Risk Rating:


Visibility is the part of security that defines the opportunity. What the attacker sees, knows, or can glean to improve the success of the attack, or even as a reason to put effort into an attack, including how much effort the attack is worth, compromises the effectiveness of security. If the attacker can't see it, he or she has no means or reason for an attack.

The typical Internet-based Linux server is often visible over data networks if it is running services or has been configured to respond to pings. However, some configurations may not be visible if the system is used to shape or route traffic without incrementing packet Time to Live (TTL) values. Linux running a network Intrusion

Detection System (IDS) may also be passively capturing traffic and also not be visible because it does not respond to probes.

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