Hi there!
I have a simple view with a form (with GET method), in order to allow my
visitors to do some search.
The controller/function that processes the get is this:
def search():
session.forget(response)
query = "tsv @@ plainto_tsquery('%s')" % request.vars.q
total = db.executesql('SELECT COUNT(*) FROM contenido WHERE %s' % query)
results = db(query).select()
return dict(results=results)
As you can see, I use a tsv field to implement postgresql full text search.
The funcion is working ok.
But *yesterday, I had an attack attempt*, or something like that. In just
one hour, some robot sent a lot of queries to that URL, putting "garbage"
in the "q" parameter.
How did I notice that? Well, *in just one hour around 500 error tickets
were created* in the /errors folder. All the errors have this form:
- unterminated quoted string at or near
"'../../../../../../../../../../windows/win.ini" LINE 1: ...tsv @@
plainto_tsquery('../../../... ^
- unterminated quoted string at or near
"'1some_inexistent_file_with_long_name" LINE 1: ...tsv @@
plainto_tsquery('1some_ine... ^
- unterminated quoted string at or near
"'../../../../../../../../../../etc/passwd" LINE 1: ...tsv @@
plainto_tsquery('../../../... ^
- invalid byte sequence for encoding "UTF8": 0xf0 0x20 0x20 0xf0
- invalid byte sequence for encoding "UTF8": 0xf6 0x22 0x20 0x6f
- invalid byte sequence for encoding "UTF8": 0xa0
*I've already tried to use the search form with those query strings, but I
cannot reproduce the error.*
*How could the robot send those bytes to the query function?*
Of course I can add a try: except: block, however I was wondering how to
reproduce the error, I wasn't able to do it.
Any help will be appreciated.
Thanks in advance!
Regards,
Lisandro.
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