Common SCADA vulnerabilities in SCADA systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the most common vulnerability in SCADA systems

Which of the following is the most common vulnerability found in SCADA systems that can lead to unauthorized access?

A Strict network segmentation

B Excessive encryption of communication channels

C Overuse of multi-factor authentication

D Use of default or weak passwords on devices

💡 Hint

Think about what attackers often exploit first when targeting SCADA devices.

Many SCADA systems use default or weak passwords, making them vulnerable to unauthorized access. Strong passwords and credential management are critical.

💻 Command Output

intermediate

Output of a network scan on a SCADA device

You run a network scan on a SCADA device using the command nmap -sV 192.168.1.100. Which output indicates a vulnerable service running?

SCADA systems

Starting Nmap 7.80 ( https://nmap.org ) at 2024-06-01 10:00
Nmap scan report for 192.168.1.100
Host is up (0.0010s latency).
Not shown: 997 closed ports
PORT     STATE SERVICE VERSION
502/tcp  open  modbus  Modbus protocol
80/tcp   open  http    Apache httpd 2.2.15
23/tcp   open  telnet  Linux telnetd

Service Info: OS: Linux

A Telnet service running on port 23

B Modbus protocol running on port 502

C Apache httpd 2.2.15 running on port 80

D All services are secure and up to date

💡 Hint

Consider which service is known for transmitting data without encryption.

Telnet transmits data in plain text and is considered insecure. Its presence on SCADA devices is a vulnerability.

❓ Troubleshoot

advanced

Troubleshoot SCADA system communication failure

A SCADA system suddenly stops communicating with remote RTUs (Remote Terminal Units). Which configuration issue is the most likely cause?

A RTUs configured with static IP addresses

B Firewall blocking Modbus TCP port 502

C Use of encrypted VPN tunnels between SCADA and RTUs

D RTUs running latest firmware

💡 Hint

Think about what could block the communication protocol used by SCADA.

If the firewall blocks port 502, which Modbus TCP uses, communication between SCADA and RTUs will fail.

✅ Best Practice

advanced

Best practice to secure SCADA communication

Which of the following is the best practice to secure communication between SCADA control centers and field devices?

A Disable all authentication to speed up communication

B Allow direct internet access to SCADA devices for remote management

C Use VPN tunnels with strong encryption for all SCADA traffic

D Use default passwords to simplify device access

💡 Hint

Think about how to protect data traveling over networks.

Using VPN tunnels with strong encryption protects SCADA communication from interception and tampering.

🔀 Workflow

expert

Order the steps to respond to a SCADA malware infection

Arrange the following steps in the correct order to respond effectively to a malware infection in a SCADA system.

A 1,3,2,4

B 3,1,2,4

C 1,2,3,4

D 3,2,1,4

💡 Hint

Think about immediate containment before analysis and recovery.

First isolate infected devices to stop spread, then notify teams, analyze malware, and finally restore from backups.