Working with bind and reverse shells
In a bind shell scenario, let's imagine your target is on a public network such as the internet and has a public IP address, while your attacker machine is behind a firewall. Traffic originating from the internet that goes to an internal network is blocked by the firewall by default. Firewalls are configured to block traffic that originates from a less trusted network zone to a more trusted network zone. However, if you want to connect to the target, you will need to establish a connection from a more trusted network zone, such as the internal network, to a less trusted network zone.
If the target system is running a listener, it can be configured to be bound to the Windows Command Prompt or Linux Terminal shell with the target's IP address and a unique service port number. This will allow the attacker machine to connect to the target via its public IP address and port number, and obtain a remote bind shell on the target system.
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