A new critical vulnerability, CVE-2024-49115, has been discovered in Windows Remote Desktop Services, putting countless systems at risk. If exploited, this flaw could allow attackers to execute malicious code remotely, potentially compromising sensitive data and disrupting your operations. Here’s what you need to know about this vulnerability and how to protect your systems effectively.

What Is CVE-2024-49115?

CVE-2024-49115 is a remote code execution (RCE) vulnerability found in the Remote Desktop Protocol (RDP) used by Windows systems. This vulnerability can be exploited by unauthenticated attackers who craft specially designed requests to exploit the flaw in unpatched RDP servers. Once successful, they can execute arbitrary code, effectively taking control of the target system.

Why Is This Vulnerability Dangerous?

1. Remote Exploitation: Attackers do not need physical access to your system; exploitation can occur over the network.
2. Unauthenticated Access: No user credentials are required to exploit this vulnerability, making it easier for attackers to target vulnerable systems.
3. Potential for Automation: Exploits for RCE vulnerabilities like this can be automated, enabling attackers to launch widespread attacks.

How to Protect Your System

To secure your system from CVE-2024-49115, follow these steps:

Step 1: Apply Security Patches

Microsoft has released a patch addressing this vulnerability. Update your systems immediately by:

1. Navigating to Settings > Update & Security > Windows Update.
2. Clicking Check for Updates.
3. Installing all available updates.

Ensure all systems running Windows, including servers and endpoints with RDP enabled, are updated.

Step 2: Enable Network Level Authentication (NLA)

Enabling NLA adds a layer of protection by requiring authentication before an RDP session is established:

1. Open the System Properties dialog (type sysdm.cpl in the Run dialog).
2. Navigate to the Remote tab.
3. Under Remote Desktop, check the box for “Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended).”
4. Click OK to save changes.

Step 3: Limit RDP Access

Restrict RDP access to only trusted networks and users:

• Use a firewall to block RDP access from untrusted IP addresses.
• Disable RDP if it’s not essential for your operations.
• Implement a Virtual Private Network (VPN) to secure RDP connections.

Step 4: Use Strong Passwords and Multi-Factor Authentication (MFA)

If RDP is necessary for your operations, secure all accounts with:

• Strong, unique passwords.
• Multi-factor authentication (MFA) to reduce the risk of unauthorized access.

Step 5: Monitor and Audit RDP Activity

Regularly monitor your system’s RDP usage and audit logs for:

• Unusual login attempts.
• Suspicious IP addresses or connection patterns.