_wsus_server"

Expected Output:

A fully patched and audited environment with verified update deployments across all critical assets, monitored through centralized logging and intrusion detection systems.

References:

Reported By: Phuong Nguyen – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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