MedSec: Network and Pentest Tool for Linux Systems

MedSec is a network and pentest utility that I developed so that I could perform different kinds of task using the same suite, instead of jumping from one tool to another.

Currently, this script can perform a good variety of tasks such as:

• Port scan, including SYN, TCP, UDP, ACK, comprehensive scan;
• Host discovery (scan for up devices on a local network);
• MAC address detection (get MAC address of a host IP on a local network);
• Banner grabbing;
• DNS checks with geolocation information;
• Subdomain enumeration;
• Vulnerability reconnaissance;
• ifconfig (beta);
• ping;
• traceroute (beta);
• IP spoofing;
• Packet sniffing;
• Deauth attack.

Other features are still being implemented. Future implementations may include WAF (web application firewall) detection, DNS enumeration, static code analysis, traffic analysis, ARP poisoning, MAC flooding, ping of death, network disassociation attack (not deauth attack), OSINT, exploits, some automated tasks, Windows support and others.

Installation

Note that currently, this script can only run well on Linux. If you try it in on Windows or macOS, it may run, but numerous errors will appear. It will have Windows support anytime in the future.

Linux

To install the necessary packages so that the script can run withouth any problems simply run the setup.sh script with root privileges. Currently, this installation script is only supported on Debian, Red Hat and Arch based distros that has the apt, dnf and pacman package manager respectively (Ubuntu, Kali Linux, Parrot OS, Debian, Pop!_OS, Linux Mint, Deepin, Zorin OS, MX Linux, Elementary OS, Fedora, CentOS, Red Hat Enterprise Linux, Rocky Linux, AlmaLinux, Oracle Linux, ClearOS, Arch, Black Arch, Manjaro etc). On most systems, to install medsec simply run the following commands:

git clone https://github.com/medpaf/medsec.git
cd medsec
sudo . setup.sh

Then, simply follow the instructions.

However, if you are using any other Linux distro with a different package manager, please install the packages manually using your distro’s package manager. Depending on the specific distro used, some of the required packages to run this script might be already installed on your machine. The necessary packages are:

• nmap (using your system’s package manager)
• traceroute (using your system’s package manager)
• sockets (using pip3)
• ipaddress (using pip3)
• python-nmap (using pip3)
• colorama (using pip3)
• ipinfo (using pip3)
• scapy (using pip3)
• shodan (using pip3)

After the installation, to run the program, simply navigate to the project’s directory and run the medsec.py file using python. Running the script as root is recommended for better performance and to avoid permission errors. The used command is the following:

sudo python3 medsec.py

How to use

Scanning ports

Scanning ports helps detect potential security breaches by identifying the hosts connected to your network and the services running.

Multiple scan types are supported, including SYN (-scansyn), TCP (-scantcp), UDP (-scanudp), ACK (-scanack) and comprehensive scan (-scan).

-scan -host [HOST(s)]

-scan -host [HOST(s)] -p [PORT(s)]

-scan -host [HOST(s)] -prange [START PORT] [END PORT]

-scan -iprange [START IP] [END IP] -p [PORT(s)]

-scan -iprange [START IP] [END IP] -prange [START PORT] [END PORT]

After this scan, it is possible to see that both 22 (SSH) and 80 (HTTP) ports are open.

Host discovery

To look for current up devices on a given network type the following command:

-scanlan

Then type the network you want to scan.

MAC address detection

To get a MAC address of one or more live hosts on the LAN, use the command:

-getmac -host [HOST(s) IP]

Banner grabbing

Banner grabbing is a reconnaissance technique that retrieves a software banner information. This banner usually contains important information about a network service, including but not limited to, it’s software name and version. FTP, Web, SSH, and SMTP servers often expose vital information about the software they are running in their banner.

A banner attack usually starts off with a enumeration scan to find open ports. Once you identified a service you want to target, you can send specific packets and inspect the traffic for the specified information.

To perform banner grabbing, depending on your specific needs, type one of the following commands:

-grab -host [HOST(s)] -p [PORT(s)]

-grab -iprange [START IP] [END IP] -prange [START PORT] [END PORT]

-grab -host [HOST(s)] -prange [START PORT] [END PORT]

-grab -iprange [START IP] [END IP] -p [PORT(s)]

DNS checks

This feature is similar to the well known nslookup command used on UNIX systems. If you want to do a DNS check, type the following:

-ns [HOST(s)]

Subdomain enumeration

Subdomain enumeration is the process of finding valid sub-domains for one or more domain.

Sub-domain enumeration can reveal a lot of domains/sub-domains that are in scope of a security assessment which in turn increases the chances of finding vulnerabilities.

If you wish to look for common subdomains of a domain, simply type:

-sdenum [DOMAIN]

Vulnerability reconnaissance

To scan one or more hosts for vulnerabilities use the following command:

-vulnscan -host [HOST(s)]

ifconfig

If you want to display your system’s current TCP/IP network configuration, type the following command:

-ifconfig

ping

To send ICMP packets to one or more hosts to check connectivity, simply type:

-ping [HOST(s)]

traceroute

To diagnose route paths and measure transit delays, use the -traceroute command:

-traceroute [HOST]

IP spoofing

The objective of IP spoofing is to modify the correct source IP address so that the system to which a packet is directed cannot correctly identify the sender.

Note that this command only works on machines with unpached vulnerabilities. To performe IP spoofing on a host’s specific port, use the following command:

-ipspoof -source [SOURCE IP] [SOURCE PORT] -target [TARGET IP] [TARGET PORT]

If you want to use a random source IP, type the following command:

-ipspoof -source r [SOURCE PORT] -target [TARGET IP] [TARGET PORT]

You can also use a random source port:

-ipspoof -source [SOURCE IP] r -target [TARGET IP] [TARGET PORT]

Packet sniffing

To perform packet sniffing, type:

-sniff

Deauth attack

A deauth attack is a type of wireless attack that targets communication between a router and one or more devices connected to that router. Effectively forcing the target machine to disconnect from the access point.

To do this attack, use the following command:

-deauth -target [TARGET MAC] -gateway [GATEWAY MAC] -iface [INTERFACE]

If you plan to attack all clients in a gateway, type:

-deauth -target a -gateway [GATEWAY MAC] -iface [INTERFACE]

After the command issued on the screenshot above, all the devices connected to that access point were disconnected and unable to reconnect while this script was running.