Answer
Information systems are vulnerable to technical, organizational, and environmental threats from internal and external sources. The weakest link in the chain is poor system management. If managers at all levels don’t make security and reliability their number one priority, then the threats to an information system can easily become real. The figure below gives some of the threats to each component of a typical network.
Common threats against contemporary information system are
• Errors and Omissions
• Fraud and Theft
• Employee Sabotage
• Loss of Physical and Infrastructure Support
• Malicious Hackers
• Industrial Espionage
• Malicious Code
• Malicious Software
o Virus
o Worms
o Trojan horse
• Threats to Personal Privacy