trying to play with pyrit having problems

[wesmagyar]

I installed cuda following the excellent howto guide by pureh@te in the howto section and whenever i try to crack a wpa password or use most commands it errors out and i can not figure it out ive tried looking around and havnt found anything on it here is a copy of the output i have recieved

root@bt:~# pyrit -e _vc98002 -i /pentest/passwords/wordlists/wpa.txt -r hack-02.cap attack_passthrough
Pyrit 0.3.1-dev (svn r228) (C) 2008-2010 Lukas Lueg http://pyrit.googlecode.com
This code is distributed under the GNU General Public License v3+

Parsing file 'hack-02.cap' (1/1)...
Traceback (most recent call last):
  File "/usr/bin/pyrit", line 6, in <module>
    pyrit_cli.Pyrit_CLI().initFromArgv()
  File "/usr/lib/python2.5/site-packages/pyrit_cli.py", line 106, in initFromArgv
    func(self, **options)
  File "/usr/lib/python2.5/site-packages/pyrit_cli.py", line 143, in new_f
    f(*args, **kwds)
  File "/usr/lib/python2.5/site-packages/pyrit_cli.py", line 635, in attack_passthrough
    ap = self._fuzzyGetAP(self._getParser(capturefile), bssid, essid)
  File "/usr/lib/python2.5/site-packages/pyrit_cli.py", line 158, in _getParser
    parser.parse_file(capturefile)
  File "/usr/lib/python2.5/site-packages/cpyrit/pckttools.py", line 368, in parse_file
    self.parse_packet(pckt)
  File "/usr/lib/python2.5/site-packages/cpyrit/pckttools.py", line 381, in parse_packet
    self._add_ap(dot11_pckt.addr2, dot11_pckt)
  File "/usr/lib/python2.5/site-packages/cpyrit/pckttools.py", line 351, in _add_ap
    essid = self._find_ssid(pckt)
  File "/usr/lib/python2.5/site-packages/cpyrit/pckttools.py", line 343, in _find_ssid
    for elt_pckt in pckt.iterSubPackets(scapy.layers.dot11.Dot11Elt):
  File "/usr/lib/python2.5/site-packages/cpyrit/pckttools.py", line 87, in iterSubPackets
    elt = elt[cls:2]
  File "/usr/lib/python2.5/site-packages/scapy/packet.py", line 758, in __getitem__
    raise IndexError("Layer [%s] not found" % lname)
IndexError: Layer [Dot11Elt] not found

any help would be appreciated!
-Wes-

[purehate]

Try putting the essid in quotes like

pyrit -e " _vc98002" -i /pentest/passwords/wordlists/wpa.txt -r hack-02.cap attack_passthrough

Special chars are always a pain and need to be enclosed in " "

The only other thing is to make sure you cap file is good. I sometimes have problems with pyrit if there is to much data in the file, stripping it may help

Also make sure you are using bt4 final and that scapy2 is installed.