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AttributeError: 'NullTypeNode' object has no attribute 'find_end_of_stream'

Aperta
  • Qualcosa non va?
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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
35/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Ferma
Stack tecnologico
python
Ambito
backend

Direzione di ricerca

Start with the traceback in Evtx/Nodes.py, especially _children, children, and find_end_of_stream; the failure occurs while rendering a record through Evtx/Views.py. Reproduce with the reported Windows Server 2012 R2 EVTX file and the evtx_dump.py command, then trace why a NullTypeNode lacks find_end_of_stream. Done means the file parses without this AttributeError; the report does not name a test or provide the sample file.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

bug

Hi,

When attempting to parse an evtx file as gathered by a collector on a Win server 2012 R2 box ; I get the following errors:

 ./evtx_dump.py Archive-ForwardedEvents-2017-07-19-09-54-122.evtx

<?xml version="1.1" encoding="utf-8" standalone="yes" ?>

<Events>
Traceback (most recent call last):
  File "./evtx_dump.py", line 46, in <module>
    main()
  File "./evtx_dump.py", line 41, in main
    print(record.xml())
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Evtx.py", line 481, in xml
    return e_views.evtx_record_xml_view(self)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Views.py", line 204, in evtx_record_xml_view
    return render_root_node(record.root())
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Views.py", line 182, in render_root_node
    for sub in root_node.substitutions():
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/BinaryParser.py", line 64, in __call__
    cache[key] = self.func(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 1001, in substitutions
    ofs = self.tag_and_children_length()
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 962, in tag_and_children_length
    for child in self.children():
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/BinaryParser.py", line 64, in __call__
    cache[key] = self.func(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 952, in children
    return self._children(end_tokens=[SYSTEM_TOKENS.EndOfStreamToken])
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 159, in _children
    ofs += child.length()
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/BinaryParser.py", line 64, in __call__
    cache[key] = self.func(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 177, in length
    for child in self.children():
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/BinaryParser.py", line 64, in __call__
    cache[key] = self.func(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 334, in children
    SYSTEM_TOKENS.CloseEmptyElementToken])
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 162, in _children
    if child.find_end_of_stream():
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/BinaryParser.py", line 64, in __call__
    cache[key] = self.func(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.0-py2.7.egg/Evtx/Nodes.py", line 186, in find_end_of_stream
    ret = child.find_end_of_stream()
AttributeError: 'NullTypeNode' object has no attribute 'find_end_of_stream'

running Python 2.7.9 on Debian 8. I installed the current version of python-evtx using the setup.py utility from the github download. Please let me know if you need any more details.

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