Open Port 53 (DNS)

Potential Misconfiguration: Open DNS service exposed to the internet.

Impact: DNS amplification attacks could be conducted against this server.

Action:

Open Ports: 135, 139, 445 (MSRPC & NetBIOS)

Vulnerability: Potential exposure to SMB-related vulnerabilities.

Impact: Attackers could exploit SMB vulnerabilities to gain access or execute malicious code.

Action:

Finding 1: Open Ports with Indeterminate Services

What it is: Ports 49152 and 62078 are open, categorized under "tcpwrapped", indicating some kind of service is running, but not explicitly identified.

Why it matters: Open ports can expose network services to potential attacks. If these services are misconfigured or vulnerable, they can be exploited, leading to unauthorized access or data breaches.

How it could be exploited: An attacker could attempt to connect to these ports to determine if any services are running behind them and could exploit potential vulnerabilities in those services once identified.

Action:

Mitigation Step:

If the services are unrecognized or unnecessary, consider closing the ports using a firewall rule:

Linux Example:

Windows Example:

Verify the rules using:

Finding 2: Filtered Port

What it is: Port 49591 is filtered, meaning that there’s a firewall or a filtering device that is blocking access to this port.

Why it matters: Unjustified filtering can represent a configuration that either hides necessary services or is indicative of a misconfigured firewall. If legitimate services aren't accessible, it may halt operations.

How it could be exploited: Attackers may probe this port to find misconfigurations. Prolonged filtering can also signal to attackers that there might be valuable services that could lead to unauthorized data access.

Action:

Mitigation Step:

Review your firewall rules to ensure that filtered ports are intentional and necessary:

Linux Example:

Windows Example:

Monitor the service behavior: