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Pentest
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Last edited time
May 29, 2024 1:59 PM
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👉 Overview
👀 What ?
Pentesting VNC (Virtual Network Computing) refers to the practice of testing the security of VNC services on ports 5800, 5801, 5900, and 5901. VNC is a graphical desktop sharing system that allows remote control of another computer. Ports 5800 and 5801 are often used for browser-based VNC access, while 5900 and 5901 are used for the actual VNC service.
🧐 Why ?
Pentesting VNC is essential because VNC services, if not properly secured, can allow unauthorized users to gain control of a system. VNC is often used in corporate environments, making it a prime target for attackers. Understanding how to test these services and patch any vulnerabilities is critical for maintaining a secure network.
⛏️ How ?
Pentesting VNC involves several steps. First, identify the VNC services running on your network, often using a tool like Nmap. Next, attempt to connect to the VNC service using a VNC client. If a password is required, try common default passwords or use a tool like Hydra to attempt to crack the password. If you gain access, assess the level of control you have over the system. Finally, document your findings and work on patching any vulnerabilities found.
⏳ When ?
Pentesting VNC should be conducted regularly, especially after any changes to network infrastructure or VNC configurations. It is also recommended to perform ad-hoc tests in response to new vulnerabilities identified in VNC software.
⚙️ Technical Explanations
VNC operates by transmitting keyboard and mouse events from the 'viewer' or client to the 'server' or host, and relaying screen updates back to the client. This interaction is performed over specific ports, typically 5800/5801 for web access, and 5900/5901 for the actual VNC service. These ports, if left open and unsecured, can be exploited by attackers to gain unauthorized access to a system. Therefore, pentesting these services involves testing for common vulnerabilities, such as weak or default passwords, unpatched software, or misconfigured access controls. Tools like Nmap, Hydra, and Metasploit can be used to identify and exploit these vulnerabilities.