🧠 Task Description

Challenge Name: Network-Configuration
Platform: pwn.college
Goal: Configure the network interface on your machine so that a remote host (10.0.0.2) can communicate with another remote host (10.0.0.3) on port 31337.

🔍 Reconnaissance

We begin by inspecting the challenge script:

root@ip-10-0-0-1:~# cat /challenge/run

Key points:

  • A ClientHost (10.0.0.2) continuously tries to send the flag to 10.0.0.3 on port 31337.
  • But 10.0.0.3 is not yet part of the network.
  • The current network consists only of:
    • 10.0.0.1 (us)
    • 10.0.0.2 (client trying to send data) We must:
  • Assign 10.0.0.3 to our own interface.

  • Listen on port 31337.

Exploitation: Configuring the Interface

Step 1: Assign IP 10.0.0.3 to our interface (eth0)

ip addr add 10.0.0.3/24 dev eth0

Step 2: Start a listener on port 31337

nc -l 31337

We successfully receive the flag:

pwn.college{YmPg1kNfS-SrduJdfqnUSDnzRGc.QX1YzMzwSM0IzMyEzW}

Flag

pwn.college{YmPg1kNfS-SrduJdfqnUSDnzRGc.QX1YzMzwSM0IzMyEzW}