Using apt-get with a proxy
How to install software on machines without internet access
It is not uncommon that you gain access to a machine inside an internal network that does not have internet access. Because of that, it is not that easy to install software on it and static binaries are not always doing the trick.
If you got access (sudo or root) to the target it is possible to let apt use your attacking machine as a proxy to download and install software.
Install Squid proxy
Firstly it is necessary to install squid on your local machine:
sudo apt install squid
Next, the config file has to be modified (needs sudo permissions):
sudo vim /etc/squid/squid.conf
There are several options you can adjust depending on your preferences:
- http_port: This sets the proxy port the victim machine can connect to; by default it is 3128.
- http_access deny all: This is the default option that won't let anybody connect to the proxy. Change it to
http_access allow all.
sudo systemctl start squid to start the proxy server.
A more in-depth guide on how to configure and set up squid can be found here.
Change the apt config
If not existent create the file
/etc/apt/apt.conf.d/proxy.conf and add the following two lines:
The next time you run apt on the victim machine it will use your local machine as a proxy and successfully download whatever you are trying to install.