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Thread: Problems with cracking WEP

  1. #1
    Just burned his ISO
    Join Date
    Aug 2008
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    2

    Default Problems with cracking WEP

    Handshake(-1) gets fine but when i use chopchop(-4) i get his message:

    The AP appears to drop packets shorter than 37 bytes.
    Enabling standard workaround: IP header re-creation.
    This doesn't look like an IP packet, try another one.

    Warning: ICV checksum verification FAILED! Trying workaround.


    The AP appears to drop packets shorter than 40 bytes.
    Enabling standard workaround: IP header re-creation.
    This doesn't look like an IP packet, try another one.

    Workaround couldn't fix ICV checksum.
    Packet is most likely invalid/useless
    Try another one.

    And when i use Fragmentation Attack(-5):
    Saving chosen packet in replay_src-1015-184714.cap
    18:47:18 Data packet found!
    18:47:18 Sending fragmented packet
    18:47:20 No answer, repeating...
    18:47:20 Trying a LLC NULL packet
    18:47:20 Sending fragmented packet
    18:47:22 No answer, repeating...
    18:47:22 Sending fragmented packet
    18:47:23 No answer, repeating...
    18:47:23 Trying a LLC NULL packet
    18:47:23 Sending fragmented packet
    18:47:25 No answer, repeating...
    18:47:25 Sending fragmented packet
    18:47:27 No answer, repeating...
    18:47:27 Trying a LLC NULL packet
    18:47:27 Sending fragmented packet
    18:47:28 No answer, repeating...
    18:47:28 Sending fragmented packet
    18:47:30 No answer, repeating...
    18:47:30 Trying a LLC NULL packet
    18:47:30 Sending fragmented packet
    18:47:32 No answer, repeating...
    18:47:32 Sending fragmented packet
    18:47:33 No answer, repeating...
    18:47:33 Trying a LLC NULL packet
    18:47:33 Sending fragmented packet
    18:47:35 No answer, repeating...
    18:47:35 Sending fragmented packet
    18:47:36 No answer, repeating...
    18:47:36 Still nothing, trying another packet..

    What is the problem? I have cracked wep before with success. Is mac locked to AP or what? I have broadcom drivers with pcmcia card in BT3.

  2. #2
    Good friend of the forums
    Join Date
    Jun 2008
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    425

    Default

    I tryed about once to do it, but i think, you need to auth to the ap, and or get a nother computer witha wireless card to be auth and then de-auth them.

    Sorry i wasn't much help

  3. #3
    Just burned his ISO
    Join Date
    Feb 2009
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    1

    Default

    Yes I am having the same problem you described above working against one of my Billion combo router/APs. I have been able to use the fragmented attack with great success otherwise. I have not tried the chop-chop attack though.

    I am using and rtl8187 wifi usb and BT3.

    Any ideas?

  4. #4
    Just burned his ISO LMNOParis's Avatar
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    Mar 2010
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    23

    Default

    I have run into that issue. I'm guessing the AP isn't vulnerable against that attack. If someone does have a way around this I'd appreciate some info as well.

  5. #5
    Senior Member
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    Default

    Quote Originally Posted by ecu971 View Post
    Handshake(-1) gets fine but when i use chopchop(-4) i get his message:
    ...
    What is the problem? I have cracked wep before with success. Is mac locked to AP or what? I have broadcom drivers with pcmcia card in BT3.
    If you are able to successfully fake authenticate the problem is not a MAC filter stopping your attack. Although this is something you should be aware of prior to the attack as the AP surely is your own?

    As already pointed out in this thread, not all APs are vulnerable to these attacks.
    -Monkeys are like nature's humans.

  6. #6
    Just burned his ISO BlownCPU's Avatar
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    Jan 2009
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    Default

    If the AP is not willing to play you could always attack the PC called "Client Attack"
    Check out the aircrack-ng web pages, it's all there.

    PC ether cards are very basic in their security and as long as the PC is on you can gather packets in the same way.

    Have a read and come back if you get stuck.

    Blown CPU

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