Ethical hacking and countermeasures - phần 27 ppsx

Ethical H ackin g

Ve rsio n 5

Module 24

Covert Hacking

EC-Council

Insider Attacks

¿ Insider attacks are attacks initiated from inside-out

¿ Inside-Out attacks try to initiate network connections from

the trusted (corporate) to the untrusted (Internet) network

¿ These techniques are used to evade firewall filters

Outsider Insider

EC-Council

What is Covert Channel?

¿A Covert channel is a mechanism for sending and receiving

information data between machines without alerting any

firewalls and IDS’s on the network

¿The technique derives its stealthy nature by virtue of the

fact that it sends traffic through ports that most firewalls

will permit through

Network Firewall Internet

Attacker