What are the main risks of using Telnet over public networks? (2024)

Key takeaways from this article

• Switch to SSH:

  Secure Shell (SSH) is a more secure alternative to Telnet. It encrypts your data, making it nearly impossible for attackers to intercept. Plus, it offers features like file transfers and session management that Telnet doesn't.

• Zero Trust approach:

  This security model doesn't assume trust within or outside the network. It verifies every access request meticulously, greatly reducing the risk posed by outdated or compromised tech.

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• Iain White Tech Consultant | IT Leader | Mentor |…
• Srehari Saravanan Passionate about Building Secure and…

• Iain White Tech Consultant | IT Leader | Mentor | Virtual CTO | Leadership Coach | Project Manager | Scrum Master | IT Strategy | Digital Transformation | IT Governance | Agile | Lean | Theory Of Constraints | SaaS | Brisbane 🇦🇺.

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  Using Telnet over public networks exposes significant security risks due to its lack of encryption. Any data transmitted, including sensitive credentials, can be intercepted easily. This vulnerability can lead to severe consequences such as data breaches and system intrusions. From my experience, transitioning to more secure protocols like SSH, which encrypts all transmitted data, is essential for safeguarding information. This shift not only enhances security but also aligns with best practices for maintaining the integrity and confidentiality of communications in today's digital landscape.

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  See Also

  Introduction to TELNET - GeeksforGeeksTelnet Explained: What Is It and How It Works? - ClouDNS BlogTesting port connectivity with TelnetHow to Use the Telnet Client in Windows
• Srehari Saravanan Passionate about Building Secure and Scalable Solutions | Network Engineering | Cloud Security | High Performance Computing (HPC) Networks | Data Center Infrastructure

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  Telnet does not provide any encryption of the data transmitted over the network. This means that any information including passwords and commands sent over Telnet can be intercepted using packet sniffing tools. Intercepted data can be altered by attackers before forwarding it to the intended recipient. This can lead to unauthorized modifications, data corruption, or the injection of malicious code or commands. Attackers can also capture the unencrypted data and later replay it to achieve unauthorized actions or access. This can be an issue particularly if the unencrypted data includes authentication tokens or session identifiers.

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• Srehari Saravanan Passionate about Building Secure and Scalable Solutions | Network Engineering | Cloud Security | High Performance Computing (HPC) Networks | Data Center Infrastructure

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  Attackers can exploit by systematically guessing passwords or using automated tools to perform brute force attacks. If authentication credentials are compromised through methods like phishing, social engineering, or data breaches makes it easier for attackers to use these credentials to gain unauthorized access. Another possible scenario is where users reuse passwords across multiple accounts. If one account with weak authentication is compromised, attackers may attempt to use the same credentials to access other accounts, potentially increasing the scope of the security breach. In addition to brute force attacks, attackers may use dictionary attacks, where they try a previously leaked password against a system with weak authentication.

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• Srehari Saravanan Passionate about Building Secure and Scalable Solutions | Network Engineering | Cloud Security | High Performance Computing (HPC) Networks | Data Center Infrastructure

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  1. Implement Strong Security Measures. Use strong encryption protocols such as TLS for web traffic and SSH for remote access to protect data in transit and at rest. 2. Implement MFA (Multi-Factor Authentication) and strong password policies to secure access to systems and services. 3. Use network segmentation and firewall rules to control traffic flow and limit the impact of potential breaches. 4. Enforcing complex password requirements: Enforcing password policies that require a combination of letters, numbers, and special characters, and discouraging easily guessable passwords. 5. Secure Token based Authentication: Use secure authentication tokens or session identifiers that are resistant to interception or tampering.

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• Srehari Saravanan Passionate about Building Secure and Scalable Solutions | Network Engineering | Cloud Security | High Performance Computing (HPC) Networks | Data Center Infrastructure

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  Implementing a Zero Trust approach where access to resources is based on strict verification regardless of the user’s location within or outside the network perimeter. This minimizes the impact of compromised or incompatible technologies by reducing the trust assumption. Also implementing EDR (Endpoint Detection and Response) solutions to monitor endpoint devices for suspicious activities, malware, and unauthorized access attempts. EDR tools provide real-time visibility and allow for rapid response to incidents. Finally, utilize SDN solutions to centrally manage and configure network infrastructure, enabling dynamic security policies and segmentation. SDN facilitates quicker response to security events and enhances scalability.

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