绑定壳和反向壳的区别

shell 是一个程序，它解释我们的命令并将写入的命令提供给操作系统。它充当用户和操作系统之间的接口。它从键盘获取输入并将其提供给操作系统，终端允许您键入命令并与 shell 交互。

一些流行的外壳：

简而言之，端口是可以建立连接的开口。

例如，访问 https://geeksforgeeks.org 之类的网站，将建立到 443 端口的连接，因为 HTTPS 和服务器使用 443 端口进行连接。端口是与 IP 地址关联的数字。

一些常用的端口是：

绑定外壳：

绑定外壳

绑定外壳是一种设置，其中远程控制台通过网络与其他计算机建立。在 Bind shell 中，攻击者在目标计算机上启动服务，攻击者可以连接到该服务。在绑定外壳中，攻击者可以连接到目标计算机并在目标计算机上执行命令。要启动绑定 shell，攻击者必须拥有受害者的 IP 地址才能访问目标计算机。

反向壳

反向外壳或回连是一种设置，攻击者必须首先在他的机器上启动服务器，而目标机器必须充当连接到攻击者服务的服务器的客户端。连接成功后，攻击者可以访问目标计算机的shell。

要启动反向 shell，攻击者无需知道受害者的 IP 地址即可访问目标计算机。

S.NO.	Bind Shell	Reverse Shell
1.	Bind Shells have the listener running on the target and the attacker connects to the listener in order to gain remote access to the target system.	In the reverse shell, the attacker has the listener running on his/her machine and the target connects to the attacker with a shell. So that attacker can access the target system.
2.	In Bind shell, the attacker finds an open port on the server/ target machine and then tries to bind his shell to that port.	In the reverse shell, the attacker opens his own port. So that victim can connect to that port for successful connection.
3.	The attacker must know the IP address of the victim before launching the Bind Shell.	The attacker doesn’t need to know the IP address of the victim, because the attacker is going to connect to our open port.
4.	In Bind shell, the listener is ON on the target machine and the attacker connects to it.	The Reverse shell is opposite of the Bind Shell, in the reverse shell, the listener is ON on the Attacker machine and the target machine connects to it.
5.	Bind Shell sometimes will fail, because modern firewalls don’t allow outsiders to connect to open ports.	Reverse Shell can bypass the firewall issues because this target machine tries to connect to the attacker, so the firewall doesn’t bother checking packets.