Vpn-jantit-pptp

The challenge provides a PCAP file containing traffic from a PPTP VPN connection. PPTP is an older VPN protocol known for security vulnerabilities, particularly in its authentication phase, which often uses MS-CHAPv2. Step-by-Step Analysis

: The client sends its username and a hashed response (NT-Response). Success/Failure : Confirms if the credentials were correct.

Open the file in Wireshark. Filter the traffic using pptp or gre (Generic Routing Encapsulation). You will see the control channel setup (TCP port 1723) followed by GRE packets carrying the encapsulated PPP data. vpn-jantit-pptp

: The 16-byte random value from the server.

: The 24-byte hashed response sent by the client. The challenge provides a PCAP file containing traffic

PPTP MS-CHAPv2 hashes can be cracked using tools like Hashcat or John the Ripper .

To crack the password, you need to extract the following fields from the "Response" packet: Success/Failure : Confirms if the credentials were correct

This write-up covers the challenge, typically found in CTF (Capture The Flag) competitions or network security labs . The goal is to analyze a network capture file (PCAP) to recover credentials used in a Point-to-Point Tunneling Protocol (PPTP) session. Challenge Overview