Re: zenmap crash in NmapParser.py

[Daniel Miller <bonsaiviking () gmail com>]

On Fri, May 16, 2014 at 11:53 AM, Jiří Procházka <ojirio () gmail com> wrote:

> On Arch Linux, nmap 6.46 with pyxml 0.8.4-10 when finished scanning
> services:
>
> Version: 6.46
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/site-packages/zenmapGUI/ScanInterface.py",
> line 597, in verify_execution
>     self.load_from_command(scan)
>   File "/usr/lib/python2.7/site-packages/zenmapGUI/ScanInterface.py",
> line 613, in load_from_command
>     parsed.parse_file(command.get_xml_output_filename())
>   File "/usr/lib/python2.7/site-packages/zenmapCore/NmapParser.py", line
> 799, in parse_file
>     self.parse(f)
>   File "/usr/lib/python2.7/site-packages/zenmapCore/NmapParser.py", line
> 793, in parse
>     self.parser.parse(f)
>   File "/usr/lib/python2.7/site-packages/_xmlplus/sax/expatreader.py",
> line 109, in parse
>     xmlreader.IncrementalParser.parse(self, source)
>   File "/usr/lib/python2.7/site-packages/_xmlplus/sax/xmlreader.py",
> line 123, in parse
>     self.feed(buffer)
>   File "/usr/lib/python2.7/site-packages/_xmlplus/sax/expatreader.py",
> line 216, in feed
>     self._parser.Parse(data, isFinal)
>   File "/usr/lib/python2.7/site-packages/_xmlplus/sax/expatreader.py",
> line 312, in start_element
>     self._cont_handler.startElement(name, AttributesImpl(attrs))
>   File "/usr/lib/python2.7/site-packages/zenmapCore/NmapParser.py", line
> 953, in startElement
>     self._parse_nmaprun(attrs)
>   File "/usr/lib/python2.7/site-packages/zenmapCore/NmapParser.py", line
> 807, in _parse_nmaprun
>     if self._nmap_output is None and "nmap_output" in attrs:
>   File "/usr/lib/python2.7/site-packages/_xmlplus/sax/xmlreader.py",
> line 316, in __getitem__
>     return self._attrs[name]
> KeyError: 0
>
>
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Jiří, Chris, and Etienne,

Thank you for your bug reports. This crash is happening because you have
PyXML installed. Python 2's standard library provides XML support through
the xml library [1], but for legacy reasons if it detects PyXML installed,
it will import that instead [2]. The two codebases have diverged, since
PyXML has not been actively developed for over 10 years and has been
abandoned by its maintainers. Crashes of this sort are common with code
that was written for Python 2.4 (as PyXML was).

For now, your best option is to uninstall PyXML. I will continue to
research and see if there is a solution to prevent Python from importing it
if it is present. Your bug reports are appreciated.

Happy scanning,

Dan
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